CCQM-K173
MEASURAND Amount content of bases expressed as sodium carbonate (Na2CO3)
NOMINAL VALUE 10 mol/kg
Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence (k = 2), both expressed in mol/kg.
CCQM-K173
MEASURAND Amount content of bases expressed as sodium carbonate (Na2CO3)
NOMINAL VALUE 10 mol/kg
Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence (k = 2), both expressed in mol/kg.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
mol/kg |
mol/kg |
mol/kg |
||
| INMETRO | -0.00681 | 0.02590 | ||
| SE "Ukrmetrteststandard" | -0.00507 | 0.01722 | ||
| NMIJ | -0.00159 | 0.00265 | ||
| SMU | -0.00141 | 0.00242 | ||
| NIM | -0.00119 | 0.00250 | ||
| UNIIM | 0.00119 | 0.00284 | ||
| CENAM | 0.00185 | 0.00257 | ||
| BAM | 0.00189 | 0.00409 | ||
| CMI | 0.00595 | 0.00679 |
| Metrology area, Sub-field | Chemistry and Biology, Electrochemistry |
| Description | Assay of sodium carbonate |
| Time of measurements | 2021 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| References | |
| Measurand | Amount content |
| Transfer device | Solid sodium carbonate samples |
| 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 25 January 2023 |
| Pilot institute |
NIM
National Institute of Metrology China |
| Contact person | Wu Bing 86-010-64524751 |
| Additional |
| Pilot laboratory | |
|---|---|
| NIM |
National Institute of Metrology, China, APMP |
| BAM |
Bundesanstalt für Materialforschung und -prüfung, Germany, EURAMET |
| CENAM |
Centro Nacional de Metrologia, Mexico, SIM |
| CMI |
Czech Metrology Institute, Czechia, EURAMET |
| INMETRO |
Instituto Nacional de Metrologia, Qualidade e Tecnologia, Brazil, SIM |
| INTI |
Instituto Nacional de Tecnologia Industrial, Argentina, SIM |
| NIST |
National Institute of Standards and Technology, United States, SIM |
| NMIJ AIST |
National Metrology Institute of Japan, Japan, APMP |
| SE "Ukrmetrteststandard" |
State Enterprise "Ukrmetrteststandard", Ukraine, EURAMET |
| SMU |
Slovensky Metrologicky Ustav, Slovakia, EURAMET |
| VNIIM |
D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET |
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CCQM-K173
MEASURAND Amount content of bases expressed as sodium carbonate (Na2CO3)
NOMINAL VALUE 10 mol/kg
The key comparison reference value xR and its associated standard uncertainty uR are computed from the median of the results of the participants, excluding CMI, INMETRO and SE "Ukrmetrteststandard" (See further detailed information in section 8.1 of the Final Report)
xR = 9.4320 mol/kg uR = 0.00114 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 where Ui = 2 (ui 2 + uR2)1/2
CCQM-K173
MEASURAND Amount content of bases expressed as sodium carbonate (Na2CO3)
NOMINAL VALUE 10 mol/kg
xi measurement value reported by laboratory i, Labi
ui standard uncertainty of xi
| Labi | xi | ui | |
| mol kg-1 | mol kg-1 | ||
| INMETRO | 9.4252 | 0.0129 | |
| SE "Ukrmetrteststandard" | 9.4269 | 0.0085 | |
| NMIJ | 9.43042 | 0.00068 | |
| SMU | 9.4306 | 0.00041 | |
| NIM | 9.43082 | 0.00051 | |
| VNIIM | 9.4332 | 0.00085 | |
| CENAM | 9.43386 | 0.00060 | |
| BAM | 9.4339 | 0.0017 | |
| CMI | 9.4380 | 0.0032 |
