Accuracy in Gravimetric Determination of Nitrate and Nitrite as Nitron Nitrate

Akiharu HIOKI; Tsutomu WATANABE; Kuniko TERAJIMA; Noriko FUDAGAWA; Masaaki KUBOTA; Akira KAWASE

doi:10.2116/analsci.6.757

Akiharu HIOKI, Tsutomu WATANABE, Kuniko TERAJIMA, Noriko FUDAGAWA, Masaaki KUBOTA, Akira KAWASE

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Keywords: Nitron method, gravimetry, nitrate ion reference solution, nitrite ion reference solution, coulometric titration, ion chromatography, precision, accuracy

JOURNAL FREE ACCESS

1990 Volume 6 Issue 5 Pages 757-762

DOI https://doi.org/10.2116/analsci.6.757

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Abstract

The accuracy of nitron-method gravimetry for the determination of the purity of potassium nitrate and that of sodium nitrite was studied. The gravimetry of potassium nitrate was compared with that of nitric acid determined by an acidimetric coulometric titration. The concentration of nitrate ions left in the filtrate of the nitron nitrate precipitate was measured by ion chromatography. A method for the oxidation of nitrite ions to nitrate ions by permanganate ions was studied for the purpose of the application of the nitron-method to the determination of the purity of sodium nitrite. The small quantity of nitrate ions contained in sodium nitrite was determined by ion chromatography.

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