Analytische Qualitätssicherung Baden-Württemberg
|
|
- Clarissa Lynch
- 6 years ago
- Views:
Transcription
1 Analytische Qualitätssicherung Baden-Württemberg Proficiency Test 7/16 - Ions in waste water - ammonium-nitrogen, nitrate-nitrogen, nitrite-nitrogen, total phosphorous, total cyanide, cyanide (week acid dissociable), chromium (VI) provided by AQS Baden-Württemberg at Institute for Sanitary Engineering, Water Quality and Solid Waste Management, University of Stuttgart Bandtäle 2, Stuttgart-Büsnau, Germany on behalf of the Ministry of the Environment, Climate Protection and the Energy Sector Baden-Württemberg Stuttgart, in February 2017
2 Responsibilities: Scientific director AQS: Dr.-Ing. Dipl.-Chem. Michael Koch PT manager: Dr.-Ing. Frank Baumeister AQS Baden-Württemberg at Institute of Sanitary Engineering, Water Quality and Solid Waste Management at University of Stuttgart Bandtäle Stuttgart-Büsnau Germany Tel.: +49 (0)711 / Fax: +49 (0)711 / info@aqsbw.de
3 PT 7/16 LIST OF CONTENTS 1. GENERAL PT DESIGN SAMPLE PREPARATION SAMPLE DISTRIBUTION ANALYTICAL METHODS SUBMISSION OF RESULTS EVALUATION AND ASSESSMENT PROCEDURE EVALUATION EXPLANATION OF APPENDIX A EXPLANATION OF APPENDIX B EXPLANATION OF APPENDIX C MEASUREMENT UNCERTAINTY TRACEABLE REFERENCE VALUES INTERNET Appendix A Ammonium-nitrogen A-1 Nitrate-nitrogen A-11 Nitrite-nitrogen A-21 Total phosphorous A-31 Cyanide (week acid dissociable) A-41 Total cyanide A-51 Chromium (VI) A-61 Appendix B Appendix C Ammonium-nitrogen C-1 Nitrate- nitrogen C-28 Nitrite- nitrogen C-56 Total phosphorous C-85 Cyanide (week acid dissociable) C-112 Total cyanide C-139 Chromium (VI) C-166
4 PT 7/16 page 1 1. General This PT was provided by AQS Baden-Württemberg in the framework of the nationwide conducted waste water PT scheme in Germany. This PT scheme is based on the requirements of the German Working Group on water issues of the Federal States and the Federal Government (LAWA), which fixed the way of doing PTs in the regulated environmental sector in its AQS-leaflet A-3 for the analysis of water, waste water and sludge. These PTs are conducted together with several PT providers nationwide in Germany in a harmonised way. The PT was executed and evaluated according to the requirements of DIN A45 and ISO/TS PT design Each participant received the following samples: 3 samples for the determination of ammonium-nitrogen, nitrate-nitrogen in 1000-ml-glass bottles with screw cap. Preservation by cooling. 3 samples for the determination of nitrite-nitrogen in 100-ml-glass bottles with screw cap. Preservation by cooling. 3 samples for the determination of total phosphorous in 500-ml-plastic bottles with screw cap. Preservation by acidification with HNO 3 (ph ca. 2,1) and cooling. 3 samples for the determination of cyanide (weak acid dissociable) and total cyanide in 500-ml-glass bottles with screw cap. Preservation by alkalinising with NaOH (ph ca. 11,4) and cooling. 3 samples for the determination of chromium (VI) in 250-ml-plastic bottles with screw cap. Preservation by alkalinising with NaOH (ph ca. 9) and cooling. 9 different concentration levels/batches were produced. The concentration levels were randomly allocated to the participants. It was ensured that each participant received one concentration level from the lower concentration range (level 1-3), one level from the middle concentration range (level 3-6) and one level from the higher concentration range (level 7-9). 3. Sample preparation The samples for the determination of ammonium-nitrogen, nitrate-nitrogen, nitritenitrogen, total phosphorous, total cyanide and cyanide (week acid dissociable) were based on a real waste water (effluent of the microsieve of the waste water treatment plant Stuttgart-Büsnau). The waste water was kept one day in an intermediate bulk container for sedimentation. For the preparation of the samples, the waste water was filtered by using 5 µm and 1 µm filter cartridges to eliminate particles. To reduce germs, the waste water was irradiated with ultraviolet light and was pasteurised at 80 C in a stainless steel tank overnight. During pasteurisation the waste water was aerated with a mixture of nitrogen and carbon dioxide to prevent degassing of carbon dioxide followed by precipitation of calcium carbonate. For the cyanide parameters the waste water was additionally treated to eliminate carbon dioxide after pasteurisation. The special treatment was necessary to prevent chalk deposition in the batches. Therefore the waste water was acidified with sulphuric acid (ph < 4) and were aerated with nitrogen to remove all carbonic acid spe-
5 PT 7/16 page 2 cies (decarbonisation). Afterwards the ph of the matrix was adjusted to a value of 11,4 directly before producing the batches. The samples for the determination of chromium (VI) were based on drinking water as matrix. The drinking water was filtered with 5 µm and 1 µm filter cartridges and irradiated with ultraviolet light before use. For the preparation of the samples, the matrices were spiked with stock solutions. The concentrations covered waste water relevant ranges. The samples were cooled directly after preparation. The samples were dispatched with freezer packs added to the packages. 4. Sample distribution The samples were distributed on 07 November 2016 with a post express service (TNT).
6 PT 7/16 page 3 5. Analytical methods The participants were restricted to use analytical methods according to the requirements of the Technical Module Water from the German Working group on water issues of the Federal States and the Federal Government (LAWA) from 13 November parameter NH 4 -N NO 3 -N NO 2 -N P total method DIN EN ISO : (E23) DIN EN ISO : (E23) DIN E 5 : DIN ISO : (D49) DIN EN ISO : (D20) DIN EN ISO : (D20) DIN EN ISO : (D28) DIN D 9 : DIN D 9-2 / 9-3 : DIN ISO : DIN EN : (D10) DIN EN ISO : (D20) DIN EN ISO : (D20) DIN EN ISO : (D28) DIN EN ISO : (D49) DIN EN ISO 6878 : (D11) DIN EN ISO : (E22) DIN EN ISO : (E22) DIN EN ISO : (E29) DIN EN 1189: , Ziffer 6 (D11) DIN EN 1189: , Ziffer 7 (D11) DIN EN ISO : (D45) DIN EN ISO : (D46) CN (wad) DIN D13-2 : DIN EN ISO : (D6) DIN EN ISO : (D2) DIN EN ISO : (D3) CN total DIN D13-1 : DIN EN ISO : (D6) DIN EN ISO : (D2) DIN EN ISO : (D3) Cr (VI) DIN D 24 : DIN EN ISO : (D22), section 6 (dissolved chromate) DIN EN ISO : (D41)
7 PT 7/16 page 4 Following limits of quantification were required: parameter limit of quantification [mg/l] ammonium-nitrogen 1,0 nitrate-nitrogen 2,0 nitrite-nitrogen 0,05 total phosphorous 0,25 total cyanide 0,1 cyanide (wad) 0,05 chromium (VI) 0,05 The samples had to be analysed in duplicate over the complete method (sample preparation and measurement). The participants were asked to submit the results as average values in mg/l with three significant digits. 6. Submission of results The deadline for the submission of results was on 25 November Evaluation and assessment procedure The values were assessed according to the tolerance limits determined in the assessment of 43. LÜRV. In 43. LÜRV the assigned value x pt was calculated as consensus mean using the Hampel estimator. The standard deviation for proficiency assessment σ pt was taken from the Q-method for the calculation of z U -scores according to DIN A45 (chapter 10.4) or ISO/TS respectively. The standard deviation for proficiency assessment σ pt was taken from the variance function. σ pt was limited as follows: parameter limits for σ pt in % lower limit upper limit NH 4 -N, NO 3 -N, NO 2 -N, total phosphorous 5 10 cyanide (wad) cyanide (total) Chromium (VI) 5 15 A z-score for a result x was calculated for each measurement result derived from the assigned value x pt and the standard deviation for proficiency assessment σ pt : z = x σ x pt pt The z-score was modified to a z U -score with a correction factor for proficiency assessment (as described in the above mentioned standards). The tolerance limits were defined as Iz U I=2.0.
