CCQM-K1.b was placed in the KCDB archives on 18 September 2023

CCQM-K1.c, EUROMET.QM-K1.c and APMP.QM-K1.c

MEASURAND : Amount-of-substance fraction of Nitrogen monoxide in Nitrogen
NOMINAL VALUE : 100 µmol/mol

Degrees of equivalence Di and expanded uncertainty Ui (k = 2) expressed in µmol/mol

Red diamonds: participants in CCQM-K1.c
Green triangles: participants in EUROMET.QM-K1.c
Blue circles: participants in APMP.QM-K1.c

CCQM-K1.b was placed in the KCDB archives on 18 September 2023

MEASURAND : Amount-of-substance fraction of Nitrogen monoxide in Nitrogen
NOMINAL VALUE : 1000 µmol/mol

Degrees of equivalence Di and expanded uncertainty Ui (k = 2) expressed in µmol/mol

*At the time of the comparison, NMIJ (National Metrology Institute of Japan) was designated as NRLM (National Research Laboratory of Metrology).

CCQM-K1.b was placed in the KCDB archives on 18 September 2023

CCQM-K1.c, EUROMET.QM-K1.c and APMP.QM-K1.c

MEASURAND : Amount-of-substance fraction of Nitrogen monoxide in Nitrogen
NOMINAL VALUE : 100 µmol/mol

Full set of degrees of equivalence, using laboratory acronyms as on January 2010:

In dark blue: participants in CCQM-K1.c
In green: participants in EUROMET.QM-K1.c
In blue: participants in APMP.QM-K1.c

Complete Matrix of Equivalence for CCQM-K1.c and EUROMET.QM-K1.c, using the acronyms of laboratories as they were at the time of those key comparisons:

 

 

     
Lab i Di Ui
  / (µmol/mol) / (µmol/mol)
NPL -0.07 0.40
NIST 0.11 0.53
NMi-VSL 0.00 0.40
BNM-LNE -0.03 0.08
KRISS 0.77 0.70
NRLM 0.24 0.50
NRCCRM 5.64 1.06
VNIIM 1.63 1.00
OMH 0.52 1.01
BNM-LNE 0.01 0.66
NPL 0.11 0.32
VNIIM 1.55 0.91
NMi-VSL 0.07 0.32
GUM 0.63 1.51
CEM 0.57 0.91
METAS 0.28 0.44
CHMI -0.19 1.61
FMI -0.36 1.51
IPQ 0.10 0.41

 

 

In green: participants in EUROMET.QM-K1.c, also indicated by ** in the "Lab j" list.

 

Results are available in Summary results (.PDF file, A4 printable format).

 

CCQM-K1.b was placed in the KCDB archives on 18 September 2023

MEASURAND : Amount-of-substance fraction of Nitrogen monoxide in Nitrogen
NOMINAL VALUE : 1000 µmol/mol

 

 

     
Lab i Di Ui
  / (µmol/mol) / (µmol/mol)
NPL 2.23 3.01
NIST -0.20 4.70
NMi -0.60 3.00
BNM-LNE 0.10 1.41
KRISS -0.20 2.20
NRLM* 2.10 5.01
NRCCRM 46.20 10.47
VNIIM 5.90 7.95
OMH 3.80 4.02

 

 

*At the time of the comparison, NMIJ (National Metrology Institute of Japan) was designated as NRLM (National Research Laboratory of Metrology).

The full matrix of equivalence is available in Summary Results (.PDF file, results presented under a printable A4 format).

 

Comparison
Comparison close
CC comparison
Linked comparison
APMP.QM-K1.c
Metrology area, Sub-field Chemistry and Biology, Gases
Description Exhaust emission gases: Nitrogen monoxide in Nitrogen
Time of measurements 2005 - 2006
Status Approved for equivalence
Final Reports of the comparisons
Measurand Amount-of-substance fraction of NO in N2: 100 µmol/mol
Transfer device Calibrated gas cylinders
Comparison type Key Comparison
Consultative Committee CCQM (Consultative Committee for Amount of Substance)
Conducted by APMP (Asia Pacific Metrology Programme)
Comments

EUROMET.QM-K1.c and APMP.QM-K1.c results are linked to those of CCQM-K1.c for 100 µmol/mol

APMP.QM-K1.c results published on 04 January 2010

Nitrogen monoxide (NO) in Nitrogen (N2)

Pilot institute KRISS
Korea Research Institute of Standards and Science
Korea, Republic of
Contact person Sang Hyub Oh

+82 42 868 5341
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
Pilot laboratory
KRISS

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

NIM

National Institute of Metrology, China, APMP

CCQM-K1.b was placed in the KCDB archives on 18 September 2023

CCQM-K1.c, EUROMET.QM-K1.c and APMP.QM-K1.c

MEASURAND : Amount-of-substance fraction of Nitrogen monoxide in Nitrogen
NOMINAL VALUE : 100 µmol/mol

  • Key comparison CCQM-K1.c

 

Key comparison reference value: there is no single reference value for this comparison, the value xigrav is taken as the 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: Di = (xi - xigrav) and Ui, its expanded uncertainty (k = 2), both expressed in µmol/mol, Ui = 2(ui2 + uigrav2)1/2.

