CCQM-K4, EUROMET.QM-K4, APMP.QM-K4, APMP.QM-K4.1,
and EURAMET.QM-K4.1
MEASURAND : Amount-of-substance fraction of ethanol in air
NOMINAL VALUE : 120 µmol/mol
Degrees of equivalence D_{i} = (x_{i} - x_{i}_{grav}) and expanded uncertainty U_{i} (k = 2) expressed in µmol/mol
Red diamonds : participants in CCQM-K4 (1999)
Green triangles : participants in EUROMET.QM-K4 (2000 - 2001)
Blue circles : participants in APMP.QM-K4 (2000)
Orange squares : participants in APMP.QM-K4.1 (2005 - 2006)
Pink crosses : participants in EURAMET.QM-K4.1 (2009)
CCQM-K4, EUROMET.QM-K4, APMP.QM-K4, APMP.QM-K4.1,
and EURAMET.QM-K4.1
MEASURAND : Amount-of-substance fraction of ethanol in air
NOMINAL VALUE : 120 µmol/mol
Degrees of equivalence D_{i} = (x_{i} - x_{i}_{grav}) and expanded uncertainty U_{i} (k = 2) expressed in µmol/mol
Lab i | D_{i} | U_{i} |
/(µmol/mol) | /(µmol/mol) | |
BNM-LNE | 0.81 | 2.70 |
NPL | 0.01 | 1.00 |
VNIIM | 4.03 | 0.71 |
NIST | 1.02 | 1.20 |
NMi-VSL | -0.04 | 1.20 |
NRCCRM | -8.68 | 2.00 |
NMIJ | 0.28 | 0.47 |
OMH | -1.09 | 0.45 |
BNM-LNE | -0.94 | 1.20 |
NPL | 0.09 | 0.51 |
VNIIM | 0.08 | 1.20 |
CSIR-NML | 0.22 | 1.56 |
IPQ | 0.03 | 1.09 |
SMU | 0.20 | 0.61 |
CMS/ITRI | 0.12 | 3.54 |
KRISS | -1.30 | 0.82 |
NMIJ | -0.14 | 0.48 |
CSIR-NML | 0.59 | 0.81 |
CERI | -0.01 | 0.41 |
KRISS | 0.05 | 0.47 |
NIM | 3.22 | 2.33 |
In red : participants in CCQM-K4 (1999)
In green : participants in EUROMET.QM-K4 (2000 - 2001)
In blue : participants in APMP.QM-K4 (2000)
In orange : participants in APMP.QM-K4.1 (2005 - 2006)
In pink : participants in EURAMET.QM-K4.1 (2009)
The pair-wise degrees of equivalence between participants in CCQM-K4 or EUROMET.QM-K4 and participants in APMP.QM-K4 and APMP.QM-K4.1 are not explicitely computed. No pair-wise degrees of equivalence involving EURAMET.QM-K4.1 participants have been computed.
Results are presented under A4 printable format in Summary results (PDF file).