8 PT 7/16 page 5 According to ISO (2015) the single results were assessed as follows: z u < z u < 3.0 z u 3.0 successful (s) questionable (q) unsatisfactory (u) There was no overall assessment of the proficiency test round, but the single parameters were assessed. A parameter was assessed as successful, if more than half of the values were correctly determined (2 out of 3 values are within the tolerance limits). Not successful were: 1) Values which were not determined (if the other samples of this parameters were analysed), 2) Values, which were indicated with lower than limit of quantification, 3) Values, which were subcontracted, 4) Values, which were submitted after the deadline of submission of results. 8. Evaluation Number of participants: 141 Number of reported values: 2667 Number of accepted values: 2379 (89,2%) 1 laboratory reported no results In the following figure the successful and not successful laboratories for each parameter are illustrated.
9 PT 7/16 page 6 9. Explanation of Appendix A Appendix A contains for each parameter - parameter tables - a figure of participants means versus the spiked amount for the determination of the recovery rate and the matrix content - a figure of the relative standard deviations versus the concentrations - a figure of the tolerance limits in the PT versus the concentrations - the frequency of application of analytical methods - the method specific evaluation - a comparison of mean and reference values for each concentration level - a comparison of the relative standard deviations of the different methods - the statistical characteristics of the method specific evaluation - a tabular comparison of the means with the reference values and their uncertainties Parameter tables In these tables the following values for each concentration level are listed: assigned value expanded uncertainty of the assigned value in %, calculated according to ISO using the formula rel. standard deviation U = number of values standard deviation, calculated using robust statistical method standard deviation for proficiency assessment for the calculation of z U -scores rel. standard deviation for proficiency assessment tolerance limits above and below permitted deviations above and below in % number of values in this level number of not satisfactory values below and above the assigned value and the percentage of these values in total. Determination of recovery rate In the diagrams of the assigned values versus the spiked amount of analyte a linear regression line was calculated using a generalized least square regression which takes into account the uncertainties of the values in both directions. From these values the recovery rate for each parameter was determined (see diagrams). The slope of the line indicates the average recovery rate. The diagrams also contain the expanded uncertainty (k=2) of the mass values and the assigned values. Relative standard deviations and tolerance limits The diagrams for the relative standard deviation vs. the assigned value show the concentration dependency of the standard deviation and the tolerance limits in percent. The relative standard deviations calculated from participants data are the stars connected by an interrupted line, the rel. standard deviation taken from the variance function (and sometimes limited by the upper or lower limit) are given by squares, connected by a continuous line.
10 PT 7/16 page 7 Method specific evaluation For each parameter the methods used by the participants are shown in a diagram. In a second diagram for each method with a frequency of more than 5 %, values are sorted in 5 categories: too low results with z U -score < -2 low results with 2 z U -score < 1 correct results with 1 z U -score +1 high results with +1 < z U -score +2 too high results with z U -score > +2 Comparison of means and reference values for each concentration level Finally the mean value calculated from all results (used as assigned value) is compared with mean values calculated for all methods separately (in this case using the Hampel estimator described in ISO/TS 20612). Mean values were calculated only, if more than 7 results were within a z-score-range of ± 2. The means are reported with their expanded uncertainty calculated according to ISO Explanation of Appendix B Participants were asked to report expanded uncertainties of their results on a voluntary basis. In this diagram for each parameter the reported uncertainties for all concentration levels with the reproducibility standard deviation (horizontal line) are displayed. Values which deviate from the reproducibility standard deviation with a factor more than 2 are usually not realistic. 11. Explanation of Appendix C In the last part of the report, for all concentration levels the results of all participants are illustrated. Confidentiality of participants is ensured by using lab codes. The lab codes were sent to participants with the certificates. In detail Appendix C contains: - a table with all data - figures with o all reported results o all z U -scores o all reported expanded uncertainties o all ζ scores Table with all data The assigned value with the expanded uncertainty and the tolerance limits for the concentration level is illustrated in the table. For each participant the following data are given: lab code reported result measurement uncertainty of the value (if reported) ζ-score for this value, calculated with the following formula ζ = x x pt 2 2 ulab + ux pt, with x x pt = difference from the measured value and the assigned value u lab = standard uncertainty of the value, reported by the participant
11 PT 7/16 page 8 u pt x = standard uncertainty of the assigned value z U -score for proficiency assessment assessment of the value according to its z-score Meaning of ζ-scores: The assessment of ζ-scores is similar to that of z-scores. If the data are normally distributed and the uncertainties are well estimated, ζ-scores will lie between -2 and +2 with a probability of around 95 %. ζ-scores are mainly influenced by the measurement uncertainties reported by the laboratory. Therefore ζ-scores are usually not appropriate for the assessment of the reported results, unless the reported measurement uncertainty is checked for fitnessfor-purpose. Therefore we do not use the ζ-scores for the assessment of the laboratories. Nevertheless ζ-scores are appropriate to check the plausibility of the reported measurement uncertainty: If the z-score of a result is within the tolerance limit and the ζ-score is outside, then the measurement uncertainty is underestimated. If the z-score is outside the tolerance limits and the absolute value of the ζ-score is lower than two, then the requirements of the proficiency test were stronger compared with the reported measurement uncertainty. Diagrams of uncertainty data In the first figure for all lab codes the measurement uncertainty (together with the reproducibility standard deviation) is illustrated. The second figure shows the associated ζ-scores. 12. Measurement uncertainty 59 (42,4%) out of 139 laboratories with valid values reported measurement uncertainties. In total 1070 (41,3%) out of 2589 valid values were given with the measurement uncertainty. The following table displays the number of values with measurement uncertainty against the accreditation status. Accreditation status of the values Number of values Number of values with measurement uncertainty accredited (43,7%) not accredited (45,4%) not specified (27,9%) We would like to put emphasis on the fact that reporting of measurement uncertainties in our PT scheme is absolutely voluntary. The only objective is to help all participants to reasonably handle measurement uncertainties and their estimation. The diagrams show that the spread of reported uncertainties is vast, from unrealistic low values up to very high. A plausibility check using reproducibility standard deviations of the PT round could be helpful here. If measurement uncertainties are underestimated values assessed as satisfactory in the PT ( z U 2), will have a large ζ-score. ζ > 2 means that the own requirements (defined in terms of estimated uncertainty) are not fulfilled. 156 (16%) of the 978 values reported with uncertainties and having a z U -score z U 2.0 had a ζ-score > 2.0. This means that the requirements of the PT scheme have been fulfilled, but not the own requirements, the uncertainty is underestimated.
