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CCQM-K120

 

MEASURAND   Mole fraction of carbon dioxide in air

NOMINAL VALUE 380 µmol/mol

 

Degrees of equivalence represented by Di  and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in µmol/mol

Mole fraction of carbon dioxide in air - 380 µmol/mol
Di /µmol/mol
Participating institutes

Enlarged Graph

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CCQM-K120 and COOMET.QM-K120

 

MEASURAND   Mole fraction of carbon dioxide in air

NOMINAL VALUE 480 µmol/mol

 

Degrees of equivalence represented by Di  and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in µmol/mol

Mole fraction of carbon dioxide in air - 480 µmol/mol
Di /µmol/mol
Participating institutes

Enlarged graph

 

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CCQM-K120 and COOMET.QM-K120

 

MEASURAND   Mole fraction of carbon dioxide in air

NOMINAL VALUE 800 µmol/mol

 

Degrees of equivalence represented by Di  and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in µmol/mol

Mole fraction of carbon dioxide in air - 800 µmol/mol
Di /µmol/mol
Participating institutes

Enlarged graph

 

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CCQM-K120

 

MEASURAND   Mole fraction of carbon dioxide in air

NOMINAL VALUE 380 µmol/mol

 

Degrees of equivalence represented by Di  and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in µmol/mol

LABi Di Uneg,i Upos,i
Di /µmol/mol
Di /µmol/mol
Di /µmol/mol
GUM 0.436 4.401
KRISS 0.072 0.228
LNE 0.227 0.796
NIM -0.023 0.226
NMIJ 0.020 0.182
NMISA 0.457 2.002
NOAA -0.011 0.229
NPL 0.001 0.207
VNIIM 0.018 0.138
VSL -0.037 0.298
UME -0.097 0.237
BFKH 4.916 1.711
NIST -1.044 0.400
NPLI 1.144 3.227
Participating institutes
CCQM-K120
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CCQM-K120 and COOMET.QM-K120

 

MEASURAND   Mole fraction of carbon dioxide in air

NOMINAL VALUE 480 µmol/mol

 

Degrees of equivalence represented by Di  and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in µmol/mol

LABi Di Uneg,i Upos,i
Di /µmol/mol
Di /µmol/mol
Di /µmol/mol
GUM 0.394 5.201
INRIM 0.293 1.637
KRISS 0.149 0.225
LNE 0.203 1.007
NIM -0.052 0.296
NMIJ -0.050 0.195
NMISA 0.458 1.606
NOAA -0.103 0.284
NPL 0.035 0.259
VNIIM 0.035 0.175
VSL -0.043 0.371
UME -0.117 0.295
BFKH 14.989 2.118
NIST -0.867 0.451
NPLI -0.343 3.044
BelGIM 0.20 0.70
KazStandard 0.02 2.43
NMC, A*STAR -0.32 0.77
SE "Ukrmetrteststandard" 1.91 0.97
Participating institutes
CCQM-K120
COOMET.QM-K120
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CCQM-K120 and COOMET.QM-K120

 

MEASURAND   Mole fraction of carbon dioxide in air

NOMINAL VALUE 800 µmol/mol

 

Degrees of equivalence represented by Di  and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in µmol/mol

LABi Di Uneg,i Upos,i
Di /µmol/mol
Di /µmol/mol
Di /µmol/mol
GUM 0.395 8.603
INRIM 0.511 2.613
KRISS 0.281 0.464
LNE 0.101 1.707
NMIJ -0.036 0.240
NPL -0.044 0.448
NMISA 0.913 1.034
VNIIM 0.033 0.253
VSL -0.380 0.712
UME -0.157 0.396
NIM -0.604 0.703
NOAA -0.528 0.674
BFKH 0.018 2.907
NIST -0.981 1.109
NPLI 1.879 5.053
BelGIM -0.54 1.35
KazStandard 0.02 4.05
NMC, A*STAR 0.04 1.10
SE "Ukrmetrteststandard" 2.19 1.44
Participating institutes
CCQM-K120
COOMET.QM-K120
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Linked comparison
CCQM-K120
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Metrology area, Sub-field Chemistry and Biology, Gases
Description Ambient CO2
Time of measurements 2017
Status Approved for equivalence
Final Reports of the comparisons
Metrologia, 2019, 56, Tech. Suppl., 08001
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
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
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

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CCQM-K120

 

MEASURAND   Mole fraction of 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 xi 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:
Di = (xi - xi ref) and Ui, its expanded uncertainty, where Ui = 2(uLabi 2 - ui ref 2)1/2.

 

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CCQM-K120 and COOMET.QM-K120

 

MEASURAND   Mole fraction of carbon dioxide in air

NOMINAL VALUE 480 µmol/mol

 

CCQM-K120

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 xi 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:
Di = (xi - xi ref) and Ui, its expanded uncertainty, where Ui = 2(uLabi 2 - ui ref 2)1/2.

 

Linking COOMET.QM-K120 to CCQM-K120

The VNIIM provides the link between the key comparison COOMET.QM-K120 and CCQM-K120, having participated in both comparisons. The linking process is described in Section 3.4 of the COOMET.QM-K120 Final Report.

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CCQM-K120 and COOMET.QM-K120

 

MEASURAND   Mole fraction of carbon dioxide in air

NOMINAL VALUE 800 µmol/mol

 

CCQM-K120

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 xi 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:
Di = (xi - xi ref) and Ui, its expanded uncertainty, where Ui = 2(uLabi 2 - ui ref 2)1/2.

