MEASURAND : Amount-of-substance fraction of Carbon monoxide in Nitrogen
NOMINAL VALUE : 5 µmol/mol
Degrees of equivalence, offset Di and expanded uncertainty (k = 2) Ui, expressed in µmol/mol
MEASURAND : Amount-of-substance fraction of Carbon monoxide in Nitrogen
NOMINAL VALUE : 5 µmol/mol
Degrees of equivalence, offset Di and expanded uncertainty (k = 2) Ui, expressed in µmol/mol
Results are presented under A4 printable format in Summary Results (.PDF file).
| Metrology area, Sub-field | Chemistry and Biology, Gases |
| Description | Carbon monoxide (CO) in Nitrogen (N2) |
| Time of measurements | 2008 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| Measurand | Amount-of-substance fraction: 5 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 | CCQM (Consultative Committee for Amount of Substance) |
| Comments | Results published on 22 January 2010 Carbon monoxide in Nitrogen |
| Pilot institute |
NMISA
National Metrology Institute of South Africa South Africa |
| Contact person | Angelique BOTHA +27 12 841 3800 |
| Pilot laboratory | |
|---|---|
| NMISA |
National Metrology Institute of South Africa, South Africa, AFRIMETS |
| BAM |
Bundesanstalt für Materialforschung und -prüfung, Germany, EURAMET |
| CEM |
Centro Español de Metrologia, Spain, EURAMET |
| CENAM |
Centro Nacional de Metrologia, Mexico, SIM |
| CERI |
Chemicals Evaluation and Research Institute, Japan, APMP |
| EAA |
Umweltbundesamt GmbH, Environmental Agency of Austria, Austria, EURAMET |
| GUM |
Glowny Urzad Miar, Central Office of Measures, Poland, EURAMET |
| INMETRO |
Instituto Nacional de Metrologia, Qualidade e Tecnologia, Brazil, SIM |
| IPQ |
Instituto Portugues da Qualidade, Portugal, EURAMET |
| JRC |
Joint Research Centre, European Union, EURAMET |
| KRISS |
Korea Research Institute of Standards and Science, Korea, Republic of, APMP |
| LNE |
Laboratoire national de métrologie et d'essais, France, EURAMET |
| METAS |
Federal Institute of Metrology, Switzerland, EURAMET |
| MIKES-FMI |
Finnish Meteorological Institute, Finland, EURAMET |
| NIM |
National Institute of Metrology, China, APMP |
| NIMT |
National Institute of Metrology (Thailand), Thailand, APMP |
| NIST |
National Institute of Standards and Technology, United States, SIM |
| NMIA |
National Measurement Institute, Australia, Australia, APMP |
| NMIJ AIST |
National Metrology Institute of Japan, Japan, APMP |
| NPL |
National Physical Laboratory, United Kingdom, EURAMET |
| NPLI |
CSIR National Physical Laboratory of India, India, APMP |
| SMU |
Slovensky Metrologicky Ustav, Slovakia, EURAMET |
| UBA |
Umweltbundesamt, Federal Environment Agency, Germany, EURAMET |
| VNIIM |
D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET |
| VSL |
VSL, Netherlands, EURAMET |
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MEASURAND : Amount-of-substance fraction of Carbon monoxide in Nitrogen
NOMINAL VALUE : 5 µmol/mol
| Key comparison reference value: there is no single reference value for this comparison, the value obtained from preparation, xi grav, is taken as the reference value for laboratory i. |
| The degree of equivalence of each laboratory i with respect to the reference value is given by a pair of terms: Di = (xi - xi grav) and Ui, its expanded uncertainty at a 95% level of confidence, both expressed in µmol/mol, Ui = 2[ui2 + ui ref2]1/2, using a coverage factor k = 2. |
| No pair-wise degrees of equivalence are computed for this key comparison. |
MEASURAND : Amount-of-substance fraction of Carbon monoxide in Nitrogen
NOMINAL VALUE : 5 µmol/mol
xi : result of measurement carried out by laboratory i
ui : combined standard uncertainty of xi
xi grav : amount-of-substance fraction in the cylinder sent to laboratory i from gravimetric preparation, taken as the reference value for laboratory i
ui ref : standard uncertainty of the reference value, ui ref = (ui grav2 + ui ver2)1/2 (with ui grav is the standard uncertainty from preparation and ui ver the standard uncertainty from verification)
