以酸性铬蓝K为指示剂催化光度法痕量锰的测定

Catalytic Spectrophotometric Detemination of Trace Manganese with Acid Chrome Blue K as Indicator

本文研究了痕量锰（Ⅱ）催化过硫酸铵氧化酸性铬蓝Ｋ而褪色的最佳条件，拟定酸性铬蓝Ｋ为指示反应催化光度法测定人参、水质中痕量锰（Ⅱ）的新方法。不去灵敏度高，重现性较好，在０～２６ｎｇ／２５ｍＬ范围内铬蓝Ｋ的褪色反应速度与Ｍｎ（Ⅱ）含量呈线性关系。

A simple，sensitive and accurate catalytic spectrophotometric method for the determination of manganese is described The method is based on the decolourisation of ammonium persulphate-catalysed oxidation of acid chrome blue K with manganese（ Ⅱ ）．The absorbance of the standard solution is measured at 550nm against reagent blank．Tle molar a bsorptivity is 1．34 ×10~6．The method can be applied for det-ermimination of trace manganese in ginseng and the results is satisfactory.