MEASURAND Carbon isotope delta measurement of Vanillin - δVPDB (13C) Vanillin
Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in ‰.
MEASURAND Carbon isotope delta measurement of Vanillin - δVPDB (13C) Vanillin
Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in ‰.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
‰ |
‰ |
‰ |
||
| INMETRO | -0.127 | 0.178 | ||
| MIRS/IJS/F-2,O-2 | -0.037 | 0.180 | ||
| NRC | -0.027 | 0.146 | ||
| NMIA | 0.000 | 0.156 | ||
| UME | 0.013 | 0.170 | ||
| NIM | 0.021 | 0.166 | ||
| VNIIM | 0.023 | 0.154 | ||
| LGC | 0.113 | 0.166 |
| Metrology area, Sub-field | Chemistry and Biology, Isotope ratios |
| Description | Carbon Isotope Delta Measurements of Vanillin |
| Time of measurements | 2019 - 2020 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| Measurand | carbon isotope delta |
| Comparison type | Key Comparison |
| Consultative Committee | CCQM (Consultative Committee for Amount of Substance) |
| Conducted by | CCQM (Consultative Committee for Amount of Substance) |
| Pilot institute |
NRC
National Research Council Canada |
| Contact person | Michelle Chartrand |
| Additional |
| Pilot laboratory | |
|---|---|
| NRC |
National Research Council, Canada, SIM |
| INMETRO |
Instituto Nacional de Metrologia, Qualidade e Tecnologia, Brazil, SIM |
| LGC |
Laboratory of the Government Chemist, United Kingdom, EURAMET |
| MIRS/IJS/F-2,O-2 |
MIRS/Jozef Stefan Institute/Low and Medium Energy Physics F2, Environmental Sciences O2, Slovenia, EURAMET |
| NIM |
National Institute of Metrology, China, APMP |
| NMIA |
National Measurement Institute, Australia, Australia, APMP |
| UME |
TÜBITAK Ulusal Metroloji Enstitüsü, Türkiye, EURAMET |
| VNIIM |
D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET |
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MEASURAND Carbon isotope delta measurement of Vanillin - δVPDB (13C) Vanillin
The key comparison reference value xR and its associated standard uncertainty uR are computed from the reported values of the participants using the Bayesian Random Effect Model (REM) model as described in section 5 of the Final report.
xR = −25.833 ‰ uR = 0.028 ‰
The degree of equivalence of laboratory i relative to the key comparison reference value xR is given by a pair of terms both expressed in ‰:
Di = (xi - xR) and its expanded uncertainty Ui at a 95 % level of confidence.
Further information on the calculation of Ui can be found in section 5.4 of the Final report.
MEASURAND Carbon isotope delta measurement of Vanillin - δVPDB (13C) Vanillin
xi δVPDB (13C) measurement value submitted by laboratory i, Labi
ui combined standard uncertainty of xi
| Labi | xi | ui |
| ‰ | ‰ | |
| INMETRO | −25.96 | 0.056 |
| MIRS/IJS/F-2,O-2 | −25.87 | 0.06 |
| NRC | −25.86 | 0.03 |
| NMIA | −25.833 | 0.041 |
| UME | −25.82 | 0.08 |
| NIM | −25.812 | 0.048 |
| VNIIM | −25.81 | 0.04 |
| LGC | −25.72 | 0.05 |
