Lab i x i u i Lab i x i u i / (mg/kg) / (mg/kg) / (mg/kg) / (mg/kg)

Transcription

1 MEASURAND : Mass fraction of total Arsenic in brown rice flour NOMINAL VALUE : 0.05 mg/kg to 0.5 mg/kg MEASURAND : Mass fraction of Cadmium in brown rice flour NOMINAL VALUE : 0.1 mg/kg to 0.5 mg/kg x i : result of measurement carried out by laboratory i x i : result of measurement carried out by laboratory i u i : combined standard uncertainty of x i u i : combined standard uncertainty of x i Lab i x i u i Lab i x i u i / (mg/kg) / (mg/kg) / (mg/kg) / (mg/kg) NMIA KEBS NIST INMETRO INDECOPI NMIJ (2) INRIM NMISA INTI NMIJ (1) GL NMIA NMIJ (1) HSA EXHM/GCSL-EIM NIST NIMT NIM MIRS/IJS/F-2,O NIMT (1) NMIJ (2) NIMT (2) NIM INTI HSA BIM INMETRO EXHM/GCSL-EIM BIM INDECOPI NMIJ reported two measurement results for total Arsenic, and only MIRS/IJS/F-2,O NMIJ (1) value was used to calculate the key comparison reference value. NMIJ and NMIT reported two measurement results for Cadmium, and only NMIJ (1) and NMIT (1) values were used to calculate the key comparison reference value. The BIPM key comparison database, January /5

2 MEASURAND : Mass fraction of total Arsenic and Cadmium in brown rice flour For each measured element, the key comparison reference value, x R, is calculated as the median of the participants results as explained in the section 7 of the Final Report. The standard uncertainty, u R, of x R is estimated as the median ( x i - x R )/ Total Arsenic Cadmium x R / (mg/kg) u R / (mg/kg) For each measured element, the degree of equivalence of each laboratory i with respect to the reference value is given by a pair of terms, both expressed in mg/kg : D i = (x i - x R ) and U i, its expanded uncertainty (k = 2), U i = 2(u 2 i + u 2 R ) 1/2. No pair-wise degrees of equivalence are computed here. The BIPM key comparison database, January /5

3 Degrees of equivalence D i and expanded uncertainty U i (k = 2) expressed in mg/kg MEASURAND : Mass fraction of total Arsenic in brown rice flour MEASURAND : Mass fraction of Cadmium in brown rice flour Lab i D i U i Lab i D i U i / (mg/kg) / (mg/kg) / (mg/kg) / (mg/kg) NMIA KEBS NIST INMETRO INDECOPI NMIJ (2) INRIM NMISA INTI NMIJ (1) GL NMIA NMIJ (1) HSA EXHM/GCSL-EIM NIST NIMT NIM MIRS/IJS/F-2,O NIMT (1) NMIJ (2) NIMT (2) NIM INTI HSA BIM INMETRO EXHM/GCSL-EIM BIM INDECOPI MIRS/IJS/F-2,O NMIJ (1) value used for the calculation of the key comparison reference value. NMIJ (1) and NMIT (1) values used for the calculation of the key comparison reference value. The BIPM key comparison database, January /5

4 NMIA NIST INDECOPI INRIM INTI GL NMIJ (1) EXHM/GCSL-EIM NIMT MIRS/IJS/F-2,O-2 NMIJ (2) NIM HSA INMETRO BIM D i = (x i - x R ) / (mg/kg) CCQM-K108 - Mass fraction of Total Arsenic in brown rice flour 0.12 Degrees of equivalence: D i and expanded uncertainty U i (k = 2) and NMIT (1) values were used to calculate the key comparison reference value. NMIJ (1) value used for the calculation of the key comparison value The BIPM key comparison database, January /5

5 KEBS INMETRO NMIJ (2) NMISA NMIJ (1) NMIA HSA NIST NIM NIMT (1) NIMT (2) INTI BIM EXHM/GCSL-EIM INDECOPI MIRS/IJS/F-2,O-2 D i = (x i - x R ) / (mg/kg) CCQM-K108 - Mass fraction of Cadmium in brown rice flour 0.10 Degrees of equivalence: D i and expanded uncertainty U i (k = 2) NMIJ (1) and NIMT (1) values used for the calculation of the key comparison value The BIPM key comparison database, January /5