CCQM-K96 and CCQM-K96.1

MEASURAND : Amount content of oxidants as dichromate
NOMINAL VALUE : 3.4 mol/kg

Degrees of equivalence, Di and expanded uncertainty Ui (k = 2), expressed in relative terms

*CENAM results for titration with potentiometric indication

Red diamonds: participants in CCQM-K96
Blue square: participant in CCQM-K96.1

CCQM-K96 and CCQM-K96.1

MEASURAND : Amount content of oxidants as dichromate
NOMINAL VALUE : 3.4 mol/kg

Degrees of equivalence, Di and expanded uncertainty Ui (k = 2), expressed in relative terms

*CENAM results for titration with potentiometric indication

Results are presented under A4 printable format in Summary Results (PDF file).

Comparison
Comparison close
CC comparison
Linked comparison
CCQM-K96
Metrology area, Sub-field Chemistry and Biology, Electrochemistry
Description Assay of potassium dichromate
Time of measurements 2011 - 2012
Status Approved for equivalence
Final Reports of the comparisons
Measurand Amount content of oxidants expressed as potassium dichromate, nominal value 3.4 mol/kg
Transfer device A pure potassium dichromate sample
Comparison type Key Comparison
Consultative Committee CCQM (Consultative Committee for Amount of Substance)
Conducted by CCQM (Consultative Committee for Amount of Substance)
Comments

Results published on 26 July 2013

Assay of potassium dichromate

Pilot institute SMU
Slovensky Metrologicky Ustav
Slovakia
Contact person Michal Mariassy

+421 2 602 94 522
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
Pilot laboratory
SMU

Slovensky Metrologicky Ustav, Slovakia, EURAMET

CENAM

Centro Nacional de Metrologia, Mexico, SIM

INMETRO

Instituto Nacional de Metrologia, Qualidade e Tecnologia, Brazil, SIM

KRISS

Korea Research Institute of Standards and Science, Korea, Republic of, APMP

NIM

National Institute of Metrology, China, APMP

NIST

National Institute of Standards and Technology, United States, SIM

NMIJ AIST

National Metrology Institute of Japan, Japan, APMP

UNIIM

Ural Scientific and Research Institute for Metrology, Rosstandart, Russian Federation, COOMET

CCQM-K96 and CCQM-K96.1

  • Key comparison CCQM-K96

MEASURAND : Amount content of oxidants as dichromate
NOMINAL VALUE : 3.4 mol/kg

The key comparison reference value, xR, is calculated as the weighted mean of all participant results, and its standard uncertainty, uR, is calculated according to the external consistency concept multiplying the uncertainty of the weighted mean by the Birge ratio.

xR = 3.397022 mol/kg and uR = 0.000063 mol/kg

The degree of equivalence of laboratory i with respect to the key comparison reference value is given by a pair of terms: Di = (xi - xR)/xR and Ui, its expanded uncertainty (k = 2), Ui = [2(ui2 + uR2)1/2]/xR, both expressed in relative terms.

  • Key comparison CCQM-K96.1

The NIM (2013) participated in CCQM-K96.1 where KRISS acted as linking institute. The linking procedure is described in the CCQM-K96.1 Final Report.

CCQM-K96 and CCQM-K96.1

  • Key comparison CCQM-K96

MEASURAND : Amount content of oxidants as dichromate
NOMINAL VALUE : 3.4 mol/kg

xi : result of measurement carried out by laboratory i
ui : combined standard uncertainty of xi

*CENAM reported results for titration with potentiometric indication

  • Key comparison CCQM-96.1

MEASURAND : Amount content of oxidants as dichromate
NOMINAL VALUE : 3.4 mol/kg

Laboratory individual measurement results of CCQM-96.1 are given in the CCQM-K96.1 Final Report. The measurements were carried out in 2013.