Comparison Display

CIPM MRA PARTICIPANTS

The KCDB - the BIPM key comparison database – supports the CIPM MRA. The KCDB contains information on the internationally recognized Calibration and Measurement Capabilities (CMCs) for services available from the participating institutes, and the key and supplementary comparisons supporting these CMCs.

All data listed in the KCDB have been reviewed and approved within the CIPM Mutual Recognition Arrangement

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CIPM MRA PARTICIPANTS

CMC statistics

CMC statistics

Comparison statistics

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

MEASURAND : Amount-of-substance fraction of Nitrogen in Natural gas type II
NOMINAL VALUE : 0.07 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

Degrees of equivalence, offset D_i and expanded uncertainty (k = 2) U_i, shown in relative terms (%)

Red diamonds: participants in CCQM-K23.b
Green triangles: participants in COOMET.QM-K23.b

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

MEASURAND : Amount-of-substance fraction of Carbon dioxide in Natural gas type II
NOMINAL VALUE : 0.03 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

Degrees of equivalence, D_i and expanded uncertainty (k = 2) U_i, shown in relative terms (%)

Red diamonds: participants in CCQM-K23.b
Green triangles: participants in COOMET.QM-K23.b

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

MEASURAND : Amount-of-substance fraction of Ethane in Natural gas type II
NOMINAL VALUE : 0.094 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

Degrees of equivalence, offset D_i and expanded uncertainty (k = 2) U_i, shown in relative terms (%)

Red diamonds: participants in CCQM-K23.b
Green triangles: participants in COOMET.QM-K23.b

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

MEASURAND : Amount-of-substance fraction of Propane in Natural gas type II
NOMINAL VALUE : 0.034 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

Degrees of equivalence, offset D_i and expanded uncertainty (k = 2) U_i, shown in relative terms (%)

Red diamonds: participants in CCQM-K23.b
Green triangles: participants in COOMET.QM-K23.b

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

MEASURAND : Amount-of-substance fraction of iso-Butane in Natural gas type II
NOMINAL VALUE : 0.008 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

Degrees of equivalence, offset D_i and expanded uncertainty (k = 2) U_i, shown in relative terms (%)

Red diamonds: participants in CCQM-K23.b
Green triangles: participants in COOMET.QM-K23.b

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

MEASURAND : Amount-of-substance fraction of n-Butane in Natural gas type II
NOMINAL VALUE : 0.01 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

Degrees of equivalence, offset D_i and expanded uncertainty (k = 2) U_i, shown in relative terms (%)

Red diamonds: participants in CCQM-K23.b
Green triangles: participants in COOMET.QM-K23.b

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

MEASURAND : Amount-of-substance fraction of Methane in Natural gas type II
NOMINAL VALUE : 0.754 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

Degrees of equivalence, offset D_i and expanded uncertainty (k = 2) U_i, shown in relative terms (%)

Red diamonds: participants in CCQM-K23.b
Green triangles: participants in COOMET.QM-K23.b

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

MEASURAND : Amount-of-substance fraction of Nitrogen in Natural gas type II
NOMINAL VALUE : 0.07 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

Degrees of equivalence, offset D_i and expanded uncertainty (k = 2) U_i,
expressed in 10^-2 mol/mol, and given in relative terms (%)

* indicates participants in COOMET.QM-K23.b

Results are presented under A4 printable format in Summary Results (.PDF file).

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

MEASURAND : Amount-of-substance fraction of Carbon dioxide in Natural gas type II
NOMINAL VALUE : 0.03 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

Degrees of equivalence, offset D_i and expanded uncertainty (k = 2) U_i,
expressed in 10^-2 mol/mol, and given in relative terms (%)

* indicates participants in COOMET.QM-K23.b

Results are presented under A4 printable format in Summary Results (.PDF file).

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

MEASURAND : Amount-of-substance fraction of Ethane in Natural gas type II
NOMINAL VALUE : 0.094 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

Degrees of equivalence, offset D_i and expanded uncertainty (k = 2) U_i,
expressed in 10^-2 mol/mol, and given in relative terms (%)

* indicates participants in COOMET.QM-K23.b

Results are presented under A4 printable format in Summary Results (.PDF file).

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

MEASURAND : Amount-of-substance fraction of Propane in Natural gas type II
NOMINAL VALUE : 0.034 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

Degrees of equivalence, offset D_i and expanded uncertainty (k = 2) U_i,
expressed in 10^-2 mol/mol, and given in relative terms (%)

* indicates participants in COOMET.QM-K23.b

Results are presented under A4 printable format in Summary Results (.PDF file).

