CCQM-K19.2018 and EURAMET.QM-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 and EURAMET.QM-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 and EURAMET.QM-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 and EURAMET.QM-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 and EURAMET.QM-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 and EURAMET.QM-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 | ||
| SE"Ukrmetrteststandard" | 0.0331 | 0.0049 | ||
| VNIIFTRI | 0.0008 | 0.0035 | ||
| BFKH | 0.0037 | 0.0037 | ||
| BIM | -0.0062 | 0.0047 | ||
| CENAM | 0.0183 | 0.0080 | ||
| GUM | 0.0054 | 0.0034 | ||
| INACAL | 0.0193 | 0.0075 | ||
| INM (CO) | -0.0335 | 0.0411 | ||
| NMI (MD) | 0.0155 | 0.0960 | ||
| IPQ | -0.0022 | 0.0052 | ||
| LACOMET | 0.0006 | 0.0042 | ||
| LNE | -0.0023 | 0.0036 | ||
| NIMT | -0.0127 | 0.0086 | ||
| SASO-NMCC | -0.0946 | 0.0059 | ||
| SNSU-BSN | 0.0165 | 0.0048 | ||
| SE"Ukrmetrteststandard" | 0.0221 | 0.0043 |
CCQM-K19.2018 and EURAMET.QM-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 | ||
| SE"Ukrmetrteststandard" | 0.0279 | 0.0050 | ||
| VNIIFTRI | -0.0001 | 0.0036 | ||
| BFKH | 0.0004 | 0.0037 | ||
| BIM | -0.0068 | 0.0046 | ||
| CENAM | 0.0230 | 0.0055 | ||
| GUM | 0.0005 | 0.0028 | ||
| IBMETRO | -0.0097 | 0.0301 | ||
| INACAL | 0.0127 | 0.0065 | ||
| INM (CO) | -0.0327 | 0.0321 | ||
| NMI (MD) | -0.0007 | 0.0940 | ||
| IPQ | -0.0077 | 0.0043 | ||
| LACOMET | -0.0001 | 0.0040 | ||
| LATU | -0.0047 | 0.0099 | ||
| LNE | -0.0012 | 0.0045 | ||
| NIMT | -0.0164 | 0.0084 | ||
| SASO-NMCC | -0.0017 | 0.0058 | ||
| SNSU-BSN | 0.0123 | 0.0047 | ||
| SE"Ukrmetrteststandard" | 0.0172 | 0.0054 |
CCQM-K19.2018 and EURAMET.QM-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 | ||
| SE"Ukrmetrteststandard" | 0.0227 | 0.0058 | ||
| VNIIFTRI | 0.0004 | 0.0036 | ||
| BFKH | -0.0034 | 0.0039 | ||
| BIM | -0.006 | 0.0046 | ||
| CENAM | 0.0210 | 0.0081 | ||
| GUM | -0.0025 | 0.0031 | ||
| INACAL | 0.0075 | 0.0074 | ||
| INM (CO) | -0.0774 | 0.0391 | ||
| NMI (MD) | 0.0706 | 0.0980 | ||
| IPQ | -0.0064 | 0.0045 | ||
| LACOMET | 0.0009 | 0.0042 | ||
| LNE | -0.0024 | 0.0051 | ||
| NIMT | -0.0231 | 0.0078 | ||
| SASO-NMCC | 0.0871 | 0.0057 | ||
| SE"Ukrmetrteststandard" | 0.0082 | 0.0059 |
CCQM-K19.2018 and EURAMET.QM-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 | ||
| SE"Ukrmetrteststandard" | 0.0408 | 0.0054 | ||
| VNIIFTRI | 0.0007 | 0.0032 | ||
| GUM | -0.0005 | 0.0027 | ||
| NMIJ | -0.0072 | 0.0029 |
CCQM-K19.2018 and EURAMET.QM-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 | ||
| SE"Ukrmetrteststandard" | 0.0242 | 0.0048 | ||
| VNIIFTRI | 0.0002 | 0.0039 | ||
| GUM | -0.0005 | 0.0027 | ||
| NMIJ | -0.0072 | 0.0029 |
| Metrology area, Sub-field | Chemistry and Biology, Electrochemistry |
| Description | pH measurement of borate buffer solutions |
| Time of measurements | 2024 - 2025 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| Measurand | pH ~ 9.2 |
