テトラヒドロホウ酸ナトリウムとニッケルイオンによる硝酸イオンの還元定量

概要

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Nitrate can be reduced to ammonium ion with sodium tetrahydroborate in the presence of nickel ion and determined by the indophenol method. Fifty milliliters of solution containing nitrate is taken into a 200ml triangular flask. After the addition of a tablet of sodium tetrahydroborate (0.3 g) and 2 ml of nickel chloride solution (10mgNi/ml), the solution is strirred for 60 min at 45℃. The deposited nickel is removed with a membrane filter. The filtrate is made up to 100 ml with water and ammonium ion is determined by the indophenol method. To determine total nitrogen in water samples, this method was applied to nitrate produced by the alkaline peroxodisulfate digestion. The results obtained by this method were in good agreement with those obtained by the cadmium-column method for the determination of total nitrogen in sea and river water.
社団法人日本分析化学会の論文
1992-05-05