12 PT 7/16 page Traceable reference values Traceability of analytical results to national and international references is of increasing importance in all laboratories. This is not easy to realise for chemical analyses and often can only be done by analysing certified reference materials. But availability of these reference materials in the water sector is very limited. Therefore we try to provide reference values for the proficiency test samples, traceable to national and international references. Since our PT samples without exception are spiked, real water samples, reference values can be calculated from the sum of matrix content and spiked amount of analyte. For both summands traceable values and their uncertainty have to be determined. It is assumed that no unrecognised systematic deviations occurred during sample preparation and dispatch and that all uncertainty components were discovered. Determination of the spiked amount and its uncertainty All spiking of samples was controlled gravimetrically. Conversion to concentration was done by measuring the density of the resulting samples using a pycnometer. This procedure allows the preparation of a complete uncertainty budget. The first step is the specification of the measurand with a formula. This shows the links between the result and all influence quantities for the parameter. c lot = ( m m ) ( m m ) P s _ ss, b s _ ss, t ss _ lot, b ss _ lot, t ( m m ) m m ) K ss, b ss, t ( lot, b lot, t F ρ lot with: c lot m s_ss,b m s_ss,t m ss_lot,b m ss_lot,t ρ lot m ss,b m ss,t m lot,b m lot,t P F K concentration of the analyte in the lot resulting from the spike in g/l mass of the substance added for preparation of the stock solution in g (gross weight of the vessel) mass of the substance added for preparation of the stock solution in g (tare weight of the vessel) mass of the stock solution into the lot in g (gross weight of the vessel) mass of the stock solution into the lot in g (tare weight of the vessel) density of the lot in g/l total mass of the stock solution in g (gross weight of the vessel) total mass of the stock solution in g (tare weight of the vessel) total mass of the lot in g (gross weight of the vessel) total mass of the lot in g (tare weight of the vessel) purity of the chemical conversion factor buoyancy correction Based on this formula the uncertainty budget can be prepared and all components can be quantified. The following figure shows the distribution of the contributions for the parameter ammonium-nitrogen. The main contribution results from the purity of ammonium-sulphate. According to the certificate of analysis, the purity was 99,8% and we estimated the uncertainty estimated to be 0,1% as rectangular distribution.
13 PT 7/16 page 10 All used balances are proofed annually by an accredited calibration laboratory and for each balance a calibration certificate is provided. The uncertainties of the weighings are taken from these certificates. The determination of the density was also made using weighings (of the pycnometer). Temperature measurement was made with a calibrated thermometer. With all these uncertainty components the combined uncertainty, as described in the EURACHEM/CITAC-Guide Quantifying Uncertainty in Analytical Measurement, was calculated using the sensitivity coefficients determined by partial derivation of the formula to the respective influence quantities. So traceability was assured by using calibrated balances and thermometers. Determination of the matrix content Because the same matrix was used for preparation of all samples, the matrix content could be calculated from the mean values of the participants and the spiked amounts in a standard-addition-like way 1,2. The uncertainties of the spiked amounts were known from the uncertainty budgets. The expanded uncertainties of the mean values of participants result were calculated according to ISO (Statistical Methods for Use in Proficiency Testing by Interlaboratory Comparisons) as u mean = 2 1, 25 s R n 1 Rienitz, O., Schiel, D., Güttler, B., Koch, M., Borchers, U.: A convenient and economic approach to achieve SI-traceable reference values to be used in drinking-water interlaboratory comparisons. Accred Qual Assur (2007) 12: Koch, M., Baumeister, F.: Traceable reference values for routine drinking water proficiency testing: first experiences. Accred Qual Assur (2008) 13:
14 PT 7/16 page 11 with: s R reproducibility standard deviation n number of data for this level 2 coverage factor for the expanded uncertainty 1,25 correction factor (according to ISO to be used for robust methods) The content of the matrix can be derived from a linear regression of means vs. spiked amounts. Since uncertainties of all data points were available for x- as well as y-direction a generalised least square regression was used as described in DIN EN The computer program LIN_LEAST (from BAM) was used for this purpose. With this method a value for matrix and its uncertainty are obtained. Because of statistical variation of the input values the calculated matrix content might result in a negative value. In those cases the matrix content is set to zero. The lower end of the uncertainty range of the matrix content also might be negative. Therefore the expanded uncertainty of the matrix content was set to the matrix content itself in this case. The matrix content is not directly traceable to national or international references, but it does not considerably compromise the traceability of the final content due to its comparably low contribution. 14. Internet The report is available on the following webpage:
15 1,62 2,05 1,63 1,86 1,27 1,62 1,24 1,64 1,72 Page A-1 of A-68
16 Page A-2 of A-68
17 Page A-3 of A-68
18 Page A-4 of A-68
19 Page A-5 of A-68
20 Page A-6 of A-68
21 Page A-7 of A-68
22 Page A-8 of A-68
23 Page A-9 of A-68
24 Page A-10 of A-68
25 0,92 1,23 1,16 1,34 1,23 1,34 1,12 1,27 1,15 Page A-11 of A-68
26 Page A-12 of A-68
27 Page A-13 of A-68
28 Page A-14 of A-68
29 Page A-15 of A-68
30 Page A-16 of A-68
31 Page A-17 of A-68
32 Page A-18 of A-68
33 Page A-19 of A-68
34 Page A-20 of A-68
35 1,52 1,60 1,44 1,40 1,59 1,28 1,44 1,44 1,39 Page A-21 of A-68
36 Page A-22 of A-68
37 Page A-23 of A-68
38 Page A-24 of A-68
39 Page A-25 of A-68
40 Page A-26 of A-68
41 Page A-27 of A-68
42 Page A-28 of A-68
43 Page A-29 of A-68
44 Page A-30 of A-68
45 2,15 1,42 1,33 1,60 1,35 1,99 1,73 1,37 1,31 Page A-31 of A-68
46 Page A-32 of A-68
47 Page A-33 of A-68
48 Page A-34 of A-68
49 Page A-35 of A-68
50 Page A-36 of A-68
51 Page A-37 of A-68
52 Page A-38 of A-68
53 Page A-39 of A-68
54 Page A-40 of A-68
55 9,96 9,89 8,21 9,87 14,75 7,94 7,58 10,91 7,19 Page A-41 of A-68
56 Page A-42 of A-68
57 Page A-43 of A-68
58 Page A-44 of A-68
59 Page A-45 of A-68
60 Page A-46 of A-68
61 Page A-47 of A-68
62 Page A-48 of A-68
63 Page A-49 of A-68
64 15,25 13,04 7,75 13,33 14,31 6,20 9,01 10,13 6,07 Page A-50 of A-68
65 Page A-51 of A-68