| Parameters | Temperature between 5 °C and 50 °C |
| Transfer device | Samples of borate buffer solution |
| Comparison type | Key Comparison |
| Consultative Committee | CCQM (Consultative Committee for Amount of Substance) |
| Conducted by | EURAMET (European Association of National Metrology Institutes) |
| Comments | Results published 16 December 2025 |
| Pilot institute |
GUM
Glowny Urzad Miar, Central Office of Measures Poland |
| Contact person | Joanna Dumanska +48225819395 |
| Pilot laboratory | |
|---|---|
| GUM |
Glowny Urzad Miar, Central Office of Measures, Poland, EURAMET |
| BFKH |
Government Office of the Capital City Budapest, Hungary, EURAMET |
| BIM |
Bulgarian Institute of Metrology, Bulgaria, EURAMET |
| CENAM |
Centro Nacional de Metrologia, Mexico, SIM |
| IBMETRO |
Instituto Boliviano de Metrología, Bolivia, SIM |
| INACAL |
National Institute for Quality, Peru, SIM |
| INM (CO) |
Instituto Nacional de Metrología de Colombia, Colombia, SIM |
| IPQ |
Instituto Portugues da Qualidade, Portugal, EURAMET |
| LACOMET |
Laboratorio Costarricense de Metrologia, Costa Rica, SIM |
| LATU |
Laboratorio Tecnologico del Uruguay, Uruguay, SIM |
| LNE |
Laboratoire national de métrologie et d'essais, France, EURAMET |
| NIMT |
National Institute of Metrology (Thailand), Thailand, APMP |
| NMI (MD) |
The National Metrology Institute of the Republic of Moldova, Moldova, Republic of, EURAMET |
| NMIJ AIST |
National Metrology Institute of Japan, Japan, APMP |
| PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
| SASO-NMCC |
National Measurement and Calibration Center - Saudi Standards, Metrology and Quality Organization, Saudi Arabia, GULFMET |
| SE "Ukrmetrteststandard" |
State Enterprise "Ukrmetrteststandard", Ukraine, EURAMET |
| SNSU-BSN |
National Measurement Standard - National Standardization Agency of Indonesia, Indonesia, APMP |
This page proposes print-out on A4 paper (portrait) of the comparison details (best printed out using a black and white printer).
Please, select items to be printed out, then click on "OK" :
CCQM-K19.2018 and EURAMET.QM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 15 °C
The key comparison reference value xR and its associated standard uncertainty uR are computed from a weighted mean with dispersion of results obtained using primary method, excluding results of CMI and UkrCSM.
xR = 9.31263 uR = 0.00059
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 dimensionless units:
Di = pai0 - xR and its expanded uncertainty Ui at a 95 % level of confidence (k = 2) (see page 30 of the CCQM-K19.2018 Final report), where pai0 represents the acidity function at zero chloride molality at 15 °C
Linking EURAMET.QM-K19.2018 to CCQM-K19.2018
NMIJ and PTB provide the link between the key comparison CCQM-K19.2018 and EURAMET.QM-K19.2018, having participated in both comparisons. The linking process is described in Section 9 of the EURAMET.QM-K19.2018 Final report.
