Colorimetric Determination of Nitrates.I.:1.Critical Study of the Methods Using Concentrated Sulfuric Acid 2.A Method Using Chromotropic Acid
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Coloration reactions of nitrate with many organic reagents in concentrated sulfuric acid solution are investigated, among which new methods using chromotropic acid, Direct Rhoduline Red RH, and Chrome Blue Black R are described.The result of further investigation of chromotropic acid method indicated that the quantitative estimation of NO<SUB>3</SUB><SUP>-</SUP> amounting above 1γ/cc is possible by using 20 cc total sample containing sulfuric acid and water at the ratio of 3:1 by volume, but the solution does not follow Beer's law above the concentration of 10γ/cc.The presence of NO<SUB>2</SUB><SUP>-</SUP>up to 3γ/cc does not interfere the reaction, above which it is necessary to decompose it.
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- Colorimetric Determination of Nitrates.I.:1.Critical Study of the Methods Using Concentrated Sulfuric Acid 2.A Method Using Chromotropic Acid
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