Comparison Display

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CCQM-K120

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

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CCQM-K120 and COOMET.QM-K120

MEASURAND Carbon dioxide amount fraction in air

NOMINAL VALUE 480 µmol/mol

Degrees of equivalence represented by D_i = (x_I - x_R) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in µmol/mol. n COOMET.QM-K120, x_R is provided from VNIIM from CCQM-K120.

480 µmol/mol

D_i /µmol/mol

Participating institutes

Linking of COOMET.QM-K120 to CCQM-K120 has been provided by VNIIM.

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CCQM-K120 and COOMET.QM-K120

MEASURAND Carbon dioxide amount fraction in air

NOMINAL VALUE 800 µmol/mol

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

480 µmol/mol

D_i /µmol/mol

Participating institutes

VNIIM provided the link between CCQM-K120 and COOMET.QM-K120.

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CCQM-K120

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).

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CCQM-K120 and COOMET.QM-K120

MEASURAND Carbon dioxide amount fraction in air

NOMINAL VALUE 480 µmol/mol

Degrees of equivalence represented by D_i = (x_I - x_R,_i) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in µmol/mol. n COOMET.QM-K120, x_R is provided from VNIIM from CCQM-K120.

LAB_i	D_i	U_neg,i	U_pos,i
	µmol/mol	µmol/mol	µmol/mol
GUM	0.39	5.20
INRIM	0.29	1.64
KRISS	0.15	0.23
LNE	0.20	1.01
NIM	-0.05	0.30
NMIJ	-0.05	0.20
NMISA	0.46	1.61
NOAA	-0.10	0.28
NPL	0.04	0.26
VNIIM	0.04	0.18
VSL	-0.04	0.37
UME	-0.12	0.30
BFKH	14.99	2.12
NIST	-0.87	0.45
NPLI	-0.34	3.04
BelGIM	0.20	0.70
KazStandart	0.02	2.43
NMC, A*STAR	-0.32	0.77
SE "Ukrmetrteststandart"	1.91	0.97
VNIIM	0.035	0.175

Participating institutes

CCQM-K120

COOMET.QM-K120

The linking of the COOMET.QM-K120 to CCQM-K120 has been provided by VNIIM.

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CCQM-K120 and COOMET.QM-K120

MEASURAND Carbon dioxide amount fraction in air

NOMINAL VALUE 800 µmol/mol

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

LAB_i	D_i	U_neg,i	U_pos,i
	µmol/mol	µmol/mol	µmol/mol
GUM	0.40	8.60
INRIM	0.51	2.61
KRISS	0.28	0.46
LNE	0.10	1.71
NIM	-0.04	0.24
NMIJ	-0.04	0.45
NMISA	0.91	1.03
NOAA	0.03	0.25
NPL	-0.38	0.71
VNIIM	-0.16	0.40
VSL	-0.60	0.70
UME	-0.53	0.67
BFKH	0.02	2.91
NIST	-0.98	1.11
NPLI	1.88	5.05
BelGIM	-0.54	1.35
KazStandart	0.02	4.05
NMC, A*STAR	0.04	1.1
SE "Ukrmetrteststandart"	2.19	1.44
VNIIM	0.033	0.253

Participating institutes

CCQM-K120

COOMET.QM-K120

The VNIIM prided the link between CCQM-K120 and COOMET.QM-K120.

Comparison

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COOMET.QM-K120

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Information & contact
Participants

Metrology area, Sub-field	Chemistry and Biology, Gases
Description	Carbon dioxide in air
Time of measurements	2019 - 2020
Status	Approved for equivalence

Final Reports of the comparisons	Metrologia 2023 60 Tech. Suppl. 08005
References	COOMET.QM-K120 Technical Protocol
Measurand	Mole fraction of carbon dioxide in air Nominal values : 480 µmol/mol and 800 µmol/mol
Transfer device	Two high pressure cylinders at the nominal mole fractions

Comparison type	Key Comparison
Consultative Committee	CCQM (Consultative Committee for Amount of Substance)
Conducted by	COOMET (Euro-Asian Cooperation of National Metrological Institutions)
RMO Internal Identifier	COOMET Project 772/RU/18
Pilot institute	VNIIM D.I. Mendeleyev Institute for Metrology, Rosstandart Russian Federation
Contact person	Leonid Konopelko +7 812 315 11 45

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

BelGIM

Belarussian State Institute for Metrology, Belarus, COOMET

KazStandard

Kazakhstan Institute of Standardization and Metrology, Kazakhstan, COOMET

NMC, A*STAR

National Metrology Centre, Agency for Science, Technology and Research, Singapore, APMP

SE "Ukrmetrteststandard"

State Enterprise "Ukrmetrteststandard", Ukraine, EURAMET

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CCQM-K120

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_ref²)^1/2.