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

MEASURAND : Amount-of-substance fraction of iso-Butane in Natural gas type II
NOMINAL VALUE : 0.008 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

Degrees of equivalence, offset D_i and expanded uncertainty (k = 2) U_i,
expressed in 10^-2 mol/mol, and given in relative terms (%)

* indicates participants in COOMET.QM-K23.b

Results are presented under A4 printable format in Summary Results (.PDF file).

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

MEASURAND : Amount-of-substance fraction of n-Butane in Natural gas type II
NOMINAL VALUE : 0.01 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

Degrees of equivalence, offset D_i and expanded uncertainty (k = 2) U_i,
expressed in 10^-2 mol/mol, and given in relative terms (%)

* indicates participants in COOMET.QM-K23.b

Results are presented under A4 printable format in Summary Results (.PDF file).

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

MEASURAND : Amount-of-substance fraction of Methane in Natural gas type II
NOMINAL VALUE : 0.754 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

Degrees of equivalence, offset D_i and expanded uncertainty (k = 2) U_i,
expressed in 10^-2 mol/mol, and given in relative terms (%)

* indicates participants in COOMET.QM-K23.b

Results are presented under A4 printable format in Summary Results (.PDF file).

Comparison

Comparison close

CCQM-K23.b

Information & contact
Participants

Metrology area, Sub-field	Chemistry and Biology, Gases
Description	Natural gas type II
Time of measurements	2005 - 2006
Status	Approved for equivalence

Final Reports of the comparisons	Metrologia, 2010, 47, Tech. Suppl., 08013
Measurand	Amount-of-substance fraction of Natural gas type II: Nitrogen (0.07 mol/mol), Carbon dioxide (0.03 mol/mol), Ethane (0.094 mol/mol), Propane (0.034 mol/mol), n-Butane (0.01 mol/mol), i-Butane (0.008 mol/mol), Methane (balance)
Transfer device	Gas cylinders

Comparison type	Key Comparison
Consultative Committee	CCQM (Consultative Committee for Amount of Substance)
Conducted by	CCQM (Consultative Committee for Amount of Substance)
Comments	CCQM-K23.b was placed in the KCDB archives on 14 November 2023
Pilot institute	VSL VSL Netherlands
Contact person	A. van der Veen +31 15 2691500

Pilot laboratory
VSL	VSL, Netherlands, EURAMET

BAM	Bundesanstalt für Materialforschung und -prüfung, Germany, EURAMET

CEM	Centro Español de Metrologia, Spain, EURAMET

CENAM

Centro Nacional de Metrologia, Mexico, SIM

CMI	Czech Metrology Institute, Czechia, EURAMET

GUM	Glowny Urzad Miar, Central Office of Measures, Poland, EURAMET

INMETRO

Instituto Nacional de Metrologia, Qualidade e Tecnologia, Brazil, SIM

IPQ	Instituto Portugues da Qualidade, Portugal, EURAMET

KRISS

Korea Research Institute of Standards and Science, Korea, Republic of, APMP

NIM	National Institute of Metrology, China, APMP

NMIA	National Measurement Institute, Australia, Australia, APMP

NMIJ AIST

National Metrology Institute of Japan, Japan, APMP

NMi-VSL

Nederlands Meetinstituut - Van Swinden Laboratorium (became VSL in 2009), Netherlands, EURAMET

NPL	National Physical Laboratory, United Kingdom, EURAMET

OMH	Országos Mérésügyi Hivatal; Subsequently MKEH, now BKFH, Hungary, EURAMET

SMU	Slovensky Metrologicky Ustav, Slovakia, EURAMET

VNIIM

D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

Key comparison CCQM-K23.b

MEASURAND : Amount-of-substance fraction of Nitrogen in Natural gas type II
NOMINAL VALUE : 0.07 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

Key comparison reference value: there is no single reference value for this comparison, the value obtained from preparation, x_{i ref}, is taken as the reference value for laboratory i.

The degree of equivalence of each laboratory i with respect to the reference value is given by a pair of terms: D_i = (x_Lab_i - x_{i ref}) and U_i, its expanded uncertainty at a 95% level of confidence, both expressed in 10^-2 mol/mol;
U_i = 2[(U_Labi / k_Labi)² + u_i_ref²]^1/2, using a coverage factor k = 2.
D_i and U_i are also given in relative terms.