66 Page A-52 of A-68
67 Page A-53 of A-68
68 Page A-54 of A-68
69 Page A-55 of A-68
70 Page A-56 of A-68
71 Page A-57 of A-68
72 Page A-58 of A-68
73 Page A-59 of A-68
74 1,51 1,95 1,76 1,90 1,52 1,10 1,44 1,55 1,21 Page A-60 of A-68
75 Page A-61 of A-68
76 Page A-62 of A-68
77 Page A-63 of A-68
78 Page A-64 of A-68
79 Page A-65 of A-68
80 Page A-66 of A-68
81 Page A-67 of A-68
82 Page A-68 of A-68
83 Page B-1 of B-4
84 Page B-2 of B-4
85 Page B-3 of B-4
86 Page B-4 of B-4
87 Page C-1 of C-192
88 Page C-2 of C-192
89 Page C-3 of C-192
90 Page C-4 of C-192
91 Page C-5 of C-192
92 Page C-6 of C-192
93 Page C-7 of C-192
94 Page C-8 of C-192
95 Page C-9 of C-192
96 Page C-10 of C-192
97 Page C-11 of C-192
98 Page C-12 of C-192
99 Page C-13 of C-192
100 Page C-14 of C-192
101 Page C-15 of C-192
102 Page C-16 of C-192
103 Page C-17 of C-192
104 Page C-18 of C-192
105 Page C-19 of C-192
106 Page C-20 of C-192
107 Page C-21 of C-192
108 Page C-22 of C-192
109 Page C-23 of C-192
110 Page C-24 of C-192
111 Page C-25 of C-192
112 Page C-26 of C-192
113 Page C-27 of C-192
114 Page C-28 of C-192
115 Page C-29 of C-192
116 Page C-30 of C-192
117 Page C-31 of C-192
118 Page C-32 of C-192
119 Page C-33 of C-192
120 Page C-34 of C-192
121 Page C-35 of C-192
122 Page C-36 of C-192
123 Page C-37 of C-192
124 Page C-38 of C-192
125 Page C-39 of C-192
126 Page C-40 of C-192
127 Page C-41 of C-192
128 Page C-42 of C-192
129 Page C-43 of C-192
130 Page C-44 of C-192
131 Page C-45 of C-192
132 Page C-46 of C-192
133 Page C-47 of C-192
134 Page C-48 of C-192
135 Page C-49 of C-192
136 Page C-50 of C-192
137 Page C-51 of C-192
138 Page C-52 of C-192
139 Page C-53 of C-192
140 Page C-54 of C-192
141 Page C-55 of C-192
142 Page C-56 of C-192
143 Page C-57 of C-192
144 Page C-58 of C-192
145 Page C-59 of C-192
146 Page C-60 of C-192
147 Page C-61 of C-192
148 Page C-62 of C-192
149 Page C-63 of C-192
150 Page C-64 of C-192
151 Page C-65 of C-192
152 Page C-66 of C-192
153 Page C-67 of C-192
154 Page C-68 of C-192
155 Page C-69 of C-192
156 Page C-70 of C-192
157 Page C-71 of C-192
158 Page C-72 of C-192
159 Page C-73 of C-192
160 Page C-74 of C-192
161 Page C-75 of C-192
162 Page C-76 of C-192
163 Page C-77 of C-192
164 Page C-78 of C-192
165 Page C-79 of C-192
166 Page C-80 of C-192
167 Page C-81 of C-192
168 Page C-82 of C-192
169 Page C-83 of C-192
170 Page C-84 of C-192
171 Page C-85 of C-192
172 Page C-86 of C-192
173 Page C-87 of C-192
174 Page C-88 of C-192
175 Page C-89 of C-192
176 Page C-90 of C-192
177 Page C-91 of C-192
178 Page C-92 of C-192
179 Page C-93 of C-192
180 Page C-94 of C-192
181 Page C-95 of C-192
182 Page C-96 of C-192
183 Page C-97 of C-192
184 Page C-98 of C-192
185 Page C-99 of C-192
186 Page C-100 of C-192
187 Page C-101 of C-192
188 Page C-102 of C-192
189 Page C-103 of C-192
190 Page C-104 of C-192
191 Page C-105 of C-192
192 Page C-106 of C-192
193 Page C-107 of C-192
194 Page C-108 of C-192
195 Page C-109 of C-192
196 Page C-110 of C-192
197 Page C-111 of C-192
198 Page C-112 of C-192
199 Page C-113 of C-192
200 Page C-114 of C-192
201 Page C-115 of C-192
202 Page C-116 of C-192
203 Page C-117 of C-192
204 Page C-118 of C-192
205 Page C-119 of C-192
206 Page C-120 of C-192
207 Page C-121 of C-192
208 Page C-122 of C-192
209 Page C-123 of C-192
210 Page C-124 of C-192
211 Page C-125 of C-192
212 Page C-126 of C-192
213 Page C-127 of C-192
214 Page C-128 of C-192
215 Page C-129 of C-192
216 Page C-130 of C-192
217 Page C-131 of C-192
218 Page C-132 of C-192
219 Page C-133 of C-192
220 Page C-134 of C-192
221 Page C-135 of C-192
222 Page C-136 of C-192
223 Page C-137 of C-192
224 Page C-138 of C-192
225 Page C-139 of C-192
226 Page C-140 of C-192
227 Page C-141 of C-192
228 Page C-142 of C-192
229 Page C-143 of C-192
230 Page C-144 of C-192
231 Page C-145 of C-192
232 Page C-146 of C-192
233 Page C-147 of C-192
234 Page C-148 of C-192
235 Page C-149 of C-192
236 Page C-150 of C-192
237 Page C-151 of C-192
238 Page C-152 of C-192
239 Page C-153 of C-192
240 Page C-154 of C-192
241 Page C-155 of C-192
242 Page C-156 of C-192
243 Page C-157 of C-192
244 Page C-158 of C-192
245 Page C-159 of C-192
246 Page C-160 of C-192
247 Page C-161 of C-192
248 Page C-162 of C-192
249 Page C-163 of C-192
250 Page C-164 of C-192
251 Page C-165 of C-192
252 Page C-166 of C-192
253 Page C-167 of C-192
254 Page C-168 of C-192
255 Page C-169 of C-192
256 Page C-170 of C-192
257 Page C-171 of C-192
258 Page C-172 of C-192
259 Page C-173 of C-192
260 Page C-174 of C-192
261 Page C-175 of C-192
262 Page C-176 of C-192
263 Page C-177 of C-192
264 Page C-178 of C-192
265 Page C-179 of C-192
266 Page C-180 of C-192
267 Page C-181 of C-192
268 Page C-182 of C-192
269 Page C-183 of C-192
270 Page C-184 of C-192
271 Page C-185 of C-192
272 Page C-186 of C-192
273 Page C-187 of C-192
274 Page C-188 of C-192
275 Page C-189 of C-192
276 Page C-190 of C-192
277 Page C-191 of C-192
278 Page C-192 of C-192
Analytische Qualitätssicherung Baden-Württemberg
Analytische Qualitätssicherung Baden-Württemberg Proficiency Test 2/17 TW S3 alkylphenoles in drinking water Nonylphenol, Octylphenol, Bisphenol-A provided by AQS Baden-Württemberg at Institute for Sanitary
More informationAnalytische Qualitätssicherung Baden-Württemberg
Analytische Qualitätssicherung Baden-Württemberg Proficiency Test 2/15 TW S5 Sulfonylurea herbicides amidosulfuron, metsulfuron-methyl, nicosulfuron, thifensulfuron-methyl, triasulfuron provided by AQS
More informationProficiency Test 2/10 TW O5 Special organic analytes in drinking water
Analytische Qualitätssicherung Baden-Württemberg Proficiency Test 2/ TW O5 Special organic analytes in drinking water Metabolites of pesticides and Glyphosate provided by AQS Baden-Württemberg at Institute
More informationAnalytische Qualitätssicherung Baden-Württemberg
Analytische Qualitätssicherung Baden-Württemberg Proficiency Test UKWIR SS 17 PAH in surface water with suspended solids Anthracene, Fluoranthene, Naphtalene, Benzo[a]pyrene, Benzo[b]fluoranthene, Benzo[k]fluoranthene,
More informationAnalytische Qualitätssicherung Baden-Württemberg
Analytische Qualitätssicherung Baden-Württemberg Proficiency Test /1 - TW S7 Trifluoroacetic acid in drinking water - Trifluoroacetic acid (TFA) Final report provided by AQS Baden-Württemberg at Institute
More informationAnalytische Qualitätssicherung Baden-Württemberg
Analytische Qualitätssicherung Baen-Württemberg Proficiency Test /12 TW O special organic parameters in rinking water acrylamie, epichlororhyrin provie by AQS Baen-Württemberg at Institute for Sanitary
More informationAnalytische Qualitätssicherung Baden-Württemberg
Analytische Qualitätssicherung Baen-Württemberg Proficiency Test 1/13 TW S1 sweeteners an benzotriazoles in rinking water acesulfam, cyclamate, saccharin, sucralose, 1H-benzotriazole, 4-methyl-1H-benzotriazole,
More informationScoring systems for quantitative schemes what are the different principles?
