CCQM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 15 °C
Degrees of equivalence represented by Di = pai0 - xR and its expanded uncertainty Ui at a 95 % level of confidence, both in dimensionless units.
CCQM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 25 °C
Degrees of equivalence represented by Di = pai0 - xR and its expanded uncertainty Ui at a 95 % level of confidence, both in dimensionless units.
CCQM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 37 °C
Degrees of equivalence represented by Di = pai0 - xR and its expanded uncertainty Ui at a 95 % level of confidence, both in dimensionless units.
CCQM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 5 °C
Degrees of equivalence represented by Di = pai0 - xR and its expanded uncertainty Ui at a 95 % level of confidence, both in dimensionless units.
CCQM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 50 °C
Degrees of equivalence represented by Di = pai0 - xR and its expanded uncertainty Ui at a 95 % level of confidence, both in dimensionless units.
CCQM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 15 °C
Degrees of equivalence represented by Di = pai0 - xR and its expanded uncertainty Ui at a 95 % level of confidence, both in dimensionless units.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
(dimensionless) |
(dimensionless) |
(dimensionless) |
||
| BFKH | -0.0016 | 0.0054 | ||
| BIM | 0.0021 | 0.0036 | ||
| CMI | -0.0114 | 0.0026 | ||
| GUM | -0.0030 | 0.0029 | ||
| INMETRO | 0.0023 | 0.0021 | ||
| LATU | 0.0151 | 0.0112 | ||
| NIM | 0.0009 | 0.0034 | ||
| NIMT | 0.0021 | 0.0106 | ||
| NMIJ | -0.0013 | 0.0022 | ||
| PTB | -0.0010 | 0.0015 | ||
| SMU | 0.0024 | 0.0027 | ||
| UkrCSM | 0.0331 | 0.0049 | ||
| VNIIFTRI | 0.0008 | 0.0035 |
CCQM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 25 °C
Degrees of equivalence represented by Di = pai0 - xR and its expanded uncertainty Ui at a 95 % level of confidence, both in dimensionless units.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
(dimensionless) |
(dimensionless) |
(dimensionless) |
||
| BFKH | -0.0080 | 0.0063 | ||
| BIM | 0.0040 | 0.0039 | ||
| CMI | -0.0173 | 0.0028 | ||
| GUM | -0.0025 | 0.0028 | ||
| IBMETRO | 0.0471 | 0.0104 | ||
| INMETRO | 0.0029 | 0.0030 | ||
| INTI | 0.0040 | 0.0798 | ||
| LATU | 0.0146 | 0.0113 | ||
| NIM | 0.0000 | 0.0035 | ||
| NIMT | -0.0080 | 0.0085 | ||
| NMIJ | -0.0010 | 0.0024 | ||
| PTB | 0.0000 | 0.0017 | ||
| SMU | 0.0027 | 0.0033 | ||
| UkrCSM | 0.0279 | 0.0050 | ||
| VNIIFTRI | -0.0001 | 0.0036 |
CCQM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 37 °C
Degrees of equivalence represented by Di = pai0 - xR and its expanded uncertainty Ui at a 95 % level of confidence, both in dimensionless units.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
(dimensionless) |
(dimensionless) |
(dimensionless) |
||
| BFKH | -0.0066 | 0.0039 | ||
| BIM | 0.0035 | 0.0037 | ||
| CMI | -0.0132 | 0.0032 | ||
| GUM | -0.0025 | 0.0028 | ||
| INMETRO | 0.0023 | 0.0028 | ||
| LATU | 0.0176 | 0.0106 | ||
| NIM | -0.0029 | 0.0035 | ||
| NIMT | -0.0054 | 0.0089 | ||
| NMIJ | -0.0004 | 0.0024 | ||
| PTB | 0.0006 | 0.0015 | ||
| SMU | 0.0023 | 0.0037 | ||
| UkrCSM | 0.0227 | 0.0058 | ||
| VNIIFTRI | 0.0004 | 0.0036 |
CCQM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 5 °C
Degrees of equivalence represented by Di = pai0 - xR and its expanded uncertainty Ui at a 95 % level of confidence, both in dimensionless units.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
(dimensionless) |
(dimensionless) |
(dimensionless) |
||
| GUM | -0.0010 | 0.0030 | ||
| PTB | 0.0001 | 0.0008 | ||
| UkrCSM | 0.0408 | 0.0054 | ||
| VNIIFTRI | 0.0007 | 0.0032 |
CCQM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 50 °C
Degrees of equivalence represented by Di = pai0 - xR and its expanded uncertainty Ui at a 95 % level of confidence, both in dimensionless units.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
(dimensionless) |
(dimensionless) |
(dimensionless) |
||
| GUM | -0.0043 | 0.0031 | ||
| PTB | 0.0006 | 0.0018 | ||
| SMU | 0.0015 | 0.0037 | ||
| UkrCSM | 0.0242 | 0.0048 | ||
| VNIIFTRI | 0.0002 | 0.0039 |
| Metrology area, Sub-field | Chemistry and Biology, Electrochemistry |
| Description | pH measurement of borate buffer solutions |
| Time of measurements | 2019 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| Measurand | pH ~9.2 |
| Parameters | Harned cell measurements at 5 °C, 15 °C, 25 °C, 37 °C and 50 °C |
| Comparison type | Key Comparison |
| Consultative Committee | CCQM (Consultative Committee for Amount of Substance) |
