MEASURAND : Mass fraction of Valine in the CCQM-K55.c samples
Degrees of equivalence : offset Di and expanded uncertainty (k = 2) Ui expressed in mg/g, and also in relative terms
xR = 992.0 mg/g
2 uR = 0.6 mg/g
UCENAM = 112.76 mg/g
MEASURAND : Mass fraction of Related Structure Impurities in the CCQM-K55.c samples
Degrees of equivalence : offset Di and expanded uncertainty (k = 2) Ui expressed in mg/g, and also in relative terms
xR = 7.60 mg/g
2 uR = 0.48 mg/g
MEASURAND : Mass fraction of Water in the CCQM-K55.c samples
Degrees of equivalence : offset Di and expanded uncertainty (k = 2) Ui expressed in mg/g, and also in relative terms
xR = 0.155 mg/g
2 uR = 0.084 mg/g
MEASURAND : Mass fraction of Volatile Organics in the CCQM-K55.c samples
Degrees of equivalence : offset Di and expanded uncertainty (k = 2) Ui expressed in mg/g
xR = 0.0 mg/g and 2 uR+ = 0.24, 2 uR- = 0.0 mg/g
MEASURAND : Mass fraction of Non-Volatile Content in the CCQM-K55.bc samples
Degrees of equivalence : offset Di and expanded uncertainty (k = 2) Ui expressed in mg/g, and in relative terms
xR = 0.25 mg/g
2 uR = 0.288 mg/g
MEASURAND : Mass fraction of Valine in the CCQM-K55.c samples
Degrees of equivalence : offset Di and expanded uncertainty (k = 2) Ui expressed in mg/g
xR = 992.0 mg/g and 2 uR = 0.6 mg/g
Results are presented under A4 printable format in Summary Results (PDF file).
MEASURAND : Mass fraction of Related Structure Impurities in the CCQM-K55.c samples
Degrees of equivalence : offset Di and expanded uncertainty (k = 2) Ui expressed in mg/g
xR = 7.60 mg/g and 2 uR = 0.48 mg/g
Results are presented under A4 printable format in Summary Results (PDF file).
MEASURAND : Mass fraction of Water in the CCQM-K55.c samples
Degrees of equivalence : offset Di and expanded uncertainty (k = 2) Ui expressed in mg/g
xR = 0.155 mg/g and 2 uR = 0.084 mg/g
Results are presented under A4 printable format in Summary Results (PDF file).
MEASURAND : Mass fraction of Volatile Organics in the CCQM-K55.c samples
Degrees of equivalence : offset Di and expanded uncertainty (k = 2) Ui expressed in mg/g
xR = 0.0 mg/g and 2 uR+ = 0.24, 2 uR- = 0.0 mg/g
Results are presented under A4 printable format in Summary Results (PDF file).
MEASURAND : Mass fraction of Non-Volatile Content in the CCQM-K55.bc samples
Degrees of equivalence : offset Di and expanded uncertainty (k = 2) Ui expressed in mg/g
xR = 0.25 mg/g and 2 uR = 0.288 mg/g
Results are presented under A4 printable format in Summary Results (PDF file).
| Metrology area, Sub-field | Chemistry and Biology, Organics |
| Description | Purity assessment of high purity organic materials: L-(+)-Valine |
| Time of measurements | 2012 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| Measurand | Mass fraction in mg/g of L-(+)-Valine in the comparison sample |
| Transfer device | Dedicated samples |
| Comparison type | Key Comparison |
| Consultative Committee | CCQM (Consultative Committee for Amount of Substance) |
| Conducted by | CCQM (Consultative Committee for Amount of Substance) |
| Comments | If mass balance approach used, participants must also provide estimates of the mass fraction content of each sub-class of impurity contributing to the derived value for the main component. Results published on 24 June 2014 Purity assessment of high purity organic materials: L-(+)-Valine
|
| Pilot institute |
BIPM
Bureau International des Poids et Mesures BIPM - International Organization |
| Contact person | Steven Westwood +33 (0) 1 45 07 70 57 |
| Pilot laboratory | |
|---|---|
| BIPM |
Bureau International des Poids et Mesures, BIPM - International Organization, N/A |
| BAM |
Bundesanstalt für Materialforschung und -prüfung, Germany, EURAMET |
| CENAM |
Centro Nacional de Metrologia, Mexico, SIM |
| GL |
Government Laboratory, Hong Kong, China, APMP |
| HSA |
Health Science Authority, Singapore, APMP |
| INMETRO |
Instituto Nacional de Metrologia, Qualidade e Tecnologia, Brazil, SIM |
| IRMM |
Institute for Reference Materials and Measurements, European Union, EURAMET |
| KRISS |
Korea Research Institute of Standards and Science, Korea, Republic of, APMP |
| LGC |
Laboratory of the Government Chemist, United Kingdom, EURAMET |
| LNE |
Laboratoire national de métrologie et d'essais, France, EURAMET |
| NIM |
National Institute of Metrology, China, APMP |
| NIMT |
National Institute of Metrology (Thailand), Thailand, APMP |
| NIST |
National Institute of Standards and Technology, United States, SIM |
| NMIA |
National Measurement Institute, Australia, Australia, APMP |
| NMIJ AIST |
National Metrology Institute of Japan, Japan, APMP |
| NMISA |
National Metrology Institute of South Africa, South Africa, AFRIMETS |
| NML-SIRIM |
National Metrology Laboratory, SIRIM Berhad (became NMIM), Malaysia, APMP |
| NRC |
National Research Council, Canada, SIM |
| UME |
TÜBITAK Ulusal Metroloji Enstitüsü, Türkiye, EURAMET |
| VNIIM |
D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET |
This page proposes print-out on A4 paper (portrait) of the comparison details (best printed out using a black and white printer).