 

Linking COOMET.QM-K120 to CCQM-K120

The VNIIM provides the link between the key comparison COOMET.QM-K120 and CCQM-K120, having participated in both comparisons. The linking process is described in Section 3.4 of the COOMET.QM-K120 Final Report.

Comparison
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CCQM-K120

 

MEASURAND   Mole fraction of carbon dioxide in air

NOMINAL VALUE 380 µmol/mol

 

xi    result of measurement carried out by laboratory i, Labi

u Labi   combined standard uncertainty of xi

xi ref       reference value for the cylinder determined by laboratory i

ui ref       combined standard uncertainty of xi ref 

 

  Lab i Cylinder xi uLab i xiref uiref
      / (µmol/mol) / (µmol/mol) / (µmol/mol) / (µmol/mol)
  GUM D298392 380.100 2.200 379.664 0.044
  KRISS D500642 378.900 0.100 378.828 0.055
  LNE 1029045 379.480 0.395 379.253 0.051
  NIM FB03747 383.430 0.100 383.453 0.052
  NMIJ CPC00486 386.617 0.025** 386.597 0.088
  NMISA M51 8232 380.200 1.000 379.743 0.050
  NOAA CC310084 379.500 0.105 379.511 0.046
  NPL 2179 380.270 0.095 380.269 0.041
  VNIIM M365601 380.200 0.055** 380.182 0.042
  VSL 5604614 378.900 0.140 378.937 0.051
  UME PSM298266 379.920 0.095* 380.017 0.071
  BFKH OMH54 379.800 0.850 374.884 0.099
  NIST FB04278 379.045 0.195 380.088 0.042
  NPLI JJ108891 375.720 1.610 374.576 0.108

 

* Re-submitted value following the decision of the the CCQM GAWG

** Uncertainties below the cutoff value of 0.095 µmol/mol

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CCQM-K120 and COOMET.QM-K120

 

MEASURAND   Mole fraction of carbon dioxide in air

NOMINAL VALUE 480 µmol/mol

 

CCQM-K120

xi    result of measurement carried out by laboratory i, Labi

u Labi   combined standard uncertainty of xi

xi ref       reference value for the cylinder determined by laboratory i

ui ref       combined standard uncertainty of xi ref 

 

  Lab i Cylinder xi uLab i xiref uiref
      / (µmol/mol) / (µmol/mol) / (µmol/mol) / (µmol/mol)
  GUM D298393 478.100 2.600 477.706 0.051
  INRIM D247440 479.300 0.800 479.007 0.173
  KRISS D500647 480.000 0.100 479.851 0.052
  LNE 1029047 477.600 0.500 477.397 0.061
  NIM FB03744 489.150 0.110 489.202 0.099
  NMIJ CPC00494 471.301 0.026** 471.351 0.094
  NMISA M51 8167 479.500 0.800 479.042 0.068
  NOAA CC305198 479.260 0.130 479.363 0.058
  NPL 2170 480.020 0.120 479.985 0.049
  VNIIM M365664 480.180 0.065** 480.145 0.059
  VSL 5604880 480.480 0.180 480.523 0.045
  UME PSM266468 480.420 0.125* 480.537 0.078
  BFKH OMH44 479.900 1.050 464.911 0.138
  NIST FB04300 472.662 0.214 473.529 0.071
  NPLI JJ108862 480.520 1.520 480.863 0.079

 

* Re-submitted value following the decision of the the CCQM GAWG

** Uncertainties below the cutoff value of 0.095 µmol/mol

 

COOMET.QM-K120

The measurement results of participants in COOMET.QM-K120 are listed in Table 9 of COOMET.QM-K120 Final Report.

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CCQM-K120 and COOMET.QM-K120

 

MEASURAND   Mole fraction of carbon dioxide in air

NOMINAL VALUE 800 µmol/mol

 

CCQM-K120

xi    result of measurement carried out by laboratory i, Labi

u Labi   combined standard uncertainty of xi

xi ref       reference value for the cylinder determined by laboratory i

ui ref       combined standard uncertainty of xi ref 

 

  Lab i Cylinder xi uLab i xiref uiref
      / (µmol/mol) / (µmol/mol) / (µmol/mol) / (µmol/mol)
  GUM D298402 800.500 4.300 800.105 0.106
  INRIM D247445 798.900 1.300 798.389 0.128
  KRISS D500672 800.800 0.200 800.519 0.118
  LNE 1029048 802.200 0.850 802.099 0.078
  NMIJ CPC00558 803.658 0.039** 803.694 0.114
  NPL 2181 799.700 0.200 799.744 0.101
  NMISA M518244 799.100 0.500 798.187 0.132
  VNIIM M365707 800.730 0.095 800.697 0.084
  VSL 5604705 795.700 0.300 796.080 0.191
  UME PSM298347 800.760 0.180* 800.917 0.083
  NIM FB03748 809.820 0.130 810.424 0.327
  NOAA CB11668 794.080 0.240 794.608 0.237
  BFKH OMH69 800.300 1.450 800.282 0.100
  NIST FB04287 794.530 0.514 795.511 0.208
  NPLI JJ108854 796.380 2.515 794.501 0.239

 

* Re-submitted value following the decision of the the CCQM GAWG

** Uncertainties below the cutoff value of 0.095 µmol/mol

 

COOMET.QM-K120

The measurement results of participants in COOMET.QM-K120 are listed in Table 10 of COOMET.QM-K120 Final Report.