The degree of equivalence between two laboratories i and j is given by a pair of terms: D_ij =(D_i - D_j) = (x_i - x_{i ref}) - (x_j - x_{j ref}) and U_ij, its expanded uncertainty at a 95% level of confidence, both expressed in 10^-2 mol/mol;
U_ij = 2[(U_Labi / k_Labi)² + (U_Labj / k_Labj)² + u_i_ref²+ u_{j ref}²]^1/2, using a coverage factor k = 2. The pair-wise degrees of equivalence are not explicitely computed.

Linking COOMET.QM-K23.b to CCQM-K23.b

The pilot laboratory VNIIM is used as the linking laboratory. In order to link the results of COOMET.QM-K23.b to those of CCQM-K23.b, an uncertainty term is added to the standard uncertainty of the reference value, u_i_ref, for the laboratory i participating in COOMET.QM-K23.b. This additional uncertainty term is equal to the absolute value of D_iobtained by VNIIM in CCQM-K23.b.

The degree of equivalence of each laboratory i participant in COOMET.QM-K23.b with respect to the reference value is given by a pair of terms: D_i = (x_Lab_i - x_{i ref}) and U_i, its expanded uncertainty (k = 2), both expressed in 10^-2 mol/mol:
U_i = [U_Labi² + 2u_i_ref²+ D_{VNIIM (CCQM-K23.b)}²]^1/2.
D_i and U_i are also given in relative terms.

No pair-wise degrees of equivalence have been computed for participants in COOMET.QM-K23.b.

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

Key comparison CCQM-K23.b

MEASURAND : Amount-of-substance fraction of Carbon dioxide in Natural gas type II
NOMINAL VALUE : 0.03 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

Key comparison reference value: there is no single reference value for this comparison, the value obtained from preparation, x_{i ref}, is taken as the reference value for laboratory i.

The degree of equivalence of each laboratory i with respect to the reference value is given by a pair of terms: D_i = (x_Lab_i - x_{i ref}) and U_i, its expanded uncertainty at a 95% level of confidence, both expressed in 10^-2 mol/mol;
U_i = 2[(U_Labi / k_Labi)² + u_i_ref²]^1/2, using a coverage factor k = 2.
D_i and U_i are also given in relative terms.

The degree of equivalence between two laboratories i and j is given by a pair of terms: D_ij =(D_i - D_j) = (x_i - x_{i ref}) - (x_j - x_{j ref}) and U_ij, its expanded uncertainty at a 95% level of confidence, both expressed in 10^-2 mol/mol;
U_ij = 2[(U_Labi / k_Labi)² + (U_Labj / k_Labj)² + u_i_ref²+ u_{j ref}²]^1/2, using a coverage factor k = 2. The pair-wise degrees of equivalence are not explicitely computed.

Linking COOMET.QM-K23.b to CCQM-K23.b

The pilot laboratory VNIIM is used as the linking laboratory. In order to link the results of COOMET.QM-K23.b to those of CCQM-K23.b, an uncertainty term is added to the standard uncertainty of the reference value, u_i_ref, for the laboratory i participating in COOMET.QM-K23.b. This additional uncertainty term is equal to the absolute value of D_iobtained by VNIIM in CCQM-K23.b.

The degree of equivalence of each laboratory i participant in COOMET.QM-K23.b with respect to the reference value is given by a pair of terms: D_i = (x_Lab_i - x_{i ref}) and U_i, its expanded uncertainty (k = 2), both expressed in 10^-2 mol/mol;
U_i = [U_Labi² + 2u_i_ref²+ D_{VNIIM (CCQM-K23.b)}²]^1/2.
D_i and U_i are also given in relative terms.

No pair-wise degrees of equivalence have been computed for participants in COOMET.QM-K23.b.

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

Key comparison CCQM-K23.b

MEASURAND : Amount-of-substance fraction of Ethane in Natural gas type II
NOMINAL VALUE : 0.094 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

Key comparison reference value: there is no single reference value for this comparison, the value obtained from preparation, x_{i ref}, is taken as the reference value for laboratory i.

The degree of equivalence of each laboratory i with respect to the reference value is given by a pair of terms: D_i = (x_Lab_i - x_{i ref}) and U_i, its expanded uncertainty at a 95% level of confidence, both expressed in 10^-2 mol/mol;
U_i = 2[(U_Labi / k_Labi)² + u_i_ref²]^1/2, using a coverage factor k = 2.
D_i and U_i are also given in relative terms.

