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 D_{i} and expanded uncertainty U_{i} (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 D_{i} and expanded uncertainty U_{i} (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 i | D_{i} | U_{i} |
/ (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).
MEASURAND : Amount-of-substance fraction of Nitrogen monoxide in Nitrogen
NOMINAL VALUE : 1000 µmol/mol
Lab i | D_{i} | U_{i} |
/ (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).
Metrology area, Sub-field | Chemistry and Biology, Gases |
Description | Nitrogen monoxide (NO) in Nitrogen (N_{2}) |
Time of measurements | 1995 - 1996 |
Status | Approved for equivalence |
Final Reports of the comparisons | |
Measurand | Amount-of-substance fraction of NO in N_{2}: 100 µmol/mol and 1000 µmol/mol |
Transfer device | Calibrated gas cylinder measured by gravimetry |
Comparison type | Key Comparison |
Consultative Committee | CCQM (Consultative Committee for Amount of Substance) |
Conducted by | CCQM (Consultative Committee for Amount of Substance) |
Comments | CCQM-K1.c is one of the seven sub-comparisons CCQM-K1.a, .b, .c, .d, .e, .f, and .g of the key comparison CCQM-K1 on gas mixtures EUROMET.QM-K1.c and APMP.QM-K1.c results are linked to those of CCQM-K1.c for 100 µmol/mol CCQM-K1.c results published in May 2000 Nitrogen monoxide (NO) in Nitrogen (N_{2}) |
Pilot institute |
VSL
VSL Netherlands |
Contact person | E. de Leer +31 (0) 15 269 1712 |
BNM-LNE |
Bureau National de Métrologie - Laboratoire National d'Essais, France, EURAMET |
KRISS |
Korea Research Institute of Standards and Science, Korea, Republic of, APMP |
NIST |
National Institute of Standards and Technology, United States, SIM |
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 |
NRCCRM |
National Research Centre for Certified Reference Materials, merged in NIM (National Institute of Metrology) starting 1st January 2006, China, APMP |
OMH |
Országos Mérésügyi Hivatal; Subsequently MKEH, now BKFH, Hungary, EURAMET |
VNIIM |
D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET |
This page proposes print-out on A4 paper (portrait) of the comparison details (best printed out using a black and white printer).
Please, select items to be printed out, then click on "OK" :
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 reference value: there is no single reference value for this comparison, the value x_{i}_{grav} 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: D_{i} = (x_{i} - x_{i}_{grav}) and U_{i}, its expanded uncertainty (k = 2), both expressed in µmol/mol, U_{i} = 2(u_{i}^{2} + u_{i}_{grav}^{2})^{1/2}. |
The degree of equivalence between two laboratories is given by a pair of terms: |
The gravimetric value x_{i}_{grav-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:
D_{i-EUR} = (x_{i-EUR} - x_{i}_{grav-EUR}) and U_{i-EUR}, its expanded uncertainty (k = 2), both expressed in µmol/mol,
U_{i-EUR} = 2(u_{i-EUR}^{2} + u_{i}_{grav-EUR}^{2})^{1/2}.
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: D_{i} = D_{i}_{-EUR} and U_{i} = U_{i}_{-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: |
These statements make it possible to extend the CCQM-K1.c matrix of equivalence to all participants in EUROMET.QM-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 x_{i}_{grav} 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: D_{i} = (x_{i} - x_{i}_{grav}) and U_{i}, its expanded uncertainty (k = 2), both expressed in µmol/mol, U_{i} = 2(u_{i}^{2} + u_{i}_{grav}^{2})^{1/2}. |
The degree of equivalence between two laboratories is given by a pair of terms: D_{ij} = D_{i} - D_{j} = (x_{i} - x_{i}_{grav}) - (x_{j}_{ }- x_{j}_{grav}) and U_{ij}, its expanded uncertainty (k = 2), both expressed in µmol/mol, U_{ij} = 2(u_{i}^{2} + u_{j}^{2} + u_{i}_{grav}^{2} + u_{j}_{grav}^{2})^{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
x_{i} : result of measurement carried out by laboratory i
u_{i} : combined standard uncertainty of x_{i}
x_{i}_{grav} : gravimetric value of the NO amount-of-substance fraction in the cylinder received by laboratory i
u_{i}_{grav} : combined standard uncertainty of x_{i}_{grav}
Lab i | x_{i} / (µmol/mol) |
x_{i}_{grav}
/ (µmol/mol)
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.
x_{i-EUR} : result of measurement carried out by laboratory i
u_{i-EUR} : combined standard uncertainty of x_{i}_{-EUR}
x_{i}_{grav-EUR} : gravimetric value of the NO amount-of-substance fraction in the cylinder received by laboratory i
u_{i}_{grav-EUR} : combined standard uncertainty of x_{igrav-EUR}
Lab i | x_{i}_{-EUR} / (µmol/mol) |
u_{i}_{-EUR} / (µmol/mol) |
x_{igrav-EUR} |
u_{i}_{grav-EUR}/ (µmol/mol) |
94.8
0.75
95.158
0.062
Sep 02
IPQ95.22
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.
x_{i-APMP} : result of measurement carried out by laboratory i
u_{i-APMP} : combined standard uncertainty of x_{i}_{-APMP}
Lab i | x_{i}_{-APMP} / (µmol/mol) |
u_{i}_{-APMP} / (µmol/mol) |