Comparison Display

CCQM-K19.2018

MEASURAND pH of borate buffer solutions

NOMINAL VALUE 9.2

TEMPERATURE 15 °C

Degrees of equivalence represented by D_i = pa_i⁰- x_R and its expanded uncertainty U_i at a 95 % level of confidence, both in dimensionless units.

pa⁰at 15 °C

D_i

Participating institutes

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CCQM-K19.2018

MEASURAND pH of borate buffer solutions

NOMINAL VALUE 9.2

TEMPERATURE 25 °C

Degrees of equivalence represented by D_i = pa_i⁰- x_R and its expanded uncertainty U_i at a 95 % level of confidence, both in dimensionless units.

pa⁰at 25 °C

D_i

Participating institutes

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CCQM-K19.2018

MEASURAND pH of borate buffer solutions

NOMINAL VALUE 9.2

TEMPERATURE 37 °C

Degrees of equivalence represented by D_i = pa_i⁰- x_R and its expanded uncertainty U_i at a 95 % level of confidence, both in dimensionless units.

pa⁰at 37 °C

D_i

Participating institutes

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CCQM-K19.2018

MEASURAND pH of borate buffer solutions

NOMINAL VALUE 9.2

TEMPERATURE 5 °C

Degrees of equivalence represented by D_i = pa_i⁰- x_R and its expanded uncertainty U_i at a 95 % level of confidence, both in dimensionless units.

pa⁰at 5 °C

D_i

Participating institutes

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CCQM-K19.2018

MEASURAND pH of borate buffer solutions

NOMINAL VALUE 9.2

TEMPERATURE 50 °C

Degrees of equivalence represented by D_i = pa_i⁰- x_R and its expanded uncertainty U_i at a 95 % level of confidence, both in dimensionless units.

pa⁰at 50 °C

D_i

Participating institutes

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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 D_i = pa_i⁰- x_R and its expanded uncertainty U_i at a 95 % level of confidence, both in dimensionless units.

LAB_i	D_i	U_neg,i	U_pos,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

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CCQM-K19.2018

MEASURAND pH of borate buffer solutions

NOMINAL VALUE 9.2

TEMPERATURE 25 °C

Degrees of equivalence represented by D_i = pa_i⁰- x_R and its expanded uncertainty U_i at a 95 % level of confidence, both in dimensionless units.

LAB_i	D_i	U_neg,i	U_pos,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

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CCQM-K19.2018

MEASURAND pH of borate buffer solutions

NOMINAL VALUE 9.2

TEMPERATURE 37 °C

Degrees of equivalence represented by D_i = pa_i⁰- x_R and its expanded uncertainty U_i at a 95 % level of confidence, both in dimensionless units.

LAB_i	D_i	U_neg,i	U_pos,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

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CCQM-K19.2018

MEASURAND pH of borate buffer solutions

NOMINAL VALUE 9.2

TEMPERATURE 5 °C

Degrees of equivalence represented by D_i = pa_i⁰- x_R and its expanded uncertainty U_i at a 95 % level of confidence, both in dimensionless units.

LAB_i	D_i	U_neg,i	U_pos,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

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CCQM-K19.2018

MEASURAND pH of borate buffer solutions

NOMINAL VALUE 9.2

TEMPERATURE 50 °C

Degrees of equivalence represented by D_i = pa_i⁰- x_R and its expanded uncertainty U_i at a 95 % level of confidence, both in dimensionless units.

LAB_i	D_i	U_neg,i	U_pos,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

CCQM-K19.2018.1

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Information & contact
Participants

Metrology area, Sub-field	Chemistry and Biology, Electrochemistry
Description	pH measurement of borate buffer solutions
Time of measurements	2021 - 2022
Status	Abandoned

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)
Pilot institute	VNIIFTRI Institute of Physical Technical and Radiotechnical Measurements, Rosstandart Russian Federation
Contact person	Narine Oganyan +79017227886
Additional	Sergey Prokunin, Institute of Physical Technical and Radiotechnical Measurements, Rosstandart Toshiaki Asakai, National Metrology Institute of Japan Igor Maksimov, National Metrology Institute of Japan

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 A/S, 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, EURAMET

SNSU-BSN

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

UME	TÜBITAK Ulusal Metroloji Enstitüsü, Türkiye, EURAMET

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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 D_i = pa_i⁰- x_R and its expanded uncertainty U_i at a 95 % level of confidence (k = 2), both in dimensionless units, where pa_i⁰represents the acidity function at zero chloride molality at 15 °C.

The key comparison reference value x_R determined for a temperature at 15 °C and its associated standard uncertainty u_R are computed from a weighted mean with dispersion where

x_R = 9.31263 u_R = 0.00059

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CCQM-K19.2018

MEASURAND pH of borate buffer solutions

NOMINAL VALUE 9.2

TEMPERATURE 25 °C

The key comparison reference value x_R determined for a temperature at 15 °C and its associated standard uncertainty u_R are computed from a weighted mean with dispersion where

x_R = 9.22050 u_R = 0.00073

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CCQM-K19.2018

MEASURAND pH of borate buffer solutions

NOMINAL VALUE 9.2

TEMPERATURE 37 °C

The key comparison reference value x_R determined for a temperature at 15 °C and its associated standard uncertainty u_R are computed from a weighted mean with dispersion where

x_R = 9.13210 u_R = 0.00072

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CCQM-K19.2018

MEASURAND pH of borate buffer solutions

NOMINAL VALUE 9.2

TEMPERATURE 5 °C

The key comparison reference value x_R determined for a temperature at 15 °C and its associated standard uncertainty u_R are computed from a weighted mean without dispersion where

x_R = 9.42462 u_R = 0.00060

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CCQM-K19.2018

MEASURAND pH of borate buffer solutions

NOMINAL VALUE 9.2

TEMPERATURE 50 °C

The key comparison reference value x_R determined for a temperature at 15 °C and its associated standard uncertainty u_R are computed from a weighted mean with dispersion where

x_R = 9.05801 u_R = 0.00097