The degree of equivalence between two laboratories i and j is given by a pair of terms: D_ij =(D_i - D_j) = (x_i - x_{i ref}) - (x_j - x_{j ref}) and U_ij, its expanded uncertainty at a 95% level of confidence, both expressed in 10^-2 mol/mol;
U_ij = 2[(U_Labi / k_Labi)² + (U_Labj / k_Labj)² + u_i_ref²+ u_{j ref}²]^1/2, using a coverage factor k = 2. The pair-wise degrees of equivalence are not explicitely computed.

Linking COOMET.QM-K23.b to CCQM-K23.b

The pilot laboratory VNIIM is used as the linking laboratory. In order to link the results of COOMET.QM-K23.b to those of CCQM-K23.b, an uncertainty term is added to the standard uncertainty of the reference value, u_i_ref, for the laboratory i participating in COOMET.QM-K23.b. This additional uncertainty term is equal to the absolute value of D_iobtained by VNIIM in CCQM-K23.b.

The degree of equivalence of each laboratory i participant in COOMET.QM-K23.b with respect to the reference value is given by a pair of terms: D_i = (x_Lab_i - x_{i ref}) and U_i, its expanded uncertainty (k = 2), both expressed in 10^-2 mol/mol:
U_i = [U_Labi² + 2u_i_ref²+ D_{VNIIM (CCQM-K23.b)}²]^1/2.
D_i and U_i are also given in relative terms.

No pair-wise degrees of equivalence have been computed for participants in COOMET.QM-K23.b.

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

Key comparison CCQM-K23.b

MEASURAND : Amount-of-substance fraction of Propane in Natural gas type II
NOMINAL VALUE : 0.034 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

Key comparison reference value: there is no single reference value for this comparison, the value obtained from preparation, x_{i ref}, is taken as the reference value for laboratory i.

The degree of equivalence of each laboratory i with respect to the reference value is given by a pair of terms: D_i = (x_Lab_i - x_{i ref}) and U_i, its expanded uncertainty at a 95% level of confidence, both expressed in 10^-2 mol/mol;
U_i = 2[(U_Labi / k_Labi)² + u_i_ref²]^1/2, using a coverage factor k = 2.
D_i and U_i are also given in relative terms.

The degree of equivalence between two laboratories i and j is given by a pair of terms: D_ij =(D_i - D_j) = (x_i - x_{i ref}) - (x_j - x_{j ref}) and U_ij, its expanded uncertainty at a 95% level of confidence, both expressed in 10^-2 mol/mol;
U_ij = 2[(U_Labi / k_Labi)² + (U_Labj / k_Labj)² + u_i_ref²+ u_{j ref}²]^1/2, using a coverage factor k = 2. The pair-wise degrees of equivalence are not explicitely computed.

Linking COOMET.QM-K23.b to CCQM-K23.b

The pilot laboratory VNIIM is used as the linking laboratory. In order to link the results of COOMET.QM-K23.b to those of CCQM-K23.b, an uncertainty term is added to the standard uncertainty of the reference value, u_i_ref, for the laboratory i participating in COOMET.QM-K23.b. This additional uncertainty term is equal to the absolute value of D_iobtained by VNIIM in CCQM-K23.b.

The degree of equivalence of each laboratory i participant in COOMET.QM-K23.b with respect to the reference value is given by a pair of terms: D_i = (x_Lab_i - x_{i ref}) and U_i, its expanded uncertainty (k = 2), both expressed in 10^-2 mol/mol:
U_i = [U_Labi² + 2u_i_ref²+ D_{VNIIM (CCQM-K23.b)}²]^1/2.
D_i and U_i are also given in relative terms.

No pair-wise degrees of equivalence have been computed for participants in COOMET.QM-K23.b.

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

Key comparison CCQM-K23.b

MEASURAND : Amount-of-substance fraction of iso-Butane in Natural gas type II
NOMINAL VALUE : 0.008 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

Key comparison reference value: there is no single reference value for this comparison, the value obtained from preparation, x_{i ref}, is taken as the reference value for laboratory i.

The degree of equivalence of each laboratory i with respect to the reference value is given by a pair of terms: D_i = (x_Lab_i - x_{i ref}) and U_i, its expanded uncertainty at a 95% level of confidence, both expressed in 10^-2 mol/mol;
U_i = 2[(U_Labi / k_Labi)² + u_i_ref²]^1/2, using a coverage factor k = 2.
D_i and U_i are also given in relative terms.

