催化动力学光度法测定痕量铁(Ⅲ)的研究

Study on Catalytic Kinetic Spectrophotometry for the Determination of Trace Iron(Ⅲ)

研究了在Ｈ２ＳＯ４介质中，Ｆｅ（Ⅲ）催化Ｈ２Ｏ２氧化偶氮胂Ｍ的褪色反应的动力学条件，建立了催化动力学光度法测定痕量铁的新方法。方法的线性范围为０～２．２μｇ／２５ｍｌ，检测限为１．９×１０－１０ｇ／ｍｌ。在用于测定分析纯盐酸和硝权中的痕量铁时，结果满意。

In this paper,the decolouring reaction which results from the oxidation of Arsenazo M by hydrogen peroxide to be catalyzed by Fe(Ⅲ) in the medium of H 2SO 4 is described.The decreasing degree in colour is directly proportional to the concentration of Fe(Ⅲ).The detection limit for Fe(Ⅲ) in this method is 1.9×10 -10 g/ml.The linear response is in the range of 0-2.2μg/25ml.The method has been used to determine iron in HCl and HNO 3 with satisfactory results.