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CCQM-K120 and COOMET.QM-K120

MEASURAND Carbon dioxide amount fraction in air

NOMINAL VALUE 480 µmol/mol

There is no single reference value for CCQM-K120. 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_i² - u_i_ref²)^1/2.

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

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CCQM-K120 and COOMET.QM-K120

MEASURAND Carbon dioxide amount fraction in air

NOMINAL VALUE 800 µmol/mol

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CCQM-K120

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

* 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 Carbon dioxide amount fraction in air

NOMINAL VALUE 480 µmol/mol

CCQM-K120


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


	Lab_i	Cylinder	x_i	u_Lab_i	x_i_ref	u_i_ref
	Lab_i	Cylinder	µmol/mol	µmol/mol	µmol/mol	µmol/mol
	GUM	D298393	478.1	2.6	477.706	0.051
	INRIM	D247440	479.3	0.8	479.007	0.173
	KRISS	D500647	480	0.1	479.851	0.052
	LNE	1029047	477.6	0.5	477.397	0.061
	NIM	FB03744	489.15	0.11	489.202	0.099
	NMIJ	CPC00494	471.301	0.026**	471.351	0.094
	NMISA	M518167	479.5	0.8	479.042	0.068
	NOAA	CC305198	479.26	0.13	479.363	0.058
	NPL	2170	480.02	0.12	479.985	0.049
	VNIIM	M365664	480.18	0.065**	480.145	0.059
	VSL	5604880	480.48	0.18	480.523	0.045
	UME	PSM266468	480.42	0.125*	480.537	0.078
	BFKH	OMH44	479.9	1.05	464.911	0.138
	NIST	FB04300	472.662	0.214	473.529	0.071
	NPLI	JJ108862	480.52	1.52	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

MEASURAND Carbon dioxide amount fraction in air

NOMINAL VALUE 480 µmol/mol

COOMET.QM-K120
Lab_i	x_i	u_i
Lab_i	µmol/mol	µmol/mol
BelGIM	482.4	0.3
KazStandart	486.8	1.2
NMC, A*STAR	479.87	0.34
SE "Ukrmetrteststandart"	480.3	0.45
VNIIM	480.18	0.065

The measurement results are listed in Appendix I of the COOMET.QM-K120 Final Report.

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CCQM-K120 and COOMET.QM-K120

MEASURAND Carbon dioxide amount fraction in air

NOMINAL VALUE 800 µmol/mol

CCQM-K120

	Lab_i	Cylinder	x_i	u_Lab_i	x_i_ref	u_i_ref
	Lab_i	Cylinder	µmol/mol	µmol/mol	µmol/mol	µmol/mol
	GUM	D298402	800.5	4.3	800.105	0.106
	INRIM	D247445	798.9	1.3	798.389	0.128
	KRISS	D500672	800.8	0.2	800.519	0.118
	LNE	1029048	802.2	0.85	802.099	0.078
	NMIJ	CPC00558	803.658	0.039**	803.694	0.114
	NPL	2181	799.7	0.2	799.744	0.101
	NMISA	M518244	799.1	0.5	798.187	0.132
	VNIIM	M365707	800.73	0.095	800.697	0.084
	VSL	5604705	795.7	0.3	796.08	0.191
	UME	PSM298347	800.76	0.180*	800.917	0.083
	NIM	FB03748	809.82	0.13	810.424	0.327
	NOAA	CB11668	794.08	0.24	794.608	0.237
	BFKH	OHM69	800.3	1.45	800.282	0.1
	NIST	FB04287	794.53	0.514	795.511	0.208
	NPLI	JJ108854	796.38	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


Lab_i	x_i	u(x_i)
Lab_i	µmol/mol	µmol/mol
BelGIM	802.6	0.6
KAZINMETR	799.4	2
NMC, A*STAR	799.37	0.45
Ukrmetrteststandart	800	0.65
VNIIM	800.73	0.095

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Key and supplementary comparisons - Print out