催化动力学光度法测定痕量锰(Ⅱ)的研究

Reseach on catalytic kinetic spectrophotometric determination of trace manganese(Ⅱ)

本文研究了HAc－NaAc缓冲溶液中，在1，10—菲啰啉激活作用下，锰（Ⅱ）对KIO4－KI氧化还原反应的催化动力学条件，建立了催化动力学光度法测定痕量锰（Ⅱ）的方法。该方法检测限为1．27×10－8mol·L－1，锰（Ⅱ）含量在0～5×10－8mol·L－1范围内呈良好线性．用于中药淫羊藿和大青叶中锰（Ⅱ）含量的测定，其结果与原子吸收法基本吻合。

A catalytic kinetic spectrophotometric method has been established for the determination of trace Mn(Ⅱ), based on the catalytic action of Mn(Ⅱ)on the oxidation - reduction reaction between KIO4 and KI in the presence of 1, 10 -phenanthroline and in HAc-NaAc buffer solution. The linear relationship is obeyed in the range of 0～5 ×10-8mol. L-1 for Mn(Ⅱ), and the detection limit of Mn (Ⅱ) is 1. 27 ×10-8mol. L-1. This method has been applied to the determination of trace Mn(Ⅱ) in two kinds of Chinese medicine (Epimedium macranthum Morren et Decaisne and Isatis tinctoria L. ) with satisfactory results.