COULOMETRIC DETERMINATION OF AMOUNT CONTENT OF POTASSIUM DICHROMATE FOR COMPARABILITY ASSESSMENT THROUGH A BILATERAL COMPARISON

P. P. Borges,W. B. Silva Junior, F. B. Gonzaga, A. Sobina, A. Shimolin, G. Terentiev

Abstract

A bilateral comparison between the National Metrology Institute (NMI) from Brazil (INMETRO) and Russia (UNIIM) for determining the amount content of potassium dichromate to assess the comparability of their measurements were performed. Samples of high purity potassium dichromate were exchanged and analysed by the INMs. The technique used was constant-current coulometry. Good comparability for one of the samples was obtained. After bias corrections in their measurements, both INMs will be able to certify reference materials of potassium dichromate that can be used for guaranteeing the quality of redox titrations in their countries.

Keywords

primary standard, potassium dichromate, coulometric titration, certified reference materials

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IMEKO-WC-2012-TC24-P3.pdf

DOI

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IMEKO TC

TC24 - Chemical Measurements

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