摘要
在pH值为7.6的磷酸二氢钾-硼砂缓冲介质中,痕量铜(Ⅱ)可灵敏地催化H2O2氧化N,N-二甲基苯胺(DMA)与3-甲基-2-苯并噻唑-酮腙(MBTH)的氧化还原显色反应.研究了该反应的最佳条件,建立了催化动力学分光光度法测定痕量铜的新方法.该方法的线性范围为(1.5~7.7) μg/L,检出限为0.463 0 μg/L.该法被用于测定水样中铜的含量,获得满意结果.
A spectrophotometric method was developed for the determination of ultratrace amounts of copper (Ⅱ) based on its catalytic effect on the oxidative coupling reaction of 3 - methyl - benzothiazolinone hydrozone with N, N - Dimethylaniline to produce an intensely colourd dye ( ( max = 590 nm) in the presence of hydrogen peroxide. In this reaction, 1,10 - Phenanthroline acted as an effective activator for the catalysis of copper(Ⅱ). By measuring the absorbance of the dye, copper(Ⅱ) can be determined at the ( 1.5 - 7.7 ) μg/L level. The detection limit was 0.46 μg/L. The proposed method was successfully applied to the determination of copper(Ⅱ) in some water samples.
出处
《南昌大学学报(理科版)》
CAS
北大核心
2005年第6期511-513,共3页
Journal of Nanchang University(Natural Science)
基金
国家自然科学基金资助项目(20365002和20562009)
江西省自然科学基金资助项目(0320014)
中国科学院长春应用化学研究所电分析化学重点实验室项目(SKLEAC2004-3)
关键词
催化动力学
分光光度法
铜
catalytic kinetics method
spectrophotometry
copper