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 | 2024 |
Status | Measurements completed |
Measurand | Amount content of base expressed as sodium carbonate |
Transfer device | Sample of sodium carbonate |
Comparison type | Key Comparison |
Consultative Committee | CCQM (Consultative Committee for Amount of Substance) |
Conducted by | CCQM (Consultative Committee for Amount of Substance) |
Pilot institute |
SMU
Slovensky Metrologicky Ustav Slovakia |
Contact person | Michal Mariassy +421 2 602 94 522 |
Additional |
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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 |