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.

pa0 at 15 °C
Di
Participating institutes

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.

pa0 at 25 °C
Di
Participating institutes

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.

pa0 at 37 °C
Di
Participating institutes

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.

pa0 at 5 °C
Di
Participating institutes

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.

pa0 at 50 °C
Di
Participating institutes

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
Participating institutes
CCQM-K19.2018

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
Participating institutes
CCQM-K19.2018

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
Participating institutes
CCQM-K19.2018

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
Participating institutes
CCQM-K19.2018

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
Participating institutes
CCQM-K19.2018
Comparison
Comparison close
CC comparison
Linked comparison
CCQM-K19.2018.1
Metrology area, Sub-field Chemistry and Biology, Electrochemistry
Description pH measurement of borate buffer solutions
 
Time of measurements 2021 - 2022
Status Measurements in progress
Measurand pH
~ 9.2
Parameters Temperature : 15 °C, 25 °C, 37 °C and optionally at 5 °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 This key comparison is a subsequent comparison of CCQM-K19.2018 and is organized for institutes that could either not participate in in CCQM-K19.2018 or that could not provide a result in due time due to COVID-19. However, institutes that have participated in in the first comparison, but like to improve their performance might also participate.
Pilot institute VNIIFTRI
Institute of Physical Technical and Radiotechnical Measurements, Rosstandart
Russian Federation
Contact person Narine Oganyan

+79017227886
Additional
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
Pilot laboratory
VNIIFTRI

Institute of Physical Technical and Radiotechnical Measurements, Rosstandart, Russian Federation, COOMET

CENAM

Centro Nacional de Metrologia, Mexico, SIM

CMI

Czech Metrology Institute, Czechia, EURAMET

DFM

Danish Fundamental Metrology Ltd, Denmark, EURAMET

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

LATU

Laboratorio Tecnologico del Uruguay, Uruguay, SIM

NIMT

National Institute of Metrology (Thailand), Thailand, APMP

NIST

National Institute of Standards and Technology, United States, SIM

NMIJ AIST

National Metrology Institute of Japan, Japan, APMP

PTB

Physikalisch-Technische Bundesanstalt, Germany, EURAMET

SE "Ukrmetrteststandard"

State Enterprise "Ukrmetrteststandard", Ukraine, COOMET

SNSU-BSN

National Measurement Standard - National Standardization Agency of Indonesia, Indonesia, APMP

UME

TÜBITAK Ulusal Metroloji Enstitüsü, Türkiye, EURAMET

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 iLabi

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 iLabi

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 iLabi

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 iLabi

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 iLabi

ui   combined standard uncertainty of xi