Metrology area, Sub-field | Chemistry and Biology, Gases |
Description | Ethanol in air |
Time of measurements | 2000 - 2001 |
Status | Approved for equivalence |
Final Reports of the comparisons | |
Measurand | Amount-of-substance fraction: 120 µmol/mol |
Transfer device | Calibrated gas cylinders measured by gravimetry |
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 580 |
Comments | Results published on 11 October 2002 EUROMET.QM-K4, APMP.QM-K4, APMP.QM-K4.1, and EURAMET.QM-K4.1 results are linked to those of CCQM-K4 |
Pilot institute |
NPL
National Physical Laboratory United Kingdom |
Contact person | M. Milton +44 (0) 20 8943 6826 |
Pilot laboratory | |
---|---|
NPL |
National Physical Laboratory, United Kingdom, EURAMET |
BAM |
Bundesanstalt für Materialforschung und -prüfung, Germany, EURAMET |
BNM-LNE |
Bureau National de Métrologie - Laboratoire National d'Essais, France, EURAMET |
CSIR-NML |
Council for Scientific and Industrial Research, National Metrology Laboratory (became NMISA in 2007), South Africa, AFRIMETS |
GUM |
Glowny Urzad Miar, Central Office of Measures, Poland, EURAMET |
IPQ |
Instituto Portugues da Qualidade, Portugal, EURAMET |
SMU |
Slovensky Metrologicky Ustav, Slovakia, 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-K4, EUROMET.QM-K4, APMP.QM-K4, APMP.QM-K4.1,
and EURAMET.QM-K4.1
MEASURAND : Amount-of-substance fraction of ethanol in air
NOMINAL VALUE : 120 µmol/mol
Key comparison reference value: there is no single key comparison reference value for CCQM-K4, the value x_{igrav} is taken as the reference value for laboratory i participant in CCQM-K4. |
The degree of equivalence of laboratory i participant in CCQM-K4 with respect to the reference value is given by a pair of terms: D_{i} = (x_{i} - x_{igrav}) and U_{i}, its expanded uncertainty (k = 2), both expressed in µmol/mol, U_{i} = 2(u_{i}^{2} + u_{igrav}^{2})^{1/2}. |
The degree of equivalence between two laboratories i and j participant in CCQM-K4 is given by a pair of terms: D_{ij} =(D_{i} - D_{j}) and U_{ij}, its expanded uncertainty (k = 2), both expressed in µmol/mol, U_{ij} = (U_{i}^{2} + U_{j}^{2})^{1/2}. |
The gravimetric value x_{igrav-EUR} is taken as the reference value for laboratory i participant in EUROMET.QM-K4. |
The degree of equivalence of laboratory i participant in EUROMET.QM-K4 with respect to the reference value is given by a pair of terms: D_{i-EUR} = (x_{i-EUR} - x_{igrav-EUR}) and U_{i-EUR}, its expanded uncertainty (k = 2), both expressed in µmol/mol, U_{i-EUR} = 2(u_{i-EUR}^{2} + u_{igrav-EUR}^{2})^{1/2}. |
The gravimetric value x_{igrav-APMP} is taken as the reference value for laboratory i participant in APMP.QM-K4. |
The degree of equivalence of laboratory i participant in APMP.QM-K4 with respect to the reference value is given by a pair of terms: |
The gravimetric value x_{igrav-APMP1} is taken as the reference value for laboratory i participant in APMP.QM-K4.1. |
The degree of equivalence of laboratory i participant in APMP.QM-K4.1 with respect to the reference value is given by a pair of terms: |
The gravimetric value x_{igrav-EUR1} is taken as the reference value for laboratory i participant in EURAMET.QM-K4.1. |
The degree of equivalence of laboratory i participant in EURAMET.QM-K4.1 with respect to the reference value is given by a pair of terms: D_{i-EUR1} = (x_{i-EUR1} - x_{igrav-EUR1}) and U_{i-EUR1}, its expanded uncertainty (k = 2), both expressed in µmol/mol. U_{i-EUR1} is computed according to equation 8 of the EURAMET.QM-K4.1 Final Report. |
The range of gravimetric values of the standards used in both comparisons is very small, so both comparisons are referred to the same nominal amount-of-substance fraction of 120 µmol/mol. |
The link between EUROMET.QM-K4 and CCQM-K4 is given by the gravimetric values delivered by NPL for both comparisons.
Since the results from both BNM-LNE and NPL are comparable with the gravimetric values within their claimed uncertainty in both comparisons, they provide validation that the gravimetric values act as valid reference values. It follows that: |
The degrees of equivalence with respect to the reference value obtained in EUROMET.QM-K4 are transferred to CCQM-K4 without correction: D_{i} = D_{i-EUR} and U_{i} = U_{i-EUR}. |
The range of gravimetric values of the standards used in both comparisons is very small, so both comparisons are referred to the same nominal amount-of-substance fraction of 120 µmol/mol. |
The link between APMP.QM-K4 and CCQM-K4 is given by the gravimetric values delivered by NMIJ for APMP.QM-K4 and by NPL for CCQM-K4.
