马勃等中草药中痕量铁的分析

Dtermination of Trace Iron(Ⅲ) in Lasiosphaera Seu Calvatia and Other Chinese Herbal Medicines

本文应用Fe(Ⅲ)在硫酸介质中催化过氧化氢氧化甲基红褪色的反应,测定了几种中草药中痕量Fe(Ⅲ)的含量。Fe(Ⅲ)含量在0.1～0.5μg/25ml范围内符合Beer定律。RSD为3.37％,检测限3.23×10^(10)g/ml,平均回收率为99.76％。

Trace iron(Ⅲ) was determined in Iasiosspaera Seu Calvatia andorther several kinds of Chinese herbal medicine by iron(Ⅲ) in sulphuric acid solution catalyzing the decolorizing reaction which results from the oxidation of methyl red by hygrogen peroxide. The Beer's law was obeyed in the range of 0. 1-0. 5μg/25ml for iron(Ⅲ) . The RSD is 3.37%,the detection limit is 3.23×1(0-10g/ml and the average rate of recoverry is 99.76%.