 

 

The degree of equivalence between two laboratories is given by a pair of terms:
Dij = Di - Dj = (xi - xigrav) - (xj - xjgrav) and Uij, its expanded uncertainty
(k = 2), both expressed in µmol/mol,

Uij = 2(ui2 + uj2 + uigrav2 + ujgrav2)1/2.

 

  • Key comparison EUROMET.QM-K1.c

 

The gravimetric value xigrav-EUR is taken as the reference value for laboratory i participant in EUROMET.QM-K1.c.
The degree of equivalence of laboratory i participant in EUROMET.QM-K1.c with respect to the reference value is given by a pair of terms:
Di-EUR = (xi-EUR - xigrav-EUR) and Ui-EUR, its expanded uncertainty (k = 2), both expressed in µmol/mol,
Ui-EUR = 2(ui-EUR2 + uigrav-EUR2)1/2.

 

  • Linking EUROMET.QM-K1.c to CCQM-K1.c

NMi-VSL acted as the pilot laboratory in both key comparisons, EUROMET.QM-K1.c and CCQM-K1.c. The results of the laboratories having participated in both comparisons (NMi-VSL, NPL, BNM-LNE, and VNIIM) are given in the following table, except those of VNIIM that deviated significantly from the key comparison reference value.

Since the results of the three laboratories agree with the reference values within the claimed uncertainties in both comparisons, they provide some validation that the gravimetric values act as valid reference values.
It follows that:

 

The degrees of equivalence relative to the reference value obtained in EUROMET.QM-K1.c are transferred to CCQM-K1.c without correction:
Di = Di-EUR and Ui = Ui-EUR

 

 

The degree of equivalence between two laboratories i and j participating in CCQM-K1.c or in EUROMET.QM-K1.c is given by a pair of terms:
Dij =(Di - Dj) and Uij, its expanded uncertainty (k = 2), both expressed in µmol/mol,
Uij = 2(ui2 + uj2 + uigrav2 + ujgrav2)1/2
, with index "-EUR" when necessary.

 

These statements make it possible to extend the CCQM-K1.c matrix of equivalence to all participants in EUROMET.QM-K1.c.

 

 

  • Linking APMP.QM-K1.c to CCQM-K1.c

In order to link the APMP.QM-K1.c results to those of CCQM-K1.c, a small uncertainty term is added to the uncertainty of the gravimetric value delivered by KRISS for the transfer standard. The gravimetric value used to calculate the degrees of equivalence is equal to 97.94 µmol/mol with standard uncertainty 0.40 µmol/mol.

No pair-wise degrees of equivalence are computed from the APMP.QM-K1.c results.

CCQM-K1.b was placed in the KCDB archives on 18 September 2023

MEASURAND : Amount-of-substance fraction of Nitrogen monoxide in Nitrogen
NOMINAL VALUE : 1000 µmol/mol

 

Key comparison reference value: there is no single reference value for this comparison, the value xigrav is taken as the 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: Di = (xi - xigrav) and Ui, its expanded uncertainty (k = 2), both expressed in µmol/mol, Ui = 2(ui2 + uigrav2)1/2.

 

 

The degree of equivalence between two laboratories is given by a pair of terms:
Dij = Di - Dj = (xi - xigrav) - (xj - xjgrav) and Uij, its expanded uncertainty
(k = 2), both expressed in µmol/mol,
Uij = 2(ui2 + uj2 + uigrav2 + ujgrav2)1/2.

