著者
平古 場朗 森木 弘樹 石橋 龍吾 森本 昌宏
出版者
公益社団法人日本薬学会
雑誌
衛生化学 (ISSN:0013273X)
巻号頁・発行日
vol.18, no.5, pp.342-346, 1972
被引用文献数
1

An examination was made on the sensitive spectrophotometric determination of ammonia-nitrogen in water. Ammonia was determined indirectly by measuring the blue complex produced by reaction with potassium iodide-starch reagent and chloramine compound, which was formed by the reaction of ammonia and hypochlorite at pH 5.4. Unreacted hypochlorite was destroyed with ferrous sulfate before addition of potassium iodide-starch reagent. The absorbance of developed color of the blue complex was measured at 570 mμ. The method was applicable for the determination of ammonia-nitrogen in the range of 0.01 to 0.4 ppm, at between 21 and 26°. The standard deviation was 2.2% on an average absorbance 0.496 of a sample containing 0.2 ppm of ammonia-nitrogen.