催化动力学紫外吸光光度法直接测定水中痕量铜  

KINETIC-CATALYTIC UV-SPECTROPHOTOMETRIC DETERMINATION OF TRACE AMOUNTS OF COPPER IN WATER

作　　者：朱兆富[1] 沈喜海[1] 朱素英[2] 邵丽君[1] 胡永利[1] 

机构地区：[1]河北职业技术师范学院化学系,昌黎066600 [2]唐山师范学院滦州分校,滦县063700

出　　处：《理化检验（化学分册）》2005年第1期30-31,共2页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：以铜(Ⅱ)对过氧化氢氧化抗坏血酸的催化作用为基础,建立了一种催化动力学紫外吸光光度法直接测定水中痕量铜的方法。在pH3.5,0.0014mol·L-1抗坏血酸溶液,0.035mol·L-1过氧化氢溶液的体系中,方法的回收率为98.5%-99.4%,检出限为4μg·L-1。用以测定自来水、河水、生活污水中铜,结果满意。Based on the catalytic action of Cu(Ⅱ) on the oxidation of VC by H2O2, trace amounts of copper (Ⅱ) in water was determined directly by the catalytic UV-photometry. The oxidized form of VC shows an absorption maxima at 243. 8 nm. Linearity relationship was kept between the absorbance of oxidized VC and the concentration of copper(Ⅱ) in the range of 0.1-2. 0 μg per 25 mL of solution. The absorbances are taken at 15 min from the beginning of the reaction at a temperature of 40℃. The reaction takes place in a solution of pH 3. 5 and the concentrations of VC and H2O2 in the solution are 0. 0014 mol·L-1 and 0. 035 mol·L-1 respectively. Recoveries obtained are ranged from 98. 5% to 99. 4%. Detection limit of this method is found to be 4 μg·L-1. The proposed method has been used satisfactorily in the determination of traces of copper in tap water, river water and waste water.

关 键 词：催化动力学光度法 紫外吸光光度法 铜 铜(Ⅱ)-抗坏血酸-过氧化氢体系 水 

分 类 号：O657.31[理学—分析化学]