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

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.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 iDiUi
 / (µmol/mol)/ (µmol/mol)
NPL-0.070.40
NIST0.110.53
NMi-VSL0.000.40
BNM-LNE-0.030.08
KRISS0.770.70
NRLM0.240.50
NRCCRM5.641.06
VNIIM1.631.00
OMH0.521.01
BNM-LNE0.010.66
NPL0.110.32
VNIIM1.550.91
NMi-VSL0.070.32
GUM0.631.51
CEM0.570.91
METAS0.280.44
CHMI-0.191.61
FMI-0.361.51
IPQ0.100.41

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).

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

   
Lab iDiUi
 / (µmol/mol)/ (µmol/mol)
NPL2.233.01
NIST-0.204.70
NMi-0.603.00
BNM-LNE0.101.41
KRISS-0.202.20
NRLM*2.105.01
NRCCRM46.2010.47
VNIIM5.907.95
OMH3.804.02

*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
EUROMET.QM-K1.c
Metrology area, Sub-field Chemistry and Biology, Gases
Description Exhaust emission gases: Nitrogen monoxide in Nitrogen
Time of measurements 2002 - 2003
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 EURAMET (European Association of National Metrology Institutes)
RMO Internal Identifier EUROMET Project No 638
Comments

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

EUROMET.QM-K1.c results published on 22 March 2005

Nitrogen monoxide (NO) in Nitrogen (N2)

Pilot institute VSL
VSL
Netherlands
Contact person Rob WESSEL

+31 (0) 15 269 1677
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
BNM-LNE

Bureau National de Métrologie - Laboratoire National d'Essais, France, EURAMET

CEM

Centro Español de Metrologia, Spain, EURAMET

CHMI

Czech Hydrometeorological Institute, Czechia, EURAMET

GUM

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

IPQ

Instituto Portugues da Qualidade, Portugal, EURAMET

METAS

Federal Institute of Metrology, Switzerland, EURAMET

MIKES-FMI

Finnish Meteorological Institute, Finland, EURAMET

NMi-VSL

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

NPL

National Physical Laboratory, United Kingdom, EURAMET

VNIIM

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

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.

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.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 06Gravimetric value of the transfer cylinder prepared by KRISS: 97.94 µmol/mol, with a standard uncertainty of 0.1 µmol/mol.

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).