The degree of equivalence between two laboratories i and j is given by a pair of terms: D_ij =(D_i - D_j) = (x_i - x_{i ref}) - (x_j - x_{j ref}) and U_ij, its expanded uncertainty at a 95% level of confidence, both expressed in 10^-2 mol/mol;
U_ij = 2[(U_Labi / k_Labi)² + (U_Labj / k_Labj)² + u_i_ref²+ u_{j ref}²]^1/2, using a coverage factor k = 2. The pair-wise degrees of equivalence are not explicitely computed.

Linking COOMET.QM-K23.b to CCQM-K23.b

The pilot laboratory VNIIM is used as the linking laboratory. In order to link the results of COOMET.QM-K23.b to those of CCQM-K23.b, an uncertainty term is added to the standard uncertainty of the reference value, u_i_ref, for the laboratory i participating in COOMET.QM-K23.b. This additional uncertainty term is equal to the absolute value of D_iobtained by VNIIM in CCQM-K23.b.

The degree of equivalence of each laboratory i participant in COOMET.QM-K23.b with respect to the reference value is given by a pair of terms: D_i = (x_Lab_i - x_{i ref}) and U_i, its expanded uncertainty (k = 2), both expressed in 10^-2 mol/mol:
U_i = [U_Labi² + 2u_i_ref²+ D_{VNIIM (CCQM-K23.b)}²]^1/2.
D_i and U_i are also given in relative terms.

No pair-wise degrees of equivalence have been computed for participants in COOMET.QM-K23.b.

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

Key comparison CCQM-K23.b

MEASURAND : Amount-of-substance fraction of n-Butane in Natural gas type II
NOMINAL VALUE : 0.01 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

Key comparison reference value: there is no single reference value for this comparison, the value obtained from preparation, x_{i ref}, is taken as the reference value for laboratory i.

The degree of equivalence of each laboratory i with respect to the reference value is given by a pair of terms: D_i = (x_Lab_i - x_{i ref}) and U_i, its expanded uncertainty at a 95% level of confidence, both expressed in 10^-2 mol/mol;
U_i = 2[(U_Labi / k_Labi)² + u_i_ref²]^1/2, using a coverage factor k = 2.
D_i and U_i are also given in relative terms.

The degree of equivalence between two laboratories i and j is given by a pair of terms: D_ij =(D_i - D_j) = (x_i - x_{i ref}) - (x_j - x_{j ref}) and U_ij, its expanded uncertainty at a 95% level of confidence, both expressed in 10^-2 mol/mol;
U_ij = 2[(U_Labi / k_Labi)² + (U_Labj / k_Labj)² + u_i_ref²+ u_{j ref}²]^1/2, using a coverage factor k = 2. The pair-wise degrees of equivalence are not explicitely computed.

Linking COOMET.QM-K23.b to CCQM-K23.b

The pilot laboratory VNIIM is used as the linking laboratory. In order to link the results of COOMET.QM-K23.b to those of CCQM-K23.b, an uncertainty term is added to the standard uncertainty of the reference value, u_i_ref, for the laboratory i participating in COOMET.QM-K23.b. This additional uncertainty term is equal to the absolute value of D_iobtained by VNIIM in CCQM-K23.b.

The degree of equivalence of each laboratory i participant in COOMET.QM-K23.b with respect to the reference value is given by a pair of terms: D_i = (x_Lab_i - x_{i ref}) and U_i, its expanded uncertainty (k = 2), both expressed in 10^-2 mol/mol:
U_i = [U_Labi² + 2u_i_ref²+ D_{VNIIM (CCQM-K23.b)}²]^1/2.
D_i and U_i are also given in relative terms.

No pair-wise degrees of equivalence have been computed for participants in COOMET.QM-K23.b.

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

Key comparison CCQM-K23.b

MEASURAND : Amount-of-substance fraction of Methane in Natural gas type II
NOMINAL VALUE : 0.754 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

Key comparison reference value: there is no single reference value for this comparison, the value obtained from preparation, x_{i ref}, is taken as the reference value for laboratory i.

The degree of equivalence of each laboratory i with respect to the reference value is given by a pair of terms: D_i = (x_Lab_i - x_{i ref}) and U_i, its expanded uncertainty at a 95% level of confidence, both expressed in 10^-2 mol/mol;
U_i = 2[(U_Labi / k_Labi)² + u_i_ref²]^1/2, using a coverage factor k = 2.
D_i and U_i are also given in relative terms.