Since the results from NMIJ are comparable with the gravimetric values within their claimed uncertainty in both comparisons, they provide validation that the gravimetric values act as valid reference values. It follows that: |
The degrees of equivalence with respect to the reference values obtained in APMP.QM-K4 are transferred to CCQM-K4 without correction: D_{i} = D_{i-APMP} and U_{i} = U_{i-APMP}. |
Discussion on the link is given on page 3 of the APMP.QM-K4.1 Final Report. |
CERI, which participated in CCQM-K4 in the name of NMIJ, acts as the linking laboratory between key comparisons APMP.QM-K4.1 and CCQM-K4. |
The degrees of equivalence with respect to the reference values obtained in APMP.QM-K4.1 are transferred to CCQM-K4 without correction: D_{i} = D_{i-APMP1} and U_{i} = U_{i-APMP1}. |
The degree of equivalence between two laboratories i and j, one and the other participant in any one of the four comparisons CCQM-K4, EUROMET.QM-K4, APMP.QM-K4, and APMP.QM-K4.1 is given by a pair of terms: D_{ij} =(D_{i} - D_{j}) and U_{ij}, its expanded uncertainty (k = 2), U_{ij} = (U_{i}^{2} + U_{j}^{2})^{1/2}, both expressed in µmol/mol. |
The range of gravimetric values of the standards used in both comparisons is very small, so both comparisons are referred to the same nominal amount-of-substance fraction of 120 µmol/mol. |
The link between EURAMET.QM-K4.1 and CCQM-K4 is given by the gravimetric values delivered by VSL for EURAMET.QM-K4.1 and by NPL for CCQM-K4.
Since the results from both NPL and VSL are comparable with the gravimetric values within their claimed uncertainties in both comparisons, they provide validation that the gravimetric values act as valid reference values. It follows that: |
The degrees of equivalence with respect to the reference values obtained in EURAMET.QM-K4.1 are transferred to CCQM-K4 without correction: D_{i} = D_{i-EUR1} and U_{i} = U_{i-EUR1}. |
These statements make it possible to extend the CCQM-K4 matrix of equivalence to the full matrix of equivalence involving all participants in CCQM-K4, EUROMET.QM-K4, APMP.QM-K4, APMP.QM-K4.1, and EURAMET.QM-K4.1. |
CCQM-K4, EUROMET.QM-K4, APMP.QM-K4, APMP.QM-K4.1,
and EURAMET.QM-K4.1
MEASURAND : Amount-of-substance fraction of ethanol in air
NOMINAL VALUE: 120 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 ethanol 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)u_{i}
/ (µmol/mol)x_{i}_{grav}
/ (µmol/mol)u_{i}_{grav}
/ (µmol/mol)Date of measure
BNM-LNE
121.40
1.35
120.59
0.05
Aug 99
NPL
120.50
0.50
120.49
0.05
Oct 99
VNIIM
124.70
0.35
120.67
0.05
Jun 99
NIST
121.50
0.60
120.48
0.05
Mar 99
NMi-VSL
120.80
0.60
120.84
0.05
May 99
NRCCRM
112.0
1.0
120.68
0.05
Jul 99
NMIJ
121.04
0.23
120.76
0.05
Apr 99
OMH
119.30
0.22
120.39
0.05
May 99
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 ethanol amount-of-substance fraction in the cylinder received by laboratory i
u_{igrav-EUR }: combined standard uncertainty of x_{i}_{grav-EUR}
Lab i | x_{i}_{-EUR} / (µmol/mol) |
u_{i}_{-EUR} / (µmol/mol) |
x _{i}_{grav-EUR} / (µmol/mol) |
u_{i}_{grav-EUR} / (µmol/mol) |
Date of measure |
BNM-LNE | 119.10 | 0.60 | 120.04 | 0.05 | Dec 00 |
NPL | 119.08 | 0.25 | 118.99 | 0.05 | Nov 00 |
VNIIM | 118.60 | 0.60 | 118.52 | 0.05 | Dec 00 |
CSIR-NML | 119.20 | 0.78 | 118.99 | 0.05 | Dec 00 |
IPQ | 119.65 | 0.55 | 119.62 | 0.05 | Nov 00 |
SMU | 118.88 | 0.30 | 118.68 | 0.05 | Apr 01 |
CSIR-NML originally submitted an expanded uncertainty (k = 2) of 3.2 µmol/mol. |
However, an error in the calculation of this uncertainty was identified some time after the report had been submitted. Subsequently, CSIR-NML submitted an amended report containing a corrected value of 1.56 µmol/mol. This change in the value of the uncertainty was approved in the 8th CCQM meeting held on 18 and 19 April 2002.