 

CCQM-K1.b was placed in the KCDB archives on 18 September 2023

CCQM-K1.c, EUROMET.QM-K1.c and APMP.QM-K1.c

MEASURAND : Amount-of-substance fraction of Nitrogen monoxide in Nitrogen
NOMINAL VALUE : 100 µmol/mol

  • Key comparison CCQM-K1.c

xi : result of measurement carried out by laboratory i
ui : combined standard uncertainty of xi
xigrav
: gravimetric value of the NO amount-of-substance fraction in the cylinder received by laboratory i
ui
grav : combined standard uncertainty of xigrav

 

 Lab i xi
/ (µmol/mol)
ui
/ (µmol/mol)

xigrav
/ (µmol/mol)

uigrav
/ (µmol/mol)
Date of measure
           
 NPL 100.00 0.20 100.070 0.007 Feb 96
 NIST 100.20 0.27 100.090 0.007 Jun 95
 NMi-VSL* 100.10 0.20 100.100 0.007 Apr 95
 BNM-LNE* 100.08 0.04 100.110 0.007 Jan 96
 KRISS 100.90 0.35 100.130 0.007 Mar 95
 NRLM* 100.39 0.25 100.150 0.007 Mar 95
 NRCCRM* 105.80 0.53 100.160 0.007 Apr 95
 VNIIM 101.80 0.50 100.170 0.007 Apr 95
 OMH*

100.70

0.50

100.180

0.007

Jun 95

 

*At the time of the comparison, VSL (Netherlands) was designated as NMi-VSL; LNE (France) as BNM-LNE; NMIJ (Japan) as NRLM; NIM (China) as NRCCRM; and MKEH (Hungary) as OMH.

 

 

  • Key comparison EUROMET.QM-K1.c

xi-EUR : result of measurement carried out by laboratory i
ui-EUR : combined standard uncertainty of xi-EUR
xigrav-EUR : gravimetric value of the NO amount-of-substance fraction in the cylinder received by laboratory i
uigrav-EUR : combined standard uncertainty of xigrav-EUR

 

 Lab i xi-EUR
/ (µmol/mol)
ui-EUR
/ (µmol/mol)

xigrav-EUR
/ (µmol/mol)

uigrav-EUR
/ (µmol/mol)
Date of measure
           
 BNM-LNE* 95.08 0.33 95.070 0.062 Aug 02
 NPL 95.2 0.15 95.094 0.062 Jul 02
 VNIIM 96.6 0.45 95.055 0.062 Nov 02
 NMi-VSL* 94.8 0.15 94.732 0.062 Sep 02
 GUM 95.8 0.75 95.172 0.062 Jan 03
 CEM 95.8 0.45 95.228 0.062 Sep 02
 METAS 95.12 0.21 94.843 0.062 Sep 02
 CHMI 94.87 0.80 95.064 0.062 Sep 02
 FMI

94.8

0.75

95.158

0.062

Sep 02

 IPQ

95.22

0.20

95.120

0.062

Jul 02

 

*At the time of the comparison, LNE (France) was designated as BNM-LNE, and VSL (Netherlands) as NMi-VSL.

  • Key comparison APMP.QM-K1.c

xi-APMP : result of measurement carried out by laboratory i
ui-APMP : combined standard uncertainty of xi-APMP

 

 Lab i xi-APMP
/ (µmol/mol)
ui-APMP
/ (µmol/mol)
Date of measure
       
 NIM 99.07 0.50 Jun 06
 KRISS 97.88 0.11 Aug 06

 

Gravimetric value of the transfer cylinder prepared by KRISS: 97.94 µmol/mol, with a standard uncertainty of 0.1 µmol/mol.

 

CCQM-K1.b was placed in the KCDB archives on 18 September 2023

MEASURAND : Amount-of-substance fraction of Nitrogen monoxide in Nitrogen
NOMINAL VALUE : 1000 µmol/mol

xi : result of measurement carried out by laboratory i
ui : combined standard uncertainty of xi
xigrav : gravimetric value of the NO amount-of-substance fraction in the cylinder received by laboratory i
uigrav : combined standard uncertainty of xigrav

 

 Lab i xi
/ (µmol/mol)
ui
/ (µmol/mol)

xigrav
/ (µmol/mol)

uigrav
/ (µmol/mol)
Date of measure
           
 NPL 1002.0 1.5 999.77 0.06 Jan 96
 NIST 999.8 2.3 1000.00 0.06 Jun 95
 NMi-VSL 1000.0 1.5 1000.60 0.06 Apr 95
 BNM-LNE 1000.2 0.7 1000.10 0.06 Jan 96
 KRISS 1000.1 1.1 1000.30 0.06 Mar 95
 NRLM* 1002.6 2.5 1000.50 0.06 Mar 95
 NRCCRM 1047.0 5.2 1000.80 0.06 Apr 95
 VNIIM 1006.8 4.0 1000.90 0.06 Apr 95
 OMH

1005.0

2.0

1001.20

0.06

Jun 95

 

*At the time of the comparison, NMIJ (National Metrology Institute of Japan) was designated as NRLM (National Research Laboratory of Metrology).