CCQM-K169
MEASURAND Amount content of reductants expressed as sodium oxalate
Degrees of equivalence represented by Di = (xi - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mol/kg.
CCQM-K169
MEASURAND Amount content of reductants expressed as sodium oxalate
Degrees of equivalence represented by Di = (xi - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mol/kg.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
mol·kg-1 |
mol·kg-1 |
mol·kg-1 |
||
| INMETRO | -0.00746 | 0.00364 | ||
| NIM | -0.00126 | 0.00364 | ||
| VNIIM | 0.00000 | 0.00359 | ||
| CENAM | 0.00209 | 0.00377 | ||
| BFKH | 0.00578 | 0.00599 |
| Metrology area, Sub-field | Chemistry and Biology, Electrochemistry |
| Description | Assay of sodium oxalate |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| Measurand | Amount content of reductants expressed as sodium oxalate |
| 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 09 November 2026 |
| Pilot institute |
VNIIM
D.I. Mendeleyev Institute for Metrology, Rosstandart Russian Federation |
| Contact person | Alena Sobina +73432280012 |
| Additional |
| Pilot laboratory | |
|---|---|
| VNIIM |
D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET |
| BFKH |
Government Office of the Capital City Budapest, Hungary, EURAMET |
| CENAM |
Centro Nacional de Metrologia, Mexico, SIM |
| INMETRO |
Instituto Nacional de Metrologia, Qualidade e Tecnologia, Brazil, SIM |
| NIM |
National Institute of Metrology, China, APMP |
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CCQM-K169
MEASURAND Amount content of reductants expressed as sodium oxalate
The key comparison reference value xR and its associated standard uncertainty uR are computed from the median of the reported results, as described in Section 9 of the CCQM-K169 Final report.
xR = 7.46093 mol/kg uR = 0.00174 mol/kg
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 mol/kg:
Di = (xi - xR) and its expanded uncertainty Ui at a 95 % level of confidence computed as described in Section 10 of the CCQM-K169 Final report.
CCQM-K169
MEASURAND Amount content of reductants expressed as sodium oxalate
xi measurement value reported by laboratory i, Labi
ui combined standard uncertainty of xi
| Labi | xi | ui | |
| mol/kg | mol/kg | ||
| INMETRO | 7.45347 | 0.000686 | |
| NIM | 7.45967 | 0.000695 | |
| VNIIM | 7.46093 | 0.000583 | |
| CENAM | 7.46302 | 0.000935 | |
| BFKH | 7.46671 | 0.003149 |