x_{i}_{-APMP }: result of measurement carried out by laboratory i
u_{i}_{-APMP }: combined standard uncertainty of x_{i}_{-APMP}
x_{i}_{grav-APMP }: gravimetric value of the ethanol amount-of-substance fraction in the cylinder received by laboratory i
u_{igrav-APMP }: combined standard uncertainty of x_{i}_{grav-APMP}
Lab i | x_{i}_{-APMP} / (µmol/mol) |
u_{i}_{-APMP}/ (µmol/mol) |
x _{i}_{grav-APMP} / (µmol/mol) |
u_{i}_{grav-APMP} / (µmol/mol) |
Date of measure |
CMS/ITRI | 121.27 | 1.76 | 121.15 | 0.184 | Nov, Dec 00 |
KRISS |
120.27 |
0.37 | 121.57 | 0.185 | Jul, Aug, Nov 00 |
NMIJ | 119.31 | 0.16 | 119.45 | 0.182 | Jun 00 |
CSIR-NML | 122.31 | 0.36 | 121.72 | 0.185 | Dec 00 |
CSIR-NML originally submitted an expanded uncertainty (k = 2) of 4.1 µmol/mol. |
However, an error in the calculation of this uncertainty was identified some time after the report had been submitted. Subsequently, CSIR-NML submitted an amended report containing a corrected value of 0.72 µmol/mol. This change in the value of the uncertainty was approved in the CCQM Gas Analysis Working Group meeting held in October 2003.
x_{i}_{-APMP1 }: result of measurement carried out by laboratory i
u_{i}_{-APMP1 }: combined standard uncertainty of x_{i}_{-APMP1}
x_{i}_{grav-APMP1 }: gravimetric value of the ethanol amount-of-substance fraction in the cylinder received by laboratory i
u_{igrav-APMP1 }: combined standard uncertainty of x_{i}_{grav-APMP1}
Lab i | x_{i}_{-APMP1} / (µmol/mol) |
u_{i}_{-APMP1}/ (µmol/mol) |
x _{i}_{grav-APMP1} / (µmol/mol) |
u_{i}_{grav-APMP1} / (µmol/mol) |
Date of measure |
CERI | 110.20 | 0.187 | 110.21 | 0.08 | Nov 05 |
KRISS |
105.37 |
0.223 | 105.32 | 0.08 | Apr 06 |
NIM | 116.4 | 1.164 | 113.18 | 0.08 | Jan, Fev 06 |
x_{i}_{-EUR1 }: result of measurement carried out by laboratory i
u_{i}_{-EUR1 }: combined standard uncertainty of x_{i}_{-EUR1}
x_{i}_{grav-EUR1 }: gravimetric value of the ethanol amount-of-substance fraction in the cylinder received by laboratory i
u_{igrav-EUR1 }: combined standard uncertainty of x_{i}_{grav-EUR1}
Lab i | x_{i}_{-EUR1} / (µmol/mol) |
u_{i}_{-EUR1} / (µmol/mol) |
x _{i}_{grav-EUR1} / (µmol/mol) |
u_{i}_{grav-EUR1} / (µmol/mol) |
Date of measure |
CEM | 120.0 | 1.9 | 120.66 | 0.32 | Nov 09 |
INMETRO | 121.4 | 0.8 | 120.25 | 0.32 | Sep 09 |
NMISA | 120.79 | 0.49 | 120.45 | 0.32 | Dec 09 |
NPL |
120.6 |
0.2 |
120.79 |
0.32 |
Sep 09 |
VNIIM | 119.04 | 0.25 | 120.36 | 0.32 | Nov 09 |
VSL | 120.65 | 0.42 | 120.66 | 0.32 | Aug 09 |