Comparison
Comparison close
Results

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).

pH
Di
Participating institutes
Comparison
Comparison close
Results

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
Participating institutes
CCQM-K18.2016
APMP.QM-K18.2016
Comparison
Comparison close
CC comparison
Linked comparison
APMP.QM-K18.2016
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
t-asakai@aist.go.jp
+81 29 861 4162
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
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, COOMET

VNIIFTRI

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

Comparison
Comparison close
Results

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.

 

Comparison
Comparison close
Results

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 iLabi

(xi) combined standard uncertainty of xi

 

 

APMP.QM-K18.2016

xi   reported pH by laboratory iLabi

(xi) combined standard uncertainty of xi