Scoring systems for quantitative schemes what are the different principles? Dr.-Ing. Frank Baumeister TGZ AQS-BW at Institute for Sanitary Engineering, Water Quality and Solid Waste Management of the University
More informationHomogeneity of EQA samples requirements according to ISO/IEC 17043
Homogeneity of EQA samples requirements according to ISO/IEC 17043 Dr.-Ing. Frank Baumeister TGZ AQS-BW at Institute for Sanitary Engineering, Water Quality and Solid Waste Management University of Stuttgart
More informationMeasurement uncertainty revisited Alternative approaches to uncertainty evaluation
Measurement uncertainty revisited Alternative approaches to uncertainty evaluation based on EUROLAB Technical Report No. 1/007 Dr.-Ing. Michael Koch Institute for Sanitary Engineering, Water Quality and
More informationPriority. Profic. iency. University of Stuttgart
Analytische Qualitätssicherung Baen-Württemberg PT-WFD Profic iency Priority pesticies Test 6/ in surface water aclonifen, alachlor, atrazine, bifenox, chlorfenvinphos, chlorpyrifos, cybutryne, iuron,
More informationReproducibility within the Laboratory R w Control Sample Covering the Whole Analytical Process
Flowchart for Nordtest Method (a) Specify measurand Quantify components for within lab reproducibility A control samples B possible steps, not covered by the control sample Quantify bias components Convert
More informationUncertainty of Measurement (Analytical) Maré Linsky 14 October 2015
Uncertainty of Measurement (Analytical) Maré Linsky 14 October 015 Introduction Uncertainty of Measurement GUM (Guide to the Expression of Uncertainty in Measurement ) (Analytical) Method Validation and
More informationWhat is measurement uncertainty?
What is measurement uncertainty? What is measurement uncertainty? Introduction Whenever a measurement is made, the result obtained is only an estimate of the true value of the property being measured.
More informationOA03 UNCERTAINTY OF MEASUREMENT IN CHEMICAL TESTING IN ACCORDANCE WITH THE STANDARD SIST EN ISO/IEC Table of contents
UNCERTAINTY OF MEASUREMENT IN CHEMICAL TESTING IN ACCORDANCE WITH THE STANDARD SIST EN ISO/IEC 17025 Table of contents 1 GENERAL... 2 2 THE STANDARD SIST EN ISO/IEC 17025... 2 3 SA'S POLICY IN IMPLEMENTING
More informationProficiency testing: Aqueous ethanol. Test and measurement Workshop Marcellé Archer. 20 September 2011
Proficiency testing: Aqueous ethanol Test and measurement Workshop Marcellé Archer 20 September 2011 NMISA Ethanol PT schemes Purpose of a PT scheme Consistent good performance is the goal One bad result
More informationISO/TS TECHNICAL SPECIFICATION. Water quality Guidance on analytical quality control for chemical and physicochemical water analysis
TECHNICAL SPECIFICATION ISO/TS 13530 First edition 2009-03-15 Water quality Guidance on analytical quality control for chemical and physicochemical water analysis Qualité de l'eau Lignes directrices pour
More informationSchedule for a proficiency test
Schedule for a proficiency test Once a laboratory haegistered the year s programme the interaction between the laboratory and Eurofins Miljø A/S will be according to the schedule described below. 1 Reminder
More informationThe Role of Proficiency Tests in the Estimation of Measurement Uncertainty of PCDD/PCDF and PCB Determination by Isotope Dilution Methods
The Role of Proficiency Tests in the Estimation of Measurement Uncertainty of PCDD/PCDF and PCB Determination by Isotope Dilution Methods e-mail: stefano@raccanelli.eu Stefano Raccanelli, Environmental
More informationDOE S RADIOLOGICAL TRACEABILITY PROGRAM FOR RADIOANALYTICAL MEASUREMENTS: WORK IN PROGRESS
DOE S RADIOLOGICAL TRACEABILITY PROGRAM FOR RADIOANALYTICAL MEASUREMENTS: WORK IN PROGRESS D. E. McCurdy, Duke Engineering & Services, Bolton, MA and J. S. Morton, Department of Energy, Office of Environmental
More informationIvo Leito University of Tartu
Using method validation and performance data for estimating measurement uncertainty Ivo Leito University of Tartu ivo.leito@ut.ee.05.01 1 Overview The main question of uncertainty evaluation The different
More informationParticipants in the Proficiency Test THM 02/2016
2 February 2016 Participants in the Proficiency Test THM 02/2016 Reference: Letter 5th November 2015 Enclosed we will distribute the samples for the Proficiency Test THM 02/2016. In total, 6 laboratories
More informationLaboratory ID. Laboratory Name. Analyst(s) Auditor. Date(s) of Audit. Type of Audit Initial Biennial Special ELCP TNI/NELAP.
NEW JERSEY DEPARTMENT OF ENVIRONMENTAL PROTECTION OFFICE OF QUALITY ASSURANCE ENVIRONMENTAL LABORATORY CERTIFICATION PROGRAM ON-SITE LABORATORY EVALUATION RADIOCHEMISTRY PROCEDURES Gross Alpha-Gross Beta
More informationSince the publication of the ISO Guide to the Expression
DE SILVA: JOURNAL OF AOAC INTERNATIONAL VOL. 86, NO. 5, 003 1077 SPECIAL GUEST EDITOR SECTION Uncertainty of Analytical Determinations GALAPPATTI M.S. DE SILVA 4, PB Alwis Perera Mawatha, Katubedda, Sri
More informationReport on the 2011 Proficiency Test for the determination of T-2 and HT-2 toxins in wheat flour
CODA CERVA Belgian National Reference Laboratory for Mycotoxins in Food and Feed Report on the 2011 Proficiency Test for the determination of T-2 and HT-2 toxins in wheat flour May 2012 Ph. Debongnie Table
More informationEURL Food Contact Material. ILC 2009/02 BPA in 50% ethanol
EURL Food Contact Material. ILC 9/ BPA in 5% ethanol Report of an interlaboratory comparison organised by the European Union Reference Laboratory for Food Contact Materials ILC1 1 - Photoinitiators in
More informationMETHOD 8033 ACETONITRILE BY GAS CHROMATOGRAPHY WITH NITROGEN-PHOSPHORUS DETECTION
METHOD 80 ACETONITRILE BY GAS CHROMATOGRAPHY WITH NITROGEN-PHOSPHORUS DETECTION 1.0 SCOPE AND APPLICATION 1.1 Method 80 may be used to determine the concentration of acetonitrile (CAS No. 75-05-8) in aqueous
More informationInternational Atomic Energy Agency. Department of Nuclear Sciences and Applications. IAEA Environment Laboratories
International Atomic Energy Agency Department of Nuclear Sciences and Applications IAEA Environment Laboratories Vienna International Centre, P.O. Box 100, 1400 Vienna, Austria REFERENCE SHEET CERTIFIED
More informationValidation and Standardization of (Bio)Analytical Methods
Validation and Standardization of (Bio)Analytical Methods Prof.dr.eng. Gabriel-Lucian RADU 21 March, Bucharest Why method validation is important? The purpose of analytical measurement is to get consistent,
More informationCertificate of analysis Certified reference material code: CRM-00-GTX1&4
Certificate of analysis Certified reference material code: CRM-00-GTX1&4 Name: Gonyautoxin-1 and Gonyautoxin-4 in 0.003 M HCl aq. Batch: 15-001 Description: This Certified Reference Material (CRM) is a
More informationDetermination of Nutrients. Determination of total phosphorus. Extraktion with aqua regia, reflux method. Introduction
Determination of Nutrients Determination of total phosphorus Extraktion with aqua regia, reflux method Introduction This document is developed in the project Horizontal. It is the result of desk studies
More informationInternational interlaboratory study of forensic ethanol standards
International interlaboratory study of forensic ethanol standards Bernard King and Richard Lawn LGC, Queens Road, Teddington, Middlesex, UK TW11 0LY. E-mail: bmjk@lgc.co.uk Received 18th January 1999,
More informationMulti Analyte Custom Grade Solution. Calcium, Iron, Potassium,
1.0 ACCREDITATION / REGISTRATION INORGANIC VENTURES is accredited to ISO Guide 34, "General Requirements for the Competence of Reference Material Producers" and ISO/IEC 17025, "General Requirements for
More informationResults of Proficiency Test OPP, PCP and TeCP in textile December 2016
Results of Proficiency Test OPP, PCP and TeCP in textile December 2016 Organised by: Author: Corrector: Report: (iis) Spijkenisse, the Netherlands ing. A.S. Noordman de Neef dr. R.G. Visser & ing. R. J.
