痕量铁的催化分光光度法研究

Study on Catalytic Spectrophotometric Determination of Trace Iron

研究了在S2SO4介质中，以1，10－二氮菲为活化剂，铁（Ⅲ）催化过氧化氢氧化甲基橙的褪色反应的动力学条件。建立了测定痕量铁（Ⅲ）的动力学分析法。方法的灵敏度1．78×10－8g·L－1，线性范围0～1．2×10－5g·L-1。用于测定饮用水和湖水中的痕量钱，相对标准差在5％以内，平均回收率97％～106％。

A method for determining trace Fe(Ⅲ) is described based on the catalytic effect of trace Fe(Ⅲ)on the decolorizing oxidation reaction of methyl orange by hydrogen peroxide in sulphuric acid medium in the presence of 1, 10-phenanthroline as activator. The sensitivity of the method is 1. 78×10-8g. L-1. The Linear range is 0-1. 2×10-5g·L-1. The method has been used for determining trace Fe(Ⅲ)in drinking water and lake water. The relative standard deviation is within 5 % and recoveries are 97 % - 106 % .