Please, select items to be printed out, then click on "OK" :
MEASURAND : Mass fraction of Valine in the CCQM-K55.c samples
|
The key comparison reference value for the mass fraction of valine, xR, was calculated by substraction from the limit value of 1000 mg/g of the summation of the individual estimates for each contributing class of impurities present in CCQM-K55.c samples, as explained in page 23 of the Final Report. Its standard uncertainty, uR, is computed by combination in quadrature of the uncertainties associated with each contributing impurity estimate and also uncertainties in the inter-unit homogeneity of related substance impurity content. xR = 992.0 mg/g, uR = 0.3 mg/g |
| The degree of equivalence of laboratory i with respect to the key comparison reference value is given by a pair of terms: Di = (xi - xR) and Ui, its expanded uncertainty (k = 2), both expressed in mg/g, with Ui = 2(ui2 + uR2)1/2. |
| No pair-wise degrees of equivalence are computed for this comparison. |
MEASURAND : Mass fraction of Related Structure Impurities in the CCQM-K55.c samples
|
Key comparison reference values (xR) and associated standard uncertainty (uR) were assigned for the mass fraction of each orthogonal impurity class - related substances, water, volatile organics and non-volatiles - quantified by the participants in CCQM-K55.c who used a mass balance approach to assign the valine content. They are consensus values derived from the individual data supplied by each participant. The assignment method varied by impurity class and each is separately described on pages 11 to page 18 of the Final Report. For Total Related Structure Impurities, xR = 7.60 mg/g, uR = 0.24 mg/g |
| The degree of equivalence of laboratory i with respect to the key comparison reference value is given by a pair of terms: Di = (xi - xR) and Ui, its expanded uncertainty (k = 2), both expressed in mg/g, with Ui = 2(ui2 + uR2)1/2. |
| No pair-wise degrees of equivalence are computed for this comparison. |
MEASURAND : Mass fraction of Water in the CCQM-K55.c samples
|
Key comparison reference values (xR) and associated standard uncertainty (uR) were assigned for the mass fraction of each orthogonal impurity class - related substances, water, volatile organics and non-volatiles - quantified by the participants in CCQM-K55.c who used a mass balance approach to assign the valine content. They are consensus values derived from the individual data supplied by each participant. The assignment method varied by impurity class and each is separately described on pages 11 to page 18 of the Final Report. For Water, xR = 0.155 mg/g, uR = 0.042 mg/g |
| The degree of equivalence of laboratory i with respect to the key comparison reference value is given by a pair of terms: Di = (xi - xR) and Ui, its expanded uncertainty (k = 2), both expressed in mg/g, with Ui = 2(ui2 + uR2)1/2. |
| No pair-wise degrees of equivalence are computed for this comparison. |
MEASURAND : Mass fraction of Volatile Organics in the CCQM-K55.c samples
|
Key comparison reference values (xR) and associated standard uncertainty (uR) were assigned for the mass fraction of each orthogonal impurity class - related substances, water, volatile organics and non-volatiles - quantified by the participants in CCQM-K55.c who used a mass balance approach to assign the valine content. They are consensus values derived from the individual data supplied by each participant. The assignment method varied by impurity class and each is separately described on pages 11 to page 18 of the Final Report. For Volatile Organics, xR = 0.0 mg/g, uR+ = 0.12 mg/g, uR- = 0.0 mg/g |
| The degree of equivalence of laboratory i with respect to the key comparison reference value is given by a pair of terms: Di = (xi - xR) and Ui, its expanded uncertainty (k = 2), both expressed in mg/g, with Ui = 2(ui2 + uR2)1/2. |
| No pair-wise degrees of equivalence are computed for this comparison. |
MEASURAND : Mass fraction of Non-Volatile Content in the CCQM-K55.c samples
|
Key comparison reference values (xR) and associated standard uncertainty (uR) were assigned for the mass fraction of each orthogonal impurity class - related substances, water, volatile organics and non-volatiles - quantified by the participants in CCQM-K55.c who used a mass balance approach to assign the valine content. They are consensus values derived from the individual data supplied by each participant. The assignment method varied by impurity class and each is separately described on pages 11 to page 18 of the Final Report. For Non-Volatiles, xR = 0.25 mg/g, uR = 0.144 mg/g |
| The degree of equivalence of laboratory i with respect to the key comparison reference value is given by a pair of terms: Di = (xi - xR) and Ui, its expanded uncertainty (k = 2), both expressed in mg/g, with Ui = 2(ui2 + uR2)1/2. |
| No pair-wise degrees of equivalence are computed for this comparison. |
MEASURAND : Mass fraction of Valine in the CCQM-K55.c samples
xi : result of measurement carried out by laboratory i
ui : combined standard uncertainty of xi
MEASURAND : Mass fraction of Related Structure Impurities in the CCQM-K55.c samples
xi : result of measurement carried out by laboratory i
ui : combined standard uncertainty of xi
MEASURAND : Mass fraction of Water in the CCQM-K55.c samples
xi : result of measurement carried out by laboratory i
ui : combined standard uncertainty of xi
MEASURAND : Mass fraction of Volatile Organics in the CCQM-K55.c samples
xi : result of measurement carried out by laboratory i
ui : combined standard uncertainty of xi
MEASURAND : Mass fraction of Non-Volatile Content in the CCQM-K55. c samples
xi : result of measurement carried out by laboratory i
ui : combined standard uncertainty of xi
