停流-催化分光光度法测定痕量锰

Stopped-Flow Catalytic Spectrophotometric Determination of Trace Manganese

本文用流动注射分析仪,采用停留技术,建立了基于以氨三乙酸(NTA)为助催剂、Mn^(2+)对KIO_4氧化孔雀绿的催化作用测定痕量锰的催化光度法,在0～7.2ng/ml Mn^(2+)呈线性,检测限为0.07ng/ml。用于江湖水中痕量锰的测定,获得满意结果。

A stopped-flow catalytic spectrophotometric method for determining Mn by using a flow injection analyzer has been established. The method is based on the catalytic effect of Mn^(2+)on malachite green-KIO_4 in the presence of nitrilo triacetic acid as an acceterator. A linear range is obtained from 0 to 7. 2ng Mn/ml, and the detection limit of Mn is 0. 07n g/ml. The proposed method has goad selectivity, and has been applied to the determination of Mn river water with satisfactoly results. The relative standard deviation is smaller than 3. 9%.