催化分光光度法测定痕量铜(Ⅱ)的研究

A Study of Catalytic Kinetics Spectrophotometry for Determining Trace Copper(Ⅱ)

关键词:  铜(Ⅱ)  催化分光光度法  溴甲酚紫  氯化钾

Key words:  copper (Ⅱ)  catalytic spectrophotometry  bromocresol purple  potassium chloride

摘要:

在稀氨水溶液中,以KCl溶液为活化剂,过氧化氢与溴甲酚紫的氧化还原反应多铜(Ⅱ)催化,而使吸光度值降低,据此建立了痕量铜的新催化动力学光度法。方法的摩尔吸光系数为5.28×10⁵L·mol^-1·cm^-1,检出限为4.44×10^-9g/mL,线性范围为0~0.6μg/25mL,已用于桂林风景点水中痕量铜(Ⅱ)的测定,结果满意。

Abstract:

A new catalytic spectrophotometric method for determining trace copper(Ⅱ) has been developed.The method is based on the catalytic oxidation of bromocresol purple by H₂O₂ in the media of ammonia water and KCl as an activator.The molar absorption coefficient is 5.28×10⁵ L·mol^-1.cm^-1. The limit of detemination is 4.44×10^-9 g/mL. The linear range of determination is 0~0.6 μg/25 mL for copper(Ⅱ).The method has been used to determine trace copper(Ⅱ) in water from scenic spots of Guilin. The results were satisfactory.