污水中铬(Ⅲ)的催化动力学分析法研究

Investigation for Kinetic Determination of Chromium (Ⅲ) in Waste

本文提出了催化动力学法测Cr(Ⅲ)的新体系,并建立了相应的分析方法,实验结果表明:过氧化氢氧化苯胺的过程可被微量的Cr(Ⅲ)所催化。当苯胺浓度为0.028M,过氧化氢为0.8M,Cr(Ⅲ)浓度在0.02—1ppm之间,于80℃水浴中反应30分钟,停止反应,在400nm处测定反应产物的吸光度,从而计算出水中微量Cr(Ⅲ)离子浓度。

A new system for the determination of Cr(Ⅲ) by kinetic method is described in this paper,and a relevant measuring method is established. The method is based on the catalytic effect of Cr(Ⅲ) upon the reaction of hydrogen peroxide with aromatic amine. The molar absorptivity is 1.7×10~5l.mol^(-1)cm^(-1)when concentration of aromatic amine is 0.028M and H_2O_2 is 0.8M at 80℃, reacted for 30 min.. The method is simple, sensitive and selective. A satisfactory result is obtained in the determination of waste water, river water and drinking water samples.