More informationCalculation of Measurement Uncertainty
Handbook for Calculation of Measurement Uncertainty in Environmental Laboratories i ii Handbook for Calculation of Measurement Uncertainty in Environmental Laboratories Nordtest project 1589-0 Version
More informationPhilipp Koskarti
Österreichisches Forschungsinstitut für Chemie und Technik Austrian Research Institute for Chemistry and Technology ISSS round robin 2010 BIOENERGIE Philipp Koskarti 21.10.2010 content Introduction Details
More informationMeasurement Uncertainty, March 2009, F. Cordeiro 1
Measurement Uncertainty, March 2009, F. Cordeiro 1 Uncertainty Estimation on the Quantification of Major Proteins in Milk by Liquid Chromatography Contribution to a Chemical Reference Measurement System
More informationAPPENDIX G EVALUATION OF MEASUREMENT UNCERTAINTY
APPENDIX G EVALUATION OF MEASUREMENT UNCERTAINTY Table of Contents 1. SCOPE... 2 2. REFERENCES... 2 3. TERMS AND DEFINITIONS... 2 4. BACKGROUND... 4 5. EVALUATION OF MEASUREMENT UNCERTAINTY POLICY... 5
More informationAnalysis of interlaboratory comparison when the measurements are not normally distributed
Analysis of interlaboratory comparison when the measurements are not normally distributed Alexandre Allard 1,*, Soraya Amarouche 1* 1 Laboratoire National de métrologie et d Essais, 1 rue Gaston Boissier
More informationSchedule. Draft Section of Lab Report Monday 6pm (Jan 27) Summary of Paper 2 Monday 2pm (Feb 3)
Schedule Assignment Due Date Draft Section of Lab Report Monday 6pm (Jan 27) Quiz for Lab 2 Peer Review of Draft Complete Lab Report 1 Tuesday 9:30am Wednesday 6pm Friday 6pm Summary of Paper 2 Monday
More informationMETHOD 9252A CHLORIDE (TITRIMETRIC, MERCURIC NITRATE)
METHOD 9252A CHLORIDE (TITRIMETRIC, MERCURIC NITRATE) 1.0 SCOPE AND APPLICATION 1.1 This method is applicable to ground water, drinking, surface, and saline waters, and domestic and industrial wastes.
More informationProtocol for the design, conducts and interpretation of collaborative studies (Resolution Oeno 6/2000)
Protocol for the design, conducts and interpretation of collaborative studies (Resolution Oeno 6/2000) INTRODUCTION After a number of meetings and workshops, a group of representatives from 27 organizations
More informationMeasurement uncertainty: Top down or Bottom up?
A White Paper from FOSS Measurement uncertainty: Top down or Bottom up? By Dr. Jürgen Möller P/N 1026582, Issue 1, October 2011 Dedicated Analytical Solutions Measurement uncertainty: Top down or Bottom
More informationPreparation and Certification of IRMM-081a and IRMM-086 Spike Isotopic Reference Materials
Preparation and Certification of IRMM-081a and IRMM-086 Spike Isotopic Reference Materials A. Verbruggen, R. Eykens, F. Kehoe, H. Kühn, S. Richter, Y. Aregbe EUR 22944 EN - 2007 The mission of the IRMM
More informationDust and Gas Stack Emission Proficiency Tests
page 1 of 12 Information Sheet Dust and Gas Stack Emission Proficiency Tests 1. Location 2. Contact 3. Participants Hessisches Landesamt für Naturschutz, Umwelt und Geologie Dezernat I3 Luftreinhaltung:
More informationAPPENDIX G ESTIMATION OF UNCERTAINTY OF MEASUREMENT
APPENDIX G ESTIMATION OF UNCERTAINTY OF MEASUREMENT Table of Contents 1. SCOPE... 2 2. REFERENCES... 2 3. TERMS AND DEFINITIONS... 2 4. BACKGROUND... 4 5. ESTIMATION OF UNCERTAINTY OF MEASUREMENT POLICY...
More informationProvläsningsexemplar / Preview INTERNATIONAL STANDARD ISO Second edition
INTERNATIONAL STANDARD ISO 6974-1 Second edition 2012-05-15 Natural gas Determination of composition and associated uncertainty by gas chromatography Part 1: General guidelines and calculation of composition
More informationA basic introduction to reference materials. POPs Strategy
A basic introduction to reference materials POPs Strategy 2009-2010+ A tutorial 16 September 2009 Angelique Botha R&D metrologist Contents Why do we need reference materials? comparability of results metrological
More informationReturn to Web Version
Page 1 of 6 Page 1 of 6 Return to Web Version Interlaboratory Proficiency Testing on the Analysis of Alkylphenols, Alkylphenol Ethoxylates and Bisphenol A in Surface and Waste Waters According to ISO/CD
More informationREVIEW of Grade 11 Chemistry
REVIEW of Grade 11 Chemistry SCH4U_08-09 NAME: Section A: Review of Rules for Significant Digits All measurements have a certain degree of associated with them. All the accurately known digits and the
More informationCertificate of analysis Certified reference material code: CRM-00-NEO
Nº 2/PMR3 Certificate of analysis Certified reference material code: CRM--NEO Name: Neosaxitoxin dihydrochloride in.3 M HCl aq. Batch: 14-1 Description: This Certified Reference Material (CRM) is a solution
More informationAnalysis For quality control the reference material is analysed at the same time and in the same manner as other samples.
