MEASURAND : Mass fraction of phenylalanine in the CCQMK78.a sample
Degrees of equivalence : offset D_{i} and expanded uncertainty (k = 2) U_{i} expressed in µg/g
MEASURAND : Mass fraction of isoleucine in the CCQMK78.a sample
Degrees of equivalence : offset D_{i} and expanded uncertainty (k = 2) U_{i} expressed in µg/g
MEASURAND : Mass fraction of leucine in the CCQMK78.a sample
Degrees of equivalence : offset D_{i} and expanded uncertainty (k = 2) U_{i} expressed in µg/g
MEASURAND : Mass fraction of proline in the CCQMK78.a sample
Degrees of equivalence : offset D_{i} and expanded uncertainty (k = 2) U_{i} expressed in µg/g
MEASURAND : Mass fraction of phenylalanine in the CCQMK78.a sample
Degrees of equivalence : offset D_{i} and expanded uncertainty (k = 2) U_{i} expressed in µg/g
Results are presented under A4 printable format in Summary Results (PDF file).
MEASURAND : Mass fraction of isoleucine in the CCQMK78.a sample
Degrees of equivalence : offset D_{i} and expanded uncertainty (k = 2) U_{i} expressed in µg/g
Results are presented under A4 printable format in Summary Results (PDF file).
MEASURAND : Mass fraction of leucine in the CCQMK78.a sample
Degrees of equivalence : offset D_{i} and expanded uncertainty (k = 2) U_{i} expressed in µg/g
Results are presented under A4 printable format in Summary Results (PDF file).
MEASURAND : Mass fraction of proline in the CCQMK78.a sample
Degrees of equivalence : offset D_{i} and expanded uncertainty (k = 2) U_{i} expressed in µg/g
Results are presented under A4 printable format in Summary Results (PDF file).
Metrology area, Subfield  Chemistry and Biology, Organics 
Description  Mass fraction assignment of organic analytes in a multicomponent aqueous calibration solution 
Time of measurements  2016  2017 
Status  Approved for equivalence 
Final Reports of the comparisons  
Measurand  Mass fraction in μg/g of Phe in a sample Nominal values in the range 50 μg/g to 500 μg/g Optional: Mass fraction content of Leu, Ile and Pro 
Transfer device  Amber glass ampoules each containing 1 ml of the CCQMK78.a comparison material, consisting of a gravimetrically prepared solution of amino acids in 0.01 N HCl. 
Comparison type  Key Comparison 
Consultative Committee  CCQM (Consultative Committee for Amount of Substance) 
Conducted by  CCQM (Consultative Committee for Amount of Substance) 
Comments  Results published on 14 March 2019 Mass fraction of multicomponent amino acids in dilute HCL solution

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 
EXHM/GCSLEIM 
National Laboratory of Chemical Metrology/GCSL  Hellenic Institute of Metrology, Greece, EURAMET 
GL 
Government Laboratory, Hong Kong, China, APMP 
HSA 
Health Science Authority, Singapore, APMP 
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 
NMIJ AIST 
National Metrology Institute of Japan, Japan, APMP 
NMISA 
National Metrology Institute of South Africa, South Africa, AFRIMETS 
NRC 
National Research Council, Canada, SIM 
PTB 
PhysikalischTechnische Bundesanstalt, Germany, EURAMET 
UME 
TÜBITAK Ulusal Metroloji Enstitüsü, Türkiye, EURAMET 
VNIIM 
D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET 
This page proposes printout 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 phenylalanine in the CCQMK78.a sample
The key comparison reference value for the mass fraction of phenylalanine x_{R} was obtained from the DerSimonianLaird varianceweighted mean (DSLmean) of the participants results excluding outliers. The computation of x_{R} and and its associated uncertainty u_{R }is explained in the page 17 of the Final report. x_{R} = 488.5 µg/g, u_{R} = 0.49 µg/g 
The degree of equivalence of laboratory i with respect to the key comparison reference value is given by a pair of terms: D_{i} = (x_{i}  x_{R}) and U_{i}, its expanded uncertainty (k = 2), both expressed in µg/g, with U_{i} = 2(u_{i}^{2} + u_{R}^{2})^{1/2}. 
No pairwise degrees of equivalence are computed for this comparison. 
MEASURAND : Mass fraction of isoleucine in the CCQMK78.a sample
The key comparison reference value for the mass fraction of phenylalanine x_{R} was obtained from the DerSimonianLaird varianceweighted mean (DSLmean) of the participants results excluding outliers. The computation of x_{R} and and its associated uncertainty u_{R }is explained in the page 17 of the Final report. x_{R} = 215.1 µg/g, u_{R} = 0.15 µg/g 
The degree of equivalence of laboratory i with respect to the key comparison reference value is given by a pair of terms: D_{i} = (x_{i}  x_{R}) and U_{i}, its expanded uncertainty (k = 2), both expressed in µg/g, with U_{i} = 2(u_{i}^{2} + u_{R}^{2})^{1/2}. 
No pairwise degrees of equivalence are computed for this comparison. 
MEASURAND : Mass fraction of leucine in the CCQMK78.a sample
The key comparison reference value for the mass fraction of phenylalanine x_{R} was obtained from the DerSimonianLaird varianceweighted mean (DSLmean) of the participants results excluding outliers. The computation of x_{R} and and its associated uncertainty u_{R }is explained in the page 17 of the Final report. x_{R} = 199.9 µg/g, u_{R} = 0.26 µg/g 
The degree of equivalence of laboratory i with respect to the key comparison reference value is given by a pair of terms: D_{i} = (x_{i}  x_{R}) and U_{i}, its expanded uncertainty (k = 2), both expressed in µg/g, with U_{i} = 2(u_{i}^{2} + u_{R}^{2})^{1/2}. 
No pairwise degrees of equivalence are computed for this comparison. 
MEASURAND : Mass fraction of proline in the CCQMK78.a sample
The key comparison reference value for the mass fraction of phenylalanine x_{R} was obtained from the DerSimonianLaird varianceweighted mean (DSLmean) of the participants results excluding outliers. The computation of x_{R} and and its associated uncertainty u_{R }is explained in the page 17 of the Final report. x_{R} = 46.9 µg/g, u_{R} = 0.13 µg/g 
The degree of equivalence of laboratory i with respect to the key comparison reference value is given by a pair of terms: D_{i} = (x_{i}  x_{R}) and U_{i}, its expanded uncertainty (k = 2), both expressed in µg/g, with U_{i} = 2(u_{i}^{2} + u_{R}^{2})^{1/2}. 
No pairwise degrees of equivalence are computed for this comparison. 
MEASURAND : Mass fraction of phenylalanine in the CCQMK78.a sample
x_{i} : result of measurement carried out by laboratory i
u_{i} : combined standard uncertainty of x_{i}
MEASURAND : Mass fraction of isoleucine in the CCQMK78.a sample
x_{i} : result of measurement carried out by laboratory i
u_{i} : combined standard uncertainty of x_{i}
MEASURAND : Mass fraction of leucine in the CCQMK78.a sample
x_{i} : result of measurement carried out by laboratory i
u_{i} : combined standard uncertainty of x_{i}
MEASURAND : Mass fraction of proline in the CCQMK78.a sample
x_{i} : result of measurement carried out by laboratory i
u_{i} : combined standard uncertainty of x_{i}