Participants in the Proficiency Test THM 02/2016

Transcription

1 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 participate to the proficiency test. Therefore the test is organized as interlaboratory comparison study. Proftest SYKE is the Proficiency Testing Provider No. PT01 (EN ISO 17043:2010) accredited by FINAS (Finnish Accreditation Service, However, the organizing of this PT is not so far included in the accredited scope. 1 General information Organizer Proftest SYKE, Finnish Environment Institute (SYKE), Laboratory Centre Hakuninmaantie 6, FI Helsinki Fax: Contact persons/ Analytical expert: Jari Nuutinen, coordinator and analytical expert, mobile Riitta Koivikko, substitute of coordinator, mobile proftest@environment.fi (primarily this ) jari.nuutinen@environment.fi riitta.koivikko@environment.fi Please, read this letter carefully before analysing any samples. Proftest SYKE guide for participants is available on our website Current proficiency tests. Finnish Environment Institute, Laboratory Centre, Proftest SYKE, tel , proftest@environment.fi,

2 2/8 2 Samples and measurements The samples and measurements for the proficiency test are presented in the table 1 Table 1 Samples and measurements Sample/ preservation Measurement Code Volume/ concentration Trihalomethanes: Synthetic sample 4 ml Chloroform, bromoform, dibromochloromethane, A1T Methanol solution 5 25 µg/ml bromodichloromethane Drinking water Preserved with sodium thiosulfate Swimming pool water Preserved with sodium thiosulfate Swimming pool water Preserved with sodium thiosulfate Trihalomethanes: Chloroform, bromoform, dibromochloromethane, bromodichloromethane Trihalomethanes: Chloroform, bromoform, dibromochloromethane, bromodichloromethane Trihalomethanes: Chloroform, bromoform, dibromochloromethane, bromodichloromethane D2T U3T U4T 250 ml µg/l 250 ml < 150 µg/l 250 ml < 150 µg/l Sodium thiosulfate has been added to the water samples to prevent chlorine formation. Trihalomethanes, CAS numbers and abbreviations Compound CAS number Code in the result sheet Chloroform CHCl3 Bromodichloromethane CHBrCl2 Dibromochloromethane CHBr2Cl Bromoform CHBr3 3 Reporting of receiving of the samples Please, check the content of your sample package immediately after its arrival. If there is any sample container missing, broken or leaking, contact the organizer by proftest@environment.fi The synthetic sample A1T shall be reweighed without the aluminium foil by the PTparticipant immediately after receiving the samples in order to ensure that no evaporation has occured during the transportation. The weight shall be marked in Appendix 1. Please, compare the weight to initial weight marked on the sample label. If the difference is more than 1 %, please contact the organizer for the delivery of new sample. Appendix 1 for notification of sample receiving is also available on our website: Current proficiency tests. Return the filled Appendix 1 by to proftest@environment.fi latest on 10 February 2016.

3 4 Storing and analysing of the samples All samples should be stored cool (4 C) and stabilized to room temperature prior analysis. The samples should be analysed latest on 5 January 2016 according to the normal analytical procedures by the participant. All analysis should be performed as duplicate determinations (two results) and the both results should be reported. 5 Results and reporting The results for the proficiency test should be reported to Proftest SYKE latest on 10 February 2016 using the electronic result sheet. It is available on Proftest SYKE website: Current proficiency tests. The electronic result sheet has to be saved as excel-file on your computer hard disk before opening. On request (proftest@environment.fi) the electronic results sheet would be sent by . Only in special cases, the paper form using Appendix 2 is accepted. Please, report also the bottle number of sample container, the used analytical method, the measurement uncertainty of the used method as well as the approach used for the estimation of the measurement uncertainties. Instructions for filling the results sheet are given in the Appendix 3. Additional information of the used method is filled into the Methods page of the electronic result sheet (if necessary, also Appendix 4 could be used). Please describe shortly, when Other Method or Other equipment/technique is used. Results should be reported in requested units. The PT provider will not correct the erroneously reported results. Only in special cases, where amount of results will be too low for the statistical handlings, unit errors could be taken in account. The preliminary result lists will be distributed to the participants in the week 7 (2016) and the final report will be published on the Proftest website in May 2016 The participants will be informed when the final report is available. Additionally, the hard copy (paper print) of the final report can be ordered with the cost of Assigned value and performance evaluation The calculated concentration (synthetic samples) or the robust mean of the reported results (soil sample) will be used as the assigned value for the concentration of the analyte. The evaluation of the results will be based on z- scores. The target values of the standard deviation for proficiency assessment are for measurements in the synthetic sample A1T is 15 % and in the water samples D2T, U3T and U4T 25 %. 7 Confidentiality The results of the participants will be treated anonymous. 3/8

4 4/8 8 Costs The participation fee is 850. The price is subjected to VAT (0%). We will send out the invoice after the lists of the preliminary results. Additionally, the hard copy (paper copy) of the final report will cost 30, if participant will to have it. Additional samples costs 70 /each. Do not hesitate to ask if you need further information. Sincerely yours, Jari Nuutinen Chemist LIST OF APPENDICES Appendix 1 Notification of sample receiving Appendix 2 Result sheet Appendix 3 Information for the result sheet and estimation procedure of uncertainty Appendix 4 Method descriptions