Smedeskovvej 38 DK-8464 Galten CERTIFICATE FOR QC SW4.1B NUTRIENTS IN NATURAL SEAWATER BATCH: VKI-33-5-0217 INSTRUCTIONS FOR USE OF THE REFERENCE MATERIAL Description This reference material consists of
More informationA convenient and economic approach to achieve SI-traceable reference values to be used in drinking-water interlaboratory comparisons
Accred Qual Assur (2007) 12:615 622 DOI 10.1007/s00769-007-0320-3 GENERAL PAPER A convenient and economic approach to achieve SI-traceable reference values to be used in drinking-water interlaboratory
More informationNORDTEST NT TR 537 edition :11
NORDTEST NT TR 537 edition 4 017:11 Handbook for Calculation of Measurement Uncertainty in Environmental Laboratories Nordtest Telephone +45 1 1 44 44 Slettetoften 9, nordtest@nordtest.info DK-630 Taastrup
More informationMEASUREMENT UNCERTAINTY PREPARED FOR ENAO ASSESSOR CALIBRATION COURSE OCTOBER/NOVEMBER Prepared by MJ Mc Nerney for ENAO Assessor Calibration
MEASUREMENT PREPARED FOR ENAO ASSESSOR CALIBRATION COURSE UNCERTAINTY OCTOBER/NOVEMBER 2012 Prepared by for ENAO Assessor Calibration B SCOPE Introduction House Rules Overview 17025 & 15189 MU Approaches
More informationGlossary of Common Laboratory Terms
Accuracy A measure of how close a measured value is to the true value. Assessed by means of percent recovery of spikes and standards. Aerobic Atmospheric or dissolved oxygen is available. Aliquot A measured
More informationANALYSIS CERTIFICATE OF
CERTIFICATE OF ANALYSIS 300 Technology Drive Christiansburg, VA 24073. USA inorganicventures.com tel: 800.669.6799. 540.585.3030 fax: 540.585.3012 info@inorganicventures.com 1.0 INORGANIC VENTURES is an
More informationCertificate of Analysis
Certificate of Analysis Reference Material - Primary Standard Product Name: Metoprolol Tartrate 1.0 mg/ml in Methanol (as free base) Catalogue Number: LGCAMP0027.00-01 Lot Number: 8525 CAS Number: 56392-17-7
More informationExamples of Method Validation Studies Conducted in Different Economies
Examples of Method Validation Studies Conducted in Different Economies Template for group discussion National Metrology Laboratory, Malaysia 8th APMP TCQM-DEC MiC Workshop, Kobe, Japan December 2011 Description
More informationCertificate of Analysis
Certificate of Analysis Reference Material - Primary Standard Product Name: Oxycodone 1.0 mg/ml in Methanol Catalogue Number: Lot Number: 37583 LGCAMP0672.10-01 CAS Number: 76-42-6 Molecular Formula: C
More informationCertified Reference Material - Certificate of Analysis Methylone, Primary Standard
Certified Reference Material - Certificate of Analysis Methylone, Primary Standard Page 1 of 9 Catalog Number: O Lot: Expiration Date: Description: Packaging: Storage: Shipping: Intended Use: Instructions
More informationTC2 EXPERIENCES IN COLLABORATIVE STUDIES, METHOD VALIDATION AND PROFICIENCY TESTING
Distributed in TC2 as document No ICG/TC-2/07-1444 TC2 EXPERIENCES IN COLLABORATIVE STUDIES, METHOD VALIDATION AND PROFICIENCY TESTING E. Guadagnino Stazione Sperimentale del Vetro, Via Briati 10, 30141
More informationCertified Reference Material - Certificate of Analysis
Certified Reference Material - Certificate of Analysis Amiodarone-D 4, Primary Standard A-83 Page 1 of 8 Catalog Number: A-83 Lot: Expiration: Description: Packaging: Storage: Shipping: Intended Use: Instructions
More informationResults of Proficiency Test Rubber/Compounds May 2005
Results of Proficiency Test Rubber/Compounds May 25 Organised by: Spijkenisse, the Netherlands Authors: ing. R.J. Starink Correctors: R. Agten & dr. R.G. Visser Report: iis5p2 June 25 CONTENTS 1 INTRODUCTION...
More informationReference Materials and Proficiency Testing. CropLife International Meeting October 2015 Gina M. Clapper
Reference Materials and Proficiency Testing CropLife International Meeting 15-16 October 2015 Gina M. Clapper Approaches to Improving and Demonstrating Method and Laboratory Performance Analytical quality
More informationSTANDARD OPERATING PROCEDURES
STANDARD OPERATING PROCEDURES for Spectrophotometric Measurement Chl a, Chl b, and Bulk Carotenoids using Methanol Solvent Prepared by EcoAnalysts, Inc. 1420 South Blaine Street, Suite 14 Moscow, ID 83843
More informationHach Company TNTplus 835/836 Nitrate Method Spectrophotometric Measurement of Nitrate in Water and Wastewater
Hach Company TNTplus 835/836 Nitrate Method 10206 Spectrophotometric Measurement of Nitrate in Water and Wastewater Hach Company TNTplus 835/836 Method 10206 Revision 2.2 January 15, 2013 Spectrophotometric
More informationESTIMATION OF UNCERTAINTY IN THE DETERMINATION OF NITROGEN OXIDES EMISSIONS
Chemical Eng. Dept., ISEL From the SelectedWorks of João F Gomes 2006 ESTIMATION OF UNCERTAINTY IN THE DETERMINATION OF NITROGEN OXIDES EMISSIONS João F Gomes Available at: https://works.bepress.com/joao_gomes/9/
More informationMulti Analyte Custom Grade Solution. Aluminum, Potassium, Magnesium, ANALYTE CERTIFIED VALUE ANALYTE CERTIFIED VALUE
1.0 ACCREDITATION / REGISTRATION INORGANIC VENTURES is accredited to ISO Guide 34, "General Requirements for the Competence of Reference Material Producers" and ISO/IEC 17025, "General Requirements for
More informationCertified Reference Material - Certificate of Analysis
Certified Reference Material - Certificate of Analysis Dehydroepiandrosterone 3-sulfate, Primary Standard D-065 Page 1 of 6 Catalog Number: D-065 Lot: H 3 C Expiration: Description: February 2019 Dehydroepiandrosterone
More informationResults of Proficiency Test Benzene & Toluene March 2017
Results of Proficiency Test Benzene & Toluene March 217 Organised by: Authors: Correctors: Report: Institute for Interlaboratory Studies (iis) Spijkenisse Netherlands ing. G.A. Oosterlaken-Buijs dr. R.G.
More informationSWGDRUG GLOSSARY. Independent science-based organization that has the authority to grant
SWGDRUG GLOSSARY These definitions were developed and adopted by the SWGDRUG Core Committee from a variety of sources including The United Nations Glossary of Terms for Quality Assurance and Good Laboratory
More informationUNDERESTIMATING UNCERTAINTY
UNDERESTIMATING UNCERTAINTY Bertil Magnusson, Cyprus, May 017 Eurachem Workshop - Uncertainty in Qualitative and Quantitative Analyses Research Institutes of Sweden Bioscience and Material Chemistry Measure
More informationDevelopment of a harmonised method for specific migration into the new simulant for dry foods established in Regulation 10/2011
Development of a harmonised method for specific migration into the new simulant for dry foods established in Regulation 1/11 stablishment of precision criteria from an U interlaboratory comparison organised
More informationSingle Analyte Custom Grade Solution. CGWH2O1 M2-W H2O µg/ml ea: Tungsten Ammonium Metatungstate
1.0 ACCREDITATION / REGISTRATION INORGANIC VENTURES is accredited to ISO Guide 34, "General Requirements for the Competence of Reference Material Producers" and ISO/IEC 17025, "General Requirements for
More informationDocument No: TR 12 Issue No: 1
ESTIMATION OF THE UNCERTAINTY OF MEASUREMENT BY CALIBRATION LABORATORIES AND SPECIFICATION OF CALIBRATION AND MEASUREMENT CAPABILITY ON SCHEDULES OF ACCREDITATION Prepared by: SADCAS Technical Manage Approved
More informationAnalytical Quality Control ensure the safety of the results of your samples
Analytical Quality Control ensure the safety of the results of your samples New Certified Reference materials ready-to-use for water and waste water analysis The life science business of Merck operates
More informationCHEK Proficiency study 642. Migration of formaldehyde from melamine kitchenware. Date 7 July 2016 Version 1 Status Final Report number CHEK
CHEK Proficiency study 642 Migration of formaldehyde from melamine kitchenware Date 7 July 2016 Version 1 Status Final Report number CHEK-16-642 page 1 Colophon Number 642 Name Migration of formaldehyde
More informationEstablishing traceability and estimating measurement uncertainty in physical, chemical and biological measurements
Establishing traceability and estimating measurement uncertainty in physical, chemical and biological measurements Experimental Design 8.2.2013 Doc. Martti Heinonen etunimi.sukunimi@mikes.fi Outline 1.
