Determination of Nitrate Nitrogen by the Strong Phosphoric Acid-Iodic Acid Decomposition Method

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Abstract
(1) The strong phosphoric acid-iodic acid decomposition method for the determination of nitrogen in organic compounds, which was already reported, has been extended to the analysis of nitrate nitrogen. (2) In a reaction vessel salicylic acid was nitrated by heating with the sample and concentrated sulfuric acid and the product was reduced by heating with sodium thiosulfate. The resulting mixture was decomposed by heating with a mixture of strong phosphoric acid and potassium iodate. The liberated Kiba for his interest and encouragement, nitrogen was measured gas-volumetrically. (3) In the presence of nitrate, ammonium defrayed from a grant given by the Ministry salt, and urea, the total nitrogen and the nitrogen except nitrate could be determined are due. by the strong phosphoric acid-iodic acid decomposition method, respectively.

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