The degree of equivalence between two laboratories i and j is given by a pair of terms: D_ij =(D_i - D_j) = (x_i - x_{i ref}) - (x_j - x_{j ref}) and U_ij, its expanded uncertainty at a 95% level of confidence, both expressed in 10^-2 mol/mol;
U_ij = 2[(U_Labi / k_Labi)² + (U_Labj / k_Labj)² + u_i_ref²+ u_{j ref}²]^1/2, using a coverage factor k = 2. The pair-wise degrees of equivalence are not explicitely computed.

Linking COOMET.QM-K23.b to CCQM-K23.b

The pilot laboratory VNIIM is used as the linking laboratory. In order to link the results of COOMET.QM-K23.b to those of CCQM-K23.b, an uncertainty term is added to the standard uncertainty of the reference value, u_i_ref, for the laboratory i participating in COOMET.QM-K23.b. This additional uncertainty term is equal to the absolute value of D_iobtained by VNIIM in CCQM-K23.b.

The degree of equivalence of each laboratory i participant in COOMET.QM-K23.b with respect to the reference value is given by a pair of terms: D_i = (x_Lab_i - x_{i ref}) and U_i, its expanded uncertainty (k = 2), both expressed in 10^-2 mol/mol:
U_i = [U_Labi² + 2u_i_ref²+ D_{VNIIM (CCQM-K23.b)}²]^1/2.
D_i and U_i are also given in relative terms.

No pair-wise degrees of equivalence have been computed for participants in COOMET.QM-K23.b.

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

Key comparison CCQM-K23.b

MEASURAND : Amount-of-substance fraction of Nitrogen in Natural gas type II
NOMINAL VALUE : 0.07 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

x_Labi : result of measurement carried out by laboratory i
U_Labi : stated uncertainty of laboratory i at a 95 % level of confidence
k_Labi : stated coverage factor
x_{i ref} : amount-of-substance fraction in the cylinder sent to laboratory i, from preparation
u_{i ref} : combined standard uncertainty of x_i_ref

u_{i ref} = (u_{i prep}² + u_{i ver}²)^1/2 where u_{i prep} and u_{i ver} are the standard uncertainties of preparation and verification respectively for which the numerical values can be found in Table 5 of the Final Report.

Key comparison COOMET.QM-K23.b

MEASURAND : Amount-of-substance fraction of Nitrogen in Natural gas
NOMINAL VALUE : 0.07 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.095, Propane: 0.035, n-Butane: 0.01, i-Butane: 0.008, Methane: balance

x_Labi : result of measurement carried out by laboratory i participant in COOMET.QM-K23.b
U_Labi : expanded uncertainty of laboratory i participant in COOMET.QM-K23.b at a 95% level of confidence
k_Labi : stated coverage factor
x_{i ref} : amount-of-substance fraction in the cylinder sent to laboratory i participant in COOMET.QM-K23.b, from preparation
u_{i ref} : combined standard uncertainty of x_i_ref
u_{i ref} = (u_{i prep}² + u_{i ver}²)^1/2 where u_{i prep} and u_{i ver} are the standard uncertainties of preparation and verification respectively

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

Key comparison CCQM-K23.b

MEASURAND : Amount-of-substance fraction of Carbon dioxide in Natural gas type II
NOMINAL VALUE : 0.03 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

x_Labi : result of measurement carried out by laboratory i
U_Labi : stated uncertainty of laboratory i at a 95 % level of confidence
k_Labi : stated coverage factor
x_{i ref} : amount-of-substance fraction in the cylinder sent to laboratory i, from preparation
u_{i ref} : combined standard uncertainty of x_i_ref

u_{i ref} = (u_{i prep}² + u_{i ver}²)^1/2 where u_{i prep} and u_{i ver} are the standard uncertainties of preparation and verification respectively for which the numerical values can be found in Table 6 of the Final Report.

