CCQM-K34.2016 and CCQM-K34.2016.1
MEASURAND Amount content of weak acid in potassium hydrogen phthalate
NOMINAL VALUE 4.9 mol/kg
Degrees of equivalence represented by Di and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mol/kg.
CLOSER VIEW
CCQM-K34.2016 and CCQM-K34.2016.1
MEASURAND Amount content of weak acid in potassium hydrogen phthalate
NOMINAL VALUE 4.9 mol/kg
Degrees of equivalence represented by Di and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mol/kg.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
mol/kg |
mol/kg |
mol/kg |
||
| NIST | -0.00127 | 0.00029 | ||
| VNIIFTRI | -0.00069 | 0.00032 | ||
| NMIJ | -0.00051 | 0.00057 | ||
| INTI | -0.00023 | 0.00295 | ||
| GUM | -0.00020 | 0.00043 | ||
| KRISS | -0.00002 | 0.00039 | ||
| INMETRO | 0.00002 | 0.00034 | ||
| NIM | 0.00008 | 0.00035 | ||
| UNIIM | 0.00009 | 0.00055 | ||
| SMU | 0.00010 | 0.00039 | ||
| CENAM | 0.00305 | 0.00071 | ||
| INM | 0.06272 | 0.15640 | ||
| NIST | 0.00037 | 0.00046 | ||
| CENAM | 0.00097 | 0.00044 |
| Metrology area, Sub-field | Chemistry and Biology, Inorganics |
| Description | Determination of amount of acid in a solid weak acid |
| Time of measurements | 2019 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| Measurand | Amount content of acid in solid potassium hydrogen phthalate |
| 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 19 January 2021 |
| Pilot institute |
NIM
National Institute of Metrology China |
| Contact person | MA LIANDI +86 10 642 23 987 |
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CCQM-K34.2016
MEASURAND Amount content of weak acid in potassium hydrogen phthalate
NOMINAL VALUE 4.9 mol/kg
The key comparison reference value, xR, is calculated as the median of the participant results with an associated standard uncertainty, uR.
xR = 4.89615 mol/kg, uR = 0.00025 mol/kg
The degree of equivalence of laboratory i relative to the key comparison reference value is given by a pair of terms, both expressed in mol/kg:
Di = (xi - xR) and its expanded uncertainty Ui (k = 2) where Ui = 2(ui2 + uR2)1/2.
Linking CCQM-K34.2016.1 to CCQM-K34.2016
The SMU and NIM provide the link between the two key comparisons, and the linking process is described in Section 9 of the CCQM-K34.2016.1 Final Report.
MEASURAND Amount content of weak acid in potassium hydrogen phthalate
NOMINAL VALUE 4.9 mol/kg
xi result of measurement reported by laboratory i, Labi
ui combined standard uncertainty of xi
CCQM-K34.2016
| Labi | xi | ui |
| mol/kg | mol/kg | |
| NIST | 4.89487 | 0.00008 |
| VNIIFTRI | 4.89546 | 0.00010 |
| NMIJ | 4.89563 | 0.00026 |
| INTI | 4.89592 | 0.00147 |
| GUM | 4.89594 | 0.00018 |
| KRISS | 4.89612 | 0.00015 |
| INMETRO | 4.89617 | 0.00012 |
| NIM | 4.89623 | 0.00013 |
| UNIIM | 4.89624 | 0.00025 |
| SMU | 4.89625 | 0.00015 |
| CENAM | 4.89920 | 0.00034 |
| INM | 4.95887 | 0.07820 |
CCQM-K34.2016.1
| Labi | xi | ui |
| mol/kg | mol/kg | |
| SMU | 4.895475 | 0.000186 |
| NIM | 4.895524 | 0.000122 |
| NIST | 4.895775 | 0.000192 |
| CENAM | 4.896377 | 0.000184 |
| CENAM additional | 4.897972 | 0.000649 |