More information--> Buy True-PDF --> Auto-delivered in 0~10 minutes. GB Translated English of Chinese Standard: GB5009.
Translated English of Chinese Standard: GB5009.17-2014 www.chinesestandard.net Sales@ChineseStandard.net NATIONAL STANDARD OF GB THE PEOPLE S REPUBLIC OF CHINA National Food Safety Standard-Determination
More informationVAM Project Development and Harmonisation of Measurement Uncertainty Principles
VAM Project 3.2.1 Development and Harmonisation of Measurement Uncertainty Principles Part (d): Protocol for uncertainty evaluation from validation data V J Barwick and S L R Ellison January 2000 LGC/VAM/1998/088
More informationQuality assurance for sensors at the Deutscher Wetterdienst (DWD)
Paper submitted to ICAWS 2017: Topic 3 Sustainability of the measurements: Calibration, intercomparisons, laboratory and field performance tests, quality assurance and control assessment for traceable
More informationSodium Chloride - Analytical Standard
Sodium Chloride - Analytical Standard Determination of Arsenic Former numbering: ECSS/CN 312-1982 & ESPA/CN-E-105-1994 1. SCOPE AND FIELD OF APPLICATION The present EuSalt Analytical Standard describes
More informationPart 14: Water quality Sampling. Guidance on quality assurance and quality control of environmental water sampling and handling
Provläsningsexemplar / Preview INTERNATIONAL STANDARD ISO 5667-14 Second edition 2014-12-15 Water quality Sampling Part 14: Guidance on quality assurance and quality control of environmental water sampling
More informationResults of Proficiency Test Phthalates in Plastics May 2015
Results of Proficiency Test Phthalates in Plastics May 2015 Organised by: Author: Corrector: Report: Institute for Interlaboratory Studies Spijkenisse, the Netherlands ing. C.M. Nijssen-Wester dr. R.G.
More informationStandard Operating Procedure for the Analysis of Dissolved Inorganic Carbon CCAL 21A.1
Standard Operating Procedure for the Analysis of Dissolved Inorganic Carbon CCAL 21A.1 Cooperative Chemical Analytical Laboratory College of Forestry Oregon State University 321 Richardson Hall Corvallis,
More information3. Chemical industry. Because of their modular design, the instruments in the TOC-L series can be equipped for any possible measurement
3. Chemical industry The most commonly used compound in the chemical industry is water not only as a solvent in processing, but also as an energy carrier in the cooling or heating cycle. As vast amounts
More informationCadmium Reduction Method Method to 0.50 mg/l NO 3 N (LR) Powder Pillows
Nitrate DOC316.53.01067 Cadmium Reduction Method Method 8192 0.01 to 0.50 mg/l NO 3 N (LR) Powder Pillows Scope and application: For water, wastewater and seawater. Test preparation Instrument-specific
More informationCALIBRATION CERTIFICATE # 503
CALIBRATION CERTIFICATE # 503 Calibration date : 2011-02-23 Certificate issued : 2012-04-18 Company name Company address City, Province, Canada CLAS 2009-02 Calibration of Mass flow meter Micro Motion
More informationSECTION D.2 AMMONIA NITROGEN
SECTION D.2 AMMONIA NITROGEN CEDR Method Code: NH4F L01 a) Scope and Application i) This method describes the determination of low-level ammonia nitrogen concentrations in filtered samples taken from fresh
More informationQuality assurance for sensors at the Deutscher Wetterdienst (DWD)
Quality assurance for sensors at the Deutscher Wetterdienst (DWD) Quality assurance / maintenance / calibration Holger Dörschel, Dr Tilman Holfelder WMO International Conference on Automatic Weather Stations
More informationCertificate of Analysis
Certificate of Analysis Reference Material - Primary Standard Product Name: LSD (Lysergic Acid Diethylamide) 1.0 mg/ml in Acetonitrile Catalogue Number: Lot Number: 16905 LGCAMP1346.00-11 O CAS Number:
More informationSingle Analyte Mass Spec Solution ± µg/ml g/ml (measured at 20 ± 1 ºC) METHOD NIST SRM# SRM LOT#
1.0 ACCREDITATION / REGISTRATION INORGANIC VENTURES is accredited to ISO Guide 34, "General Requirements for the Competence of Reference Material Producers" and ISO/IEC 17025, "General Requirements for
More informationIntroduction to the evaluation of uncertainty
Manual of Codes of Practice for the Determination of Uncertainties in Mechanical Tests on Metallic Materials SECTION 1 Introduction to the evaluation of uncertainty F A Kandil National Physical Laboratory
More informationSingle Analyte Custom Grade Solution g/ml (measured at 20 ± 1 ºC) ICP Assay NIST SRM 3163 Lot Number:
1.0 ACCREDITATION / REGISTRATION INORGANIC VENTURES is accredited to ISO Guide 34, "General Requirements for the Competence of Reference Material Producers" and ISO/IEC 17025, "General Requirements for
More informationSpecific Accreditation Guidance. Infrastructure and Asset Integrity. Measurement Uncertainty in Geotechnical Testing
Specific Accreditation Guidance Infrastructure and Asset Integrity Measurement Uncertainty in Geotechnical Testing January 2018 Copyright National Association of Testing Authorities, Australia 2018 This
More informationPROFICIENCY TESTING: EXPERIENCES FROM CROATIA ON THE ISSUE OF HEAVY METALS DETERMINATION IN MARINE SEDIMENTS
The First International Proficiency Testing Conference Sinaia, România 11 th 13 th October, 2007 PROFICIENCY TESTING: EXPERIENCES FROM CROATIA ON THE ISSUE OF HEAVY METALS DETERMINATION IN MARINE SEDIMENTS
More informationPersulfate Digestion Method Method to 150 mg/l N (HR) Test N Tube Vials
Nitrogen, Total DOC316.53.01085 Persulfate Digestion Method Method 10072 2 to 150 mg/l N (HR) Test N Tube Vials Scope and application: For water and wastewater. Test preparation Instrument-specific information
More informationThe AAFCO Proficiency Testing Program Statistics and Reporting
The AAFCO Proficiency Testing Program Statistics and Reporting Program Chair: Dr. Victoria Siegel Statistics and Reports: Dr. Andrew Crawford Contents Program Model Data Prescreening Calculating Robust
More informationSodium Chloride - Analytical Standard
Sodium Chloride - Analytical Standard Determination of Total Mercury Former numbering: ECSS/CN 312-1982 & ESPA/CN-E-106-1994 1. SCOPE AND FIELD OF APPLICATION The present EuSalt Analytical Standard describes
More information