CCQM-K18.2016 and APMP.QM-K18.2016
MEASURAND pH
NOMINAL VALUE 10
PARAMETER at 25 °C
Degrees of equivalence represented by Di = (xi - xR) and its expanded uncertainty Ui at a 95 % level of confidence (dimensionless measurand).
CCQM-K18.2016 and APMP.QM-K18.2016
MEASURAND pH
NOMINAL VALUE 10
PARAMETER at 25 °C
Degrees of equivalence represented by Di = (xi - xR) and its expanded uncertainty Ui at a 95 % level of confidence (dimensionless measurand).
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
(dimensionless) |
(dimensionless) |
(dimensionless) |
||
| BFKH | 0.005 | 0.011 | ||
| BIM | 0.008 | 0.011 | ||
| CENAM | -0.014 | 0.021 | ||
| CMI | 0.006 | 0.011 | ||
| DFM | -0.001 | 0.011 | ||
| GUM | -0.006 | 0.011 | ||
| INMETRO | -0.004 | 0.011 | ||
| LNE | -0.002 | 0.011 | ||
| NIMT | -0.006 | 0.012 | ||
| NIST | 0.002 | 0.011 | ||
| NMIJ | 0.002 | 0.011 | ||
| PTB | 0.003 | 0.010 | ||
| SMU | -0.001 | 0.011 | ||
| UME | 0.005 | 0.011 | ||
| UMTS | -0.018 | 0.011 | ||
| VNIIFTRI | 0.009 | 0.011 | ||
| INM | 0.027 | 0.013 | ||
| INACAL | 0.005 | 0.012 | ||
| LATU | 0.003 | 0.012 | ||
| CENAM | -0.004 | 0.013 | ||
| GLHK | -0.001 | 0.016 | ||
| IBMETRO | -0.010 | 0.011 | ||
| INMETRO | -0.001 | 0.006 | ||
| MUSSD | -0.007 | 0.016 | ||
| NIM | -0.001 | 0.006 | ||
| NIMT | -0.011 | 0.009 | ||
| UMTS | -0.011 | 0.007 | ||
| VNIIFTRI | 0.002 | 0.007 |
| Metrology area, Sub-field | Chemistry and Biology, Electrochemistry |
| Description | pH measurement of carbonate buffer |
| Time of measurements | 2020 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| Measurand | Acidity functions or pH, pH ~10.0 (carbonate) |
| Parameters | Harned cell measurements, differential potentiometric cell measurements, or glass electrode measurements at 25 °C. |
| Comparison type | Key Comparison |
| Consultative Committee | CCQM (Consultative Committee for Amount of Substance) |
| Conducted by | APMP (Asia Pacific Metrology Programme) |
| Pilot institute |
NMIJ AIST
National Metrology Institute of Japan Japan |
| Contact person | Toshiaki Asakai +81 50 3521 3250 |
| Pilot laboratory | |
|---|---|
| NMIJ AIST |
National Metrology Institute of Japan, Japan, APMP |
| CENAM |
Centro Nacional de Metrologia, Mexico, SIM |
| GL |
Government Laboratory, Hong Kong, China, APMP |
| IBMETRO |
Instituto Boliviano de Metrología, Bolivia, SIM |
| INM (CO) |
Instituto Nacional de Metrología de Colombia, Colombia, SIM |
| INMETRO |
Instituto Nacional de Metrologia, Qualidade e Tecnologia, Brazil, SIM |
| MUSSD |
Department of Measurement Units, Standards and Services, Sri Lanka, APMP |
| NIM |
National Institute of Metrology, China, APMP |
| NIMT |
National Institute of Metrology (Thailand), Thailand, APMP |
| PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
| SE "Ukrmetrteststandard" |
State Enterprise "Ukrmetrteststandard", Ukraine, EURAMET |
| VNIIFTRI |
Institute of Physical Technical and Radiotechnical Measurements, Rosstandart, Russian Federation, COOMET |
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CCQM-K18.2016 and APMP.QM-K18.2016
MEASURAND pH
NOMINAL VALUE 10
PARAMETER at 25 °C
The key comparison reference value xR and its associated standard uncertainty uR are computed from a DerSimonian-Laird estimation of the reported results (see p 9 of the CCQM-K18.2016 Final Report):
xR = 10.1157 uR = 0.0017
The degree of equivalence of laboratory i relative to the key comparison reference value xR is given by a pair of terms (dimensionless):
Di = (xi - xR) and its expanded uncertainty Ui at a 95 % level of confidence where Ui = 2 ui.
Linking APMP.QM-K18.2016 to CCQM-K18.2016
The results of APMP.QM-K18.2016 were linked to CCQM-K18.2016 via NMIJ AIST and PTB who participated in both comparisons.
CCQM-K18.2016 and APMP.QM-K18.2016
MEASURAND pH
NOMINAL VALUE 10
PARAMETER at 25 °C
CCQM-K18.2016
xi reported pH by laboratory i, Labi
u (xi) combined standard uncertainty of xi
APMP.QM-K18.2016
xi reported pH by laboratory i, Labi
u (xi) combined standard uncertainty of xi