CCQM-K19.2018 and EURAMET.QM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 25 °C
The key comparison reference value xR and its associated standard uncertainty uR are computed from a weighted mean with dispersion of results obtained using primary method, excluding results of CMI and UkrCSM.
xR = 9.22050 uR = 0.00073
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 dimensionless units:
Di = pai0 - xR and its expanded uncertainty Ui at a 95 % level of confidence (k = 2) (see page 30 of the CCQM-K19.2018 Final report), where pai0 represents the acidity function at zero chloride molality at 25 °C
Linking EURAMET.QM-K19.2018 to CCQM-K19.2018
NMIJ and PTB provide the link between the key comparison CCQM-K19.2018 and EURAMET.QM-K19.2018, having participated in both comparisons. The linking process is described in Section 9 of the EURAMET.QM-K19.2018 Final report.
CCQM-K19.2018 and EURAMET.QM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 37 °C
The key comparison reference value xR and its associated standard uncertainty uR are computed from a weighted mean with dispersion of results obtained using primary method, excluding results of CMI and UkrCSM.
xR = 9.13210 uR = 0.00072
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 dimensionless units:
Di = pai0 - xR and its expanded uncertainty Ui at a 95 % level of confidence (k = 2) (see page 30 of the CCQM-K19.2018 Final report), where pai0 represents the acidity function at zero chloride molality at 37 °C
Linking EURAMET.QM-K19.2018 to CCQM-K19.2018
NMIJ and PTB provide the link between the key comparison CCQM-K19.2018 and EURAMET.QM-K19.2018, having participated in both comparisons. The linking process is described in Section 9 of the EURAMET.QM-K19.2018 Final report.
CCQM-K19.2018 and EURAMET.QM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 5 °C
The key comparison reference value xR and its associated standard uncertainty uR are computed from a weighted mean without dispersion of results obtained using primary method, excluding results of CMI and UkrCSM.
xR = 9.42462 uR = 0.00060
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 dimensionless units:
Di = pai0 - xR and its expanded uncertainty Ui at a 95 % level of confidence (k = 2) (see page 30 of the CCQM-K19.2018 Final report), where pai0 represents the acidity function at zero chloride molality at 5 °C
Linking EURAMET.QM-K19.2018 to CCQM-K19.2018
PTB provides the link between the key comparison CCQM-K19.2018 and EURAMET.QM-K19.2018, having participated in both comparisons. The linking process is described in Section 9 of the EURAMET.QM-K19.2018 Final report.
CCQM-K19.2018 and EURAMET.QM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 50 °C
The key comparison reference value xR and its associated standard uncertainty uR are computed from a weighted mean with dispersion of results obtained using primary method, excluding results of CMI and UkrCSM.
xR = 9.05801 uR = 0.00097
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 dimensionless units:
Di = pai0 - xR and its expanded uncertainty Ui at a 95 % level of confidence (k = 2) (see page 30 of the CCQM-K19.2018 Final report), where pai0 represents the acidity function at zero chloride molality at 50 °C
Linking EURAMET.QM-K19.2018 to CCQM-K19.2018
PTB provides the link between the key comparison CCQM-K19.2018 and EURAMET.QM-K19.2018, having participated in both comparisons. The linking process is described in Section 9 of the EURAMET.QM-K19.2018 Final report.
CCQM-K19.2018 and EURAMET.QM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 15 °C
CCQM-K19.2018
xi measurement result reported by laboratory i, Labi
ui combined standard uncertainty of xi
| Labi | xi | ui | |
| (dimensionless) | (dimensionless) | ||
| BFKH | 9.3110 | 0.0027 | |
| BIM | 9.3147 | 0.0018 | |
| CMI | 9.3012 | 0.0012 | |
| GUM | 9.3096 | 0.0014 | |
| INMETRO | 9.3149 | 0.0010 | |
| LATU | 9.3277 | 0.0056 | |
| NIM | 9.3135 | 0.0017 | |
| NIMT | 9.3147 | 0.0053 | |
| NMIJ | 9.3113 | 0.0011 | |
| PTB | 9.3116 | 0.0007 | |
| SMU | 9.3150 | 0.0013 | |
| SE"Ukrmetrteststandard" | 9.3457 | 0.0024 | |
| VNIIFTRI | 9.3134 | 0.0017 |
EURAMET.QM-K19.2018
The measurement results are listed in in Section 7 of the EURAMET.QM-K19.2018 Final report.
