过氧化氢——茜素体系催化光度法测定痕量铜的研究  

Spectrophotometric and catalytic determination of trace amounts of copper with the system of H_2O_2 and alizarin

作　　者：莎仁[1] 

机构地区：[1]内蒙古师范大学化学与环境科学学院,内蒙古呼和浩特010022

出　　处：《宝鸡文理学院学报（自然科学版）》2005年第3期191-194,共4页Journal of Baoji University of Arts and Sciences(Natural Science Edition)

基　　金：内蒙古自然科学基金资助项目(200408020213)

摘　　要：研究了催化动力学褪色光度法测定痕量铜(Ⅱ)的新体系,反应介质为NH3·H2ONH4Cl缓冲溶液(pH=10.0),催化体系为痕量Cu(Ⅱ)催化H2O2氧化茜素的褪色反应。考察了反应体系的适宜条件、动力学性质及28种干扰离子的影响,建立了一种催化动力学光度法测定痕量铜的新指示反应。本法的线性范围为0～1.2×10-7g/mL,其灵敏度远远高于普通光度法,检出极限为1.76×10-10g/mL,可应用于农产品和蒙药中铜的测定,相对标准偏差为1.1%～3.2%。A new system was investigated for the determination of trace Cu（Ⅱ） with the kinetic spectrophotometric method. Buffer medium is ammonia and ammonia chloride solution （pH=10.0）.It had been found that the decolouring oxidation of alizarin by hydrogen peroxide using trace Cu（ Ⅱ ） as catalyst was investigated. The suitable condition and kinetic character were studied. A new spectrophotometric method for the determination of trace Cu（ Ⅱ ） was developed. The selectivity of the method is relatively high. Many foreign ions don＇t interfere with the determination of Cu（ Ⅱ）. The linear range is 0～1.2×10^-7g/mL. A detection limit of 1.76× 10^-10g/mL. The measurement of trace Cu（Ⅱ） was applied to agricultural product samples and Mongolian medicine samples. The relative standard deviations （RSD） were between 1.1～3.2％。

关 键 词：铜(Ⅱ) 催化动力学光度法 茜素 蒙药 

分 类 号：O657.32[理学—分析化学]