MEASURAND Amount fraction ammonia in nitrogen
Degrees of equivalence represented by Di = (xI - xRi) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in µmol/mol.
MEASURAND Amount fraction ammonia in nitrogen
Degrees of equivalence represented by Di = (xI - xRi) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in µmol/mol.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
µmol/mol |
µmol/mol |
µmol/mol |
||
| NIST | -0.103 | 0.204 | ||
| CERI | 0.046 | 0.185 | ||
| NPL | 0.018 | 0.402 | ||
| KRISS | 0.056 | 0.146 | ||
| NIM | 0.238 | 0.223 | ||
| VSL | -0.030 | 0.127 | ||
| METAS | -0.681 | 0.180 | ||
| VNIIM | 0.586 | 0.251 |
| Metrology area, Sub-field | Chemistry and Biology, Gases |
| Description | NH3 in Nitrogen |
| Time of measurements | 2017 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| Measurand | Amount fraction Ammonia |
| Transfer device | Dedicated samples |
| Comparison type | Key Comparison |
| Consultative Committee | CCQM (Consultative Committee for Amount of Substance) |
| Conducted by | CCQM (Consultative Committee for Amount of Substance) |
| Pilot institute |
VSL
VSL Netherlands |
| Contact person | A. van der Veen +31 15 2691500 |
| Pilot laboratory | |
|---|---|
| VSL |
VSL, Netherlands, EURAMET |
| CERI |
Chemicals Evaluation and Research Institute, Japan, APMP |
| KRISS |
Korea Research Institute of Standards and Science, Korea, Republic of, APMP |
| METAS |
Federal Institute of Metrology, Switzerland, EURAMET |
| NIM |
National Institute of Metrology, China, APMP |
| NIST |
National Institute of Standards and Technology, United States, SIM |
| NPL |
National Physical Laboratory, United Kingdom, EURAMET |
| VNIIM |
D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET |
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MEASURAND Amount fraction ammonia in nitrogen
The key comparison reference value xRi and its associated standard uncertainty uRi are computed for each cylinder as explained in the CCQM-K117 Final Report.
| Labi | xR,i | u Ri |
| µmol/mol | µmol/mol | |
| NIST | 13.743 | 0.056 |
| CERI | 13.814 | 0.056 |
| NPL | 13.782 | 0.058 |
| KRISS | 13.514 | 0.053 |
| NIM | 13.612 | 0.057 |
| VSL | 14.310 | 0.052 |
| METAS | 13.621 | 0.065 |
| VNIIM | 13.824 | 0.056 |
The degree of equivalence of laboratory i relative to the key comparison reference value xRi is given by a pair of terms, both expressed in mol/mol:
Di = (xi - xRi) and its expanded uncertainty Ui at a 95 % level of confidence where Ui = 2 ui.
MEASURAND Amount fraction ammonia in nitrogen
xi measured mass fraction reported by laboratory i, Labi
ui combined standard uncertainty of xi
| Labi | xi | ui |
| µmol/mol | µmol/mol | |
| NIST | 13.640 | 0.100 |
| CERI | 13.860 | 0.090 |
| NPL | 13.800 | 0.200 |
| KRISS | 13.570 | 0.075 |
| NIM | 13.850 | 0.100 |
| VSL | 14.280 | 0.070 |
| METAS | 12.940 | 0.065 |
| VNIIM | 14.410 | 0.115 |
