CCQMK120
MEASURAND: Amount carbon dioxide in air
NOMINAL VALUE: 380 µmol/mol
Degrees of equivalence D_{i} and expanded uncertainty U_{i} (k = 2) expressed in µmol/mol
CCQMK120
MEASURAND: Amount carbon dioxide in air
NOMINAL VALUE: 480 µmol/mol
Degrees of equivalence D_{i} and expanded uncertainty U_{i} (k = 2) expressed in µmol/mol
CCQMK120
MEASURAND: Amount carbon dioxide in air
NOMINAL VALUE: 800 µmol/mol
Degrees of equivalence D_{i} and expanded uncertainty U_{i} (k = 2) expressed in µmol/mol
CCQMK120
MEASURAND: Amount carbon dioxide in air
NOMINAL VALUE: 380 µmol/mol
Degrees of equivalence D_{i} and expanded uncertainty U_{i} (k = 2) expressed in µmol/mol
Results are presented under A4 printable format in Summary Results (.PDF file).
CCQMK120
MEASURAND: Amount carbon dioxide in air
NOMINAL VALUE: 480 µmol/mol
Degrees of equivalence D_{i} and expanded uncertainty U_{i} (k = 2) expressed in µmol/mol
Results are presented under A4 printable format in Summary Results (.PDF file).
CCQMK120
MEASURAND: Amount carbon dioxide in air
NOMINAL VALUE: 800 µmol/mol
Degrees of equivalence D_{i} and expanded uncertainty U_{i} (k = 2) expressed in µmol/mol
Results are presented under A4 printable format in Summary Results (.PDF file).
Metrology area, Subfield  Chemistry and Biology, Gases 
Description  Ambient CO_{2} 
Time of measurements  2017 
Status  Approved for equivalence 
Final Reports of the comparisons  
Measurand  Amount of carbon dioxide in air 
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  Results published on 6 December 2018 Carbon dioxide in air

Pilot institute 
BIPM
Bureau International des Poids et Mesures BIPM  International Organization 
Contact person  E. Flores +33 1 45 07 70 92 
Pilot laboratory  

BIPM 
Bureau International des Poids et Mesures, BIPM  International Organization, N/A 
BFKH 
Government Office of the Capital City Budapest, Hungary, EURAMET 
GUM 
Glowny Urzad Miar, Central Office of Measures, Poland, EURAMET 
INRIM 
Istituto Nazionale di Ricerca Metrologica, Italy, EURAMET 
KRISS 
Korea Research Institute of Standards and Science, Korea, Republic of, APMP 
LNE 
Laboratoire national de métrologie et d'essais, France, EURAMET 
NIM 
National Institute of Metrology, China, 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 
NOAA/ESRL 
NOAA Earth System Research Laboratory (NOAA/ESRL), WMO  International Organization, SIM 
NPL 
National Physical Laboratory, United Kingdom, EURAMET 
NPLI 
CSIR National Physical Laboratory of India, India, APMP 
UME 
TÜBITAK Ulusal Metroloji Enstitüsü, Türkiye, EURAMET 
VNIIM 
D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET 
VSL 
VSL, Netherlands, EURAMET 
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" :
CCQMK120
MEASURAND: Amount carbon dioxide in air
NOMINAL VALUE: 380 µmol/mol
There is no single reference value for this comparison. The Key Comparison Reference Values were obtained by applying a linear regression to a consistent set of results (excluding BFKH, NIST and NPLI). The value x_{i}_{ref} is taken as the Key Comparison Reference Value for laboratory i. 
The degree of equivalence of each laboratory with respect to the reference value is given by a pair of terms, both expressed in µmol/mol: D_{i} = (x_{i}  x_{i}_{ref}) and U_{i}, its expanded uncertainty, where U_{i}=(2(u_{Lab i}^{2} + u_{i}_{ref}^{2})^{1/2}. 
CCQMK120
MEASURAND: Amount carbon dioxide in air
NOMINAL VALUE: 480 µmol/mol
There is no single reference value for this comparison. The Key Comparison Reference Values were obtained by applying a linear regression to a consistent set of results (excluding BFKH, NIST and NPLI). The value x_{i}_{ref} is taken as the Key Comparison Reference Value for laboratory i. 
The degree of equivalence of each laboratory with respect to the reference value is given by a pair of terms, both expressed in µmol/mol: D_{i} = (x_{i}  x_{i}_{ref}) and U_{i}, its expanded uncertainty, where U_{i}=(2(u_{Lab i}^{2} + u_{i}_{ref}^{2})^{1/2}. 
CCQMK120
MEASURAND: Amount carbon dioxide in air
NOMINAL VALUE: 380 µmol/mol
There is no single reference value for this comparison. The Key Comparison Reference Values were obtained by applying a linear regression to a consistent set of results (excluding BFKH, NIM, NIST, NOAA and NPLI). The value x_{i}_{ref} is taken as the Key Comparison Reference Value for laboratory i. 
The degree of equivalence of each laboratory with respect to the reference value is given by a pair of terms, both expressed in µmol/mol: D_{i} = (x_{i}  x_{i}_{ref}) and U_{i}, its expanded uncertainty, where U_{i}=(2(u_{Lab i}^{2} + u_{i}_{ref}^{2})^{1/2}. 
CCQMK120
MEASURAND: Amount carbon dioxide in air
NOMINAL VALUE: 380 µmol/mol
x_{i} : result of measurement carried out by laboratory i
u_{Lab i} : standard uncertainty of x_{i}
x_{iref} : reference value for the cylinder determined by laboratory i
u_{iref} : combined standard uncertainty of x_{i}_{ref }
* Resubmitted value following the decision of the the CCQM GAWG
** Uncertainties below the cutoff value of 0.095 µmol/mol
CCQMK120
MEASURAND: Amount carbon dioxide in air
NOMINAL VALUE: 480 µmol/mol
x_{i} : result of measurement carried out by laboratory i
u_{Lab i} : standard uncertainty of x_{i}
x_{iref} : reference value for the cylinder determined by laboratory i
u_{iref} : combined standard uncertainty of x_{i}_{ref }
* Resubmitted value following the decision of the the CCQM GAWG
** Uncertainties below the cutoff value of 0.095 µmol/mol
CCQMK120
MEASURAND: Amount carbon dioxide in air
NOMINAL VALUE: 800 µmol/mol
x_{i} : result of measurement carried out by laboratory i
u_{Lab i} : standard uncertainty of x_{i}
x_{iref} : reference value for the cylinder determined by laboratory i
u_{iref} : combined standard uncertainty of x_{i}_{ref }
* Resubmitted value following the decision of the the CCQM GAWG
** Uncertainties below the cutoff value of 0.095 µmol/mol