5 5/8 REPORTING THE SAMPLE ARRIVAL Appendix 1 The samples arrived: Date at o clock The sample containers were in good condition (yes or not) The containers were broken The containers were leaking The samples were missing Temperature of the "TEMPERATURE" sample ºC Weight of the synthetic sample A1T on arrival (without aluminium foil): Sample A1T (no ) Weight on sample lable g, weight after receiving g, difference % Other comments: Laboratory Contact person Phone This form is available on our website Current proficiency test Please, return the filled form at latest 5 February 2016 by to: proftest@environment.fi or by fax to the number:

6 6/8 RESULT SHEET Appendix 2 Result sheet is available from the website Current proficiency tests Results should be reported one significant number more than the analytical instructions requires. Please, check that your results are in the requested unit and in the correct line! LabTest Result Form Filename Not available Comparison 2016/2 Laboratory Contact person Group code Lab code Quality system code (0 = none) Does the lab report data to the environment authorities? (y/n) Method Replicates Uncertainty Analyte Unit Sample Mth N:o Accredited (y/n) Bottle N:o Result 1 Result 2 Result 3 Result 4 UC N:o UC% CHBr2Cl µg/ml A1T CHBr2Cl µg/l D2T CHBr2Cl µg/l U3T CHBr2Cl µg/l U4T CHBr3 µg/ml A1T CHBr3 µg/l D2T CHBr3 µg/l U3T CHBr3 µg/l U4T CHBrCl2 µg/ml A1T CHBrCl2 µg/l D2T CHBrCl2 µg/l U3T CHBrCl2 µg/l U4T CHCl3 µg/ml A1T CHCl3 µg/l D2T CHCl3 µg/l U3T CHCl3 µg/l U4T

7 7/8 Appendix 3 INFORMATION FOR THE RESULT FORM AND PROCEDURES FOR ESTIMA- TION THE MEASUREMENT UNCERTAINTY "Lab Code": permanent code of the laboratory, available on request (proftest@environment.fi) "Group": group code of the laboratory, available on request (proftest@environment.fi) "Quality system code": 0 = No quality system 1 = ISO = ISO series Lab s data is reported to the Finnish environment authorities :- N (for foreign participants) Mth. No. : Proftest SYKE fills in Accredited : Yes (mark: Y) or No (mark: N). Choose Yes if the method that is used is accredited. Bottle No : the bottle number (showing filling order) of the sample bottle. ESTIMATION PROCEDURE OF UNCERTAINTY: UC No : the procedure used for the estimation of the expanded measurement uncertainty *) at 95 % confidence level (IQC = internal quality control) 21. Using the IQC data only from synthetic control sample and/or CRM (X-chart), see e.g. NORDTEST TR 537 1). Using MUkit measurement uncertainty software. 2) 22. Using the IQC data only from synthetic control sample and/or CRM (X-chart), see e.g. NORDTEST TR 537 1). Without MUkit measurement uncertainty software. 23. Using the IQC data from synthetic sample (X-chart) together with the IQC data from routine sample replicates (R-chart or r%-chart), see e.g. NORDTEST TR 537 1). Using MUkit measurement uncertainty software. 24. Using the IQC data from synthetic sample (X-chart) together with the IQC data from routine sample replicates (R-chart or r%-chart), see e.g. NORDTEST TR 537 1). Without MUkit measurement uncertainty software. 25. Using the IQC data and the results obtained in proficiency tests, see e.g. NORDTEST TR 537 1). Using MUkit measurement uncertainty software. 26. Using the IQC data and the results obtained in proficiency tests, see e.g. NORDTEST TR 537 1). Without MUkit measurement uncertainty software. 27. Using the data obtained in method validation. Using MUkit measurement uncertainty software. 28. Using the data obtained in method validation. Without MUkit measurement uncertainty software. 29. Using the "modeling approach" (GUM Guide or EURACHEM Guide Quantifying Uncertainty in Analytical Measurement) 2) 30. No uncertainty estimation 99. Other procedure, please specify *) Please, check that you report the measurement uncertainty as the expanded uncertainty (k=2) UC% : Report your measurement uncertainty as %. Add the corresponding code about your estimation procedure of uncertainty on the result sheet (Appendix 2) or on the electronic result sheet. 1) 2) 3)

8 8/8 METHOD DESCRIPTIONS Appendix 4 Proficiency test THM 2/2016 Trihalomethanes in water METHOD DESCRIPTION Choose method code to the results sheet or mark the appropriate option with (x) or give verbal answer Trihalomethanes in synthetic sample A1T Code Method Verbal answer Equipment 2391 Headspace GC-MS 2392 Purge&Trap GC-MS 2394 GC-MS 2395 GC-ECD 99 Other equipment, which? Trihalomethanes in water samples D2T, U3T and U4T Analytical method Reference/standard method, e.g. ISO Extraction method Code Method (x) Verbal answer Liquid-liquid Headspace Purge&Trap Other method, which? Extraction solvent and volume, e.g. pentane, 10 ml Equipment 2391 Headspace GC-MS 2392 Purge&Trap GC-MS 2394 GC-MS 2395 GC-ECD Injection volume, e.g. 1 ml Stabilization time (min) and temperature ( C) before injection, Headspace Sample collection time (min), Purge&Trap Purg&Trap column Column: lenght (m) / inner diameter (mm) / phase thickness (µm), e.g. 60 m / 0.25 mm / 0.25 µm Internal standars Calibration area (e.g µg/ml) 99 Other equipment, which? Please, return this form with the result sheet at latest 10 February 2016 by to proftest@environment.fi or by Fax to the number: