一种催化动力学光度法测定铅的新方法

A New Method of Determination Lead by Catalytic Spectrophotometry

本文基于盐酸介质中 ,在活化剂氨三乙酸存在下 ,铅 (Ⅱ )催化过氧化氢氧化罗丹明B的新的指示反应体系 ,建立了一种灵敏度高的测定痕量铅 (Ⅱ )的新方法 ,其检测限为 1.45× 10 -10 g/mL ,线性范围 0～ 40ng/mL .用于生物样品及河水样品的测定 。

A catalytic spectrophotometric method was proposed for determining Pb(Ⅱ) based on its catalytic effect on the oxidation of rhodamine B by H 2O 2 in the presence of nitrilo triacetic acid as an activator. The detection limit for Pb(Ⅱ) is 1.45×10 -10 g/mL, the linear range of the determination is 0～40 ng/mL. The proposed method has been applied to the determination of trace Pb(Ⅱ) in biologic sample and river water with satisfactory results.