Key comparison COOMET.QM-K23.b

MEASURAND : Amount-of-substance fraction of Carbon dioxide in Natural gas
NOMINAL VALUE : 0.03 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.095, Propane: 0.035, n-Butane: 0.01, i-Butane: 0.008, Methane: balance

x_Labi : result of measurement carried out by laboratory i participant in COOMET.QM-K23.b
U_Labi : expanded uncertainty of laboratory i participant in COOMET.QM-K23.b at a 95% level of confidence
k_Labi : stated coverage factor
x_{i ref} : amount-of-substance fraction in the cylinder sent to laboratory i participant in COOMET.QM-K23.b, from preparation
u_{i ref} : combined standard uncertainty of x_i_ref
u_{i ref} = (u_{i prep}² + u_{i ver}²)^1/2 where u_{i prep} and u_{i ver} are the standard uncertainties of preparation and verification respectively

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

Key comparison CCQM-K23.b

MEASURAND : Amount-of-substance fraction of Ethane in Natural gas type II
NOMINAL VALUE : 0.094 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

x_Labi : result of measurement carried out by laboratory i
U_Labi : stated uncertainty of laboratory i at a 95 % level of confidence
k_Labi : stated coverage factor
x_{i ref} : amount-of-substance fraction in the cylinder sent to laboratory i, from preparation
u_{i ref} : combined standard uncertainty of x_i_ref

u_{i ref} = (u_{i prep}² + u_{i ver}²)^1/2 where u_{i prep} and u_{i ver} are the standard uncertainties of preparation and verification respectively for which the numerical values can be found in Table 7 of the Final Report.

Key comparison COOMET.QM-K23.b

MEASURAND : Amount-of-substance fraction of Ethane in Natural gas
NOMINAL VALUE : 0.095 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.095, Propane: 0.035, n-Butane: 0.01, i-Butane: 0.008, Methane: balance

x_Labi : result of measurement carried out by laboratory i participant in COOMET.QM-K23.b
U_Labi : expanded uncertainty of laboratory i participant in COOMET.QM-K23.b at a 95% level of confidence
k_Labi : stated coverage factor
x_{i ref} : amount-of-substance fraction in the cylinder sent to laboratory i participant in COOMET.QM-K23.b, from preparation
u_{i ref} : combined standard uncertainty of x_i_ref
u_{i ref} = (u_{i prep}² + u_{i ver}²)^1/2 where u_{i prep} and u_{i ver} are the standard uncertainties of preparation and verification respectively

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

Key comparison CCQM-K23.b

MEASURAND : Amount-of-substance fraction of Propane in Natural gas type II
NOMINAL VALUE : 0.034 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

x_Labi : result of measurement carried out by laboratory i
U_Labi : stated uncertainty of laboratory i at a 95 % level of confidence
k_Labi : stated coverage factor
x_{i ref} : amount-of-substance fraction in the cylinder sent to laboratory i, from preparation
u_{i ref} : combined standard uncertainty of x_i_ref

u_{i ref} = (u_{i prep}² + u_{i ver}²)^1/2 where u_{i prep} and u_{i ver} are the standard uncertainties of preparation and verification respectively for which the numerical values can be found in Table 8 of the Final Report.

Key comparison COOMET.QM-K23.b

MEASURAND : Amount-of-substance fraction of Propane in Natural gas
NOMINAL VALUE : 0.035 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.095, Propane: 0.035, n-Butane: 0.01, i-Butane: 0.008, Methane: balance

x_Labi : result of measurement carried out by laboratory i participant in COOMET.QM-K23.b
U_Labi : expanded uncertainty of laboratory i participant in COOMET.QM-K23.b at a 95% level of confidence
k_Labi : stated coverage factor
x_{i ref} : amount-of-substance fraction in the cylinder sent to laboratory i participant in COOMET.QM-K23.b, from preparation
u_{i ref} : combined standard uncertainty of x_i_ref
u_{i ref} = (u_{i prep}² + u_{i ver}²)^1/2 where u_{i prep} and u_{i ver} are the standard uncertainties of preparation and verification respectively

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

Key comparison CCQM-K23.b

MEASURAND : Amount-of-substance fraction of iso-Butane in Natural gas type II
NOMINAL VALUE : 0.008 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

x_Labi : result of measurement carried out by laboratory i
U_Labi : stated uncertainty of laboratory i at a 95 % level of confidence
k_Labi : stated coverage factor
x_{i ref} : amount-of-substance fraction in the cylinder sent to laboratory i, from preparation
u_{i ref} : combined standard uncertainty of x_i_ref

u_{i ref} = (u_{i prep}² + u_{i ver}²)^1/2 where u_{i prep} and u_{i ver} are the standard uncertainties of preparation and verification respectively for which the numerical values can be found in Table 9 of the Final Report.

