催化动力学光度法测定痕量铜Ⅱ  

Determination of Trace Copper(Ⅱ) by Catalytic Kinetic Spectrophotometry

作　　者：王旭珍[1] 庞秀江[1] 朱启秀[1] 王玉宝[1] 张秀香[1] 

机构地区：[1]烟台师范学院化学系，烟台 264025

出　　处：《分析化学》2001年第8期907-909,共3页Chinese Journal of Analytical Chemistry

摘　　要：研究了在磷酸介质中 ,铜 催化过氧化氢氧化偶氮胂Ⅰ褪色反应的适宜条件与影响因素 ,建立了动力学光度法测定痕量铜 的新方法。方法线性范围为 0～ 1 0 0 μg L ,检出限为 2 .79× 1 0 - 9g mL。该催化反应对Cu 为一级反应 ,表观活化能为 65 .6kJ mol,表观反应速率常数为 9.63× 1 0 - 4s- 1 。用于水样、电镀液和发样中铜 的测定 ,相对标准偏差为 0 .7%～ 4.7% ,标准加入回收率为 97.8%～ 1 0 4.2 %。A catalytic reaction for the determination of trace copper? was established based on the fact that Cu 2+ could catalyze the discolouring oxidation reaction of arsenazo I by H 2O 2 in the medium of H 3PO 4. The influential factors of reaction and the optimum conditions for the determination of Cu 2+ were investigated in detail. The linear range of the determination was 0～100 μg/L and detection limit was 2.79×10 -9 g/mL. The reaction was the first-order on copper? and the apparent activation energy was found to be 65.6 kJ/mol, and the rate constant was 9.63×10 -4 s -1 . The method has been applied to determine Cu? in water samples, plating liquid and human hair with the relative standard deviation of 0.7%～4.7% and recovery of 97.8%～104.2%.

关 键 词：铜(Ⅱ) 偶氮胂(Ⅰ) 催化光度法 痕量分析 过氧化氢 褪色反应 

分 类 号：O657.3[理学—分析化学]