CCQM-K19.2018 and EURAMET.QM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 25 °C
CCQM-K19.2018
xi measurement result reported by laboratory i, Labi
ui combined standard uncertainty of xi
| Labi | xi | ui | |
| (dimensionless) | (dimensionless) | ||
| BFKH | 9.2125 | 0.0031 | |
| BIM | 9.2245 | 0.0019 | |
| CMI | 9.2032 | 0.0012 | |
| GUM | 9.2177 | 0.0013 | |
| IBMETRO | 9.2680 | 0.0050 | |
| INMETRO | 9.2234 | 0.0014 | |
| INTI | 9.2244 | 0.0400 | |
| LATU | 9.2351 | 0.0056 | |
| NIM | 9.2205 | 0.0017 | |
| NIMT | 9.2125 | 0.0042 | |
| NMIJ | 9.2195 | 0.0011 | |
| PTB | 9.2205 | 0.0007 | |
| SMU | 9.2232 | 0.0016 | |
| SE"Ukrmetrteststandard" | 9.2484 | 0.0024 | |
| VNIIFTRI | 9.2204 | 0.0017 |
EURAMET.QM-K19.2018
The measurement results are listed in in Section 7 of the EURAMET.QM-K19.2018 Final report.
CCQM-K19.2018 and EURAMET.QM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 37 °C
CCQM-K19.2018
xi measurement result reported by laboratory i, Labi
ui combined standard uncertainty of xi
| Labi | xi | ui | |
| (dimensionless) | (dimensionless) | ||
| BFKH | 9.1255 | 0.0019 | |
| BIM | 9.1356 | 0.0018 | |
| CMI | 9.1189 | 0.0014 | |
| GUM | 9.1296 | 0.0013 | |
| INMETRO | 9.1344 | 0.0013 | |
| LATU | 9.1497 | 0.0053 | |
| NIM | 9.1292 | 0.0017 | |
| NIMT | 9.1267 | 0.0044 | |
| NMIJ | 9.1317 | 0.0011 | |
| PTB | 9.1327 | 0.0006 | |
| SMU | 9.1344 | 0.0018 | |
| SE"Ukrmetrteststandard" | 9.1548 | 0.0028 | |
| VNIIFTRI | 9.1325 | 0.0017 |
EURAMET.QM-K19.2018
The measurement results are listed in in Section 7 of the EURAMET.QM-K19.2018 Final report.
CCQM-K19.2018 and EURAMET.QM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 5 °C
CCQM-K19.2018
xi measurement result reported by laboratory i, Labi
ui combined standard uncertainty of xi
| Labi | xi | ui | |
| (dimensionless) | (dimensionless) | ||
| GUM | 9.4236 | 0.0016 | |
| PTB | 9.4247 | 0.0007 | |
| SE"Ukrmetrteststandard" | 9.4654 | 0.0026 | |
| VNIIFTRI | 9.4253 | 0.0017 |
EURAMET.QM-K19.2018
The measurement results are listed in in Section 7 of the EURAMET.QM-K19.2018 Final report.
CCQM-K19.2018 and EURAMET.QM-K19.2018
MEASURAND pH of borate buffer solutions
NOMINAL VALUE 9.2
TEMPERATURE 5 °C
CCQM-K19.2018
xi measurement result reported by laboratory i, Labi
ui combined standard uncertainty of xi
| Labi | xi | ui | |
| (dimensionless) | (dimensionless) | ||
| GUM | 9.0537 | 0.0014 | |
| PTB | 9.0586 | 0.0006 | |
| SMU | 9.0595 | 0.0017 | |
| SE"Ukrmetrteststandard" | 9.0822 | 0.0022 | |
| VNIIFTRI | 9.0582 | 0.0018 |
EURAMET.QM-K19.2018
The measurement results are listed in in Section 7 of the EURAMET.QM-K19.2018 Final report.