Key comparison COOMET.QM-K23.b

MEASURAND : Amount-of-substance fraction of iso-Butane in Natural gas
NOMINAL VALUE : 0.008 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.095, Propane: 0.035, n-Butane: 0.01, i-Butane: 0.008, Methane: balance

x_Labi : result of measurement carried out by laboratory i participant in COOMET.QM-K23.b
U_Labi : expanded uncertainty of laboratory i participant in COOMET.QM-K23.b at a 95% level of confidence
k_Labi : stated coverage factor
x_{i ref} : amount-of-substance fraction in the cylinder sent to laboratory i participant in COOMET.QM-K23.b, from preparation
u_{i ref} : combined standard uncertainty of x_i_ref
u_{i ref} = (u_{i prep}² + u_{i ver}²)^1/2 where u_{i prep} and u_{i ver} are the standard uncertainties of preparation and verification respectively

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

Key comparison CCQM-K23.b

MEASURAND : Amount-of-substance fraction of n-Butane in Natural gas type II
NOMINAL VALUE : 0.01 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

x_Labi : result of measurement carried out by laboratory i
U_Labi : stated uncertainty of laboratory i at a 95 % level of confidence
k_Labi : stated coverage factor
x_{i ref} : amount-of-substance fraction in the cylinder sent to laboratory i, from preparation
u_{i ref} : combined standard uncertainty of x_i_ref

u_{i ref} = (u_{i prep}² + u_{i ver}²)^1/2 where u_{i prep} and u_{i ver} are the standard uncertainties of preparation and verification respectively for which the numerical values can be found in Table 10 of the Final Report.

Key comparison COOMET.QM-K23.b

MEASURAND : Amount-of-substance fraction of n-Butane in Natural gas
NOMINAL VALUE : 0.01 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.095, Propane: 0.035, n-Butane: 0.01, i-Butane: 0.008, Methane: balance

x_Labi : result of measurement carried out by laboratory i participant in COOMET.QM-K23.b
U_Labi : expanded uncertainty of laboratory i participant in COOMET.QM-K23.b at a 95% level of confidence
k_Labi : stated coverage factor
x_{i ref} : amount-of-substance fraction in the cylinder sent to laboratory i participant in COOMET.QM-K23.b, from preparation
u_{i ref} : combined standard uncertainty of x_i_ref
u_{i ref} = (u_{i prep}² + u_{i ver}²)^1/2 where u_{i prep} and u_{i ver} are the standard uncertainties of preparation and verification respectively

CCQM-K23.b and COOMET.QM-K23.b were placed in the KCDB archives on 14 November 2023

Key comparison CCQM-K23.b

MEASURAND : Amount-of-substance fraction of Methane in Natural gas type II
NOMINAL VALUE : 0.754 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.094, Propane: 0.034, n-Butane: 0.01, i-Butane: 0.008, Methane: 0.754

x_Labi : result of measurement carried out by laboratory i
U_Labi : stated uncertainty of laboratory i at a 95 % level of confidence
k_Labi : stated coverage factor
x_{i ref} : amount-of-substance fraction in the cylinder sent to laboratory i, from preparation
u_{i ref} : combined standard uncertainty of x_i_ref

u_{i ref} = (u_{i prep}² + u_{i ver}²)^1/2 where u_{i prep} and u_{i ver} are the standard uncertainties of preparation and verification respectively for which the numerical values can be found in Table 11 of the Final Report.

Key comparison COOMET.QM-K23.b

MEASURAND : Amount-of-substance fraction of Methane in Natural gas
NOMINAL VALUE : 0.754 mol/mol
GAS MIXTURE : Expressed in mol/mol: Nitrogen: 0.07, Carbon dioxide: 0.03, Ethane: 0.095, Propane: 0.035, n-Butane: 0.01, i-Butane: 0.008, Methane: balance

x_Labi : result of measurement carried out by laboratory i participant in COOMET.QM-K23.b
U_Labi : expanded uncertainty of laboratory i participant in COOMET.QM-K23.b at a 95% level of confidence
k_Labi : stated coverage factor
x_{i ref} : amount-of-substance fraction in the cylinder sent to laboratory i participant in COOMET.QM-K23.b, from preparation
u_{i ref} : combined standard uncertainty of x_i_ref
u_{i ref} = (u_{i prep}² + u_{i ver}²)^1/2 where u_{i prep} and u_{i ver} are the standard uncertainties of preparation and verification respectively