| Conducted by | CCQM (Consultative Committee for Amount of Substance) |
| Comments | Determination of the acidity functions at zero chloride molality of an unknown borate buffer |
| Pilot institute |
NMIJ AIST
National Metrology Institute of Japan Japan |
| Contact person | Toshiaki Asakai +81 50 3521 3250 |
| Additional |
| Pilot laboratory | |
|---|---|
| NMIJ AIST |
National Metrology Institute of Japan, Japan, APMP |
| BFKH |
Government Office of the Capital City Budapest, Hungary, EURAMET |
| BIM |
Bulgarian Institute of Metrology, Bulgaria, EURAMET |
| CENAM |
Centro Nacional de Metrologia, Mexico, SIM |
| CMI |
Czech Metrology Institute, Czechia, EURAMET |
| GUM |
Glowny Urzad Miar, Central Office of Measures, Poland, EURAMET |
| IBMETRO |
Instituto Boliviano de Metrología, Bolivia, SIM |
| INMETRO |
Instituto Nacional de Metrologia, Qualidade e Tecnologia, Brazil, SIM |
| INTI |
Instituto Nacional de Tecnologia Industrial, Argentina, SIM |
| IPQ |
Instituto Portugues da Qualidade, Portugal, EURAMET |
| LATU |
Laboratorio Tecnologico del Uruguay, Uruguay, SIM |
| 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 |
| SMU |
Slovensky Metrologicky Ustav, Slovakia, EURAMET |
| VNIIFTRI |
Institute of Physical Technical and Radiotechnical Measurements, Rosstandart, Russian Federation, COOMET |
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CCQM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 15 °C
Degrees of equivalence represented by Di = pai0 - xR and its expanded uncertainty Ui at a 95 % level of confidence (k = 2), both in dimensionless units, where pai0 represents the acidity function at zero chloride molality at 15 °C.
The key comparison reference value xR determined for a temperature at 15 °C and its associated standard uncertainty uR are computed from a weighted mean with dispersion where
xR = 9.31263 uR = 0.00059
CCQM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 25 °C
Degrees of equivalence represented by Di = pai0 - xR and its expanded uncertainty Ui at a 95 % level of confidence (k = 2), both in dimensionless units, where pai0 represents the acidity function at zero chloride molality at 25 °C.
The key comparison reference value xR determined for a temperature at 15 °C and its associated standard uncertainty uR are computed from a weighted mean with dispersion where
xR = 9.22050 uR = 0.00073
CCQM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 37 °C
Degrees of equivalence represented by Di = pai0 - xR and its expanded uncertainty Ui at a 95 % level of confidence (k = 2), both in dimensionless units, where pai0 represents the acidity function at zero chloride molality at 37 °C.
The key comparison reference value xR determined for a temperature at 15 °C and its associated standard uncertainty uR are computed from a weighted mean with dispersion where
xR = 9.13210 uR = 0.00072
CCQM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 5 °C
Degrees of equivalence represented by Di = pai0 - xR and its expanded uncertainty Ui at a 95 % level of confidence (k = 2), both in dimensionless units, where pai0 represents the acidity function at zero chloride molality at 5 °C.
The key comparison reference value xR determined for a temperature at 15 °C and its associated standard uncertainty uR are computed from a weighted mean without dispersion where
xR = 9.42462 uR = 0.00060
CCQM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 50 °C
Degrees of equivalence represented by Di = pai0 - xR and its expanded uncertainty Ui at a 95 % level of confidence (k = 2), both in dimensionless units, where pai0 represents the acidity function at zero chloride molality at 50 °C.
The key comparison reference value xR determined for a temperature at 15 °C and its associated standard uncertainty uR are computed from a weighted mean with dispersion where
xR = 9.05801 uR = 0.00097
CCQM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 15 °C
xi measurement result reported by laboratory i, Labi
ui combined standard uncertainty of xi
CCQM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 25 °C
xi measurement result reported by laboratory i, Labi
ui combined standard uncertainty of xi
CCQM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 37 °C
xi measurement result reported by laboratory i, Labi
ui combined standard uncertainty of xi
CCQM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 5 °C
xi measurement result reported by laboratory i, Labi
ui combined standard uncertainty of xi
CCQM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 50 °C
xi measurement result reported by laboratory i, Labi
ui combined standard uncertainty of xi
