流动注射-分光光度法分析废水中的微量铜——基于Cu(Ⅱ)对碘离子的氧化作用  

The Determination of Copper in Wastewater by Flow Injectionspectrophotometry:Based on the Oxidation of Cu(Ⅱ) to Iodide Ion

作　　者：代仕均[1] 张新申[2] 杨育杰[1] 孙静[1] 

机构地区：[1]四川大学建筑与环境学院,四川成都610065 [2]四川大学轻纺与食品学院,四川成都610065

出　　处：《皮革科学与工程》2009年第6期53-57,64,共6页Leather Science and Engineering

基　　金：国家863项目(编号:2006AA09Z173)

摘　　要：基于Cu^2＋对I^-的氧化作用，建立了一种高效、操作简便、选择性好的流动注射-分光光度快速分析废水中微量铜的新方法。对显色体系及仪器参数进行了详细的优化，深入讨论了反应温度、淀粉及KSCN对显色反应的影响。实验表明，在最优的实验条件下，该方法具有良好的选择性和抗干扰能力，其线性范围为：10—200mg·L^-1，线性方程：A=4．51（Cu^2＋，mg·L^-1）-29．622，r^2=0．999，检出限（S／N=3）为0．5mg·L^-1，以15次连续进样计，平行测定100mg·L^-1铜的加标水样，相对标准偏差（RSD）为1．10％。该方法测得的实际废水样品中的微量铜与电感耦合等离子发射光谱仪（ICP-OES）的测试结果相一致，且其回收率在97．65％和104．0％之间。A simple and reliable copper determination method is proposed, that combined with the rapid and reproducible flow injection technology without any complicated pre-treatments and additional masking agents. The theory of the proposed method is based on bivalence copper＇ s feeble oxidation action to iodide ion. In the research,chemicals and flow injection variables have been optimized, respectively, and the effects of potassium thiocyanate, amylum and temperature are studied in detail. Experimental results indicate that the proposed method possesses excellent selectivity and anti-interference capacity. The proposed method provides a linearity range over 10 mg · L^-1 to 200 mg · L^-1 ,and the following is linearity equation （A = 4.51 （ Cu^2 ＋, mg · L^-1 ） - 29. 622, r^2 = 0. 999）. The detection limit estimated （ S/N = 3 ） is 0. 5 mg· L ^- 1. The relative standard deviation （RSD） calculated from 15 times repeated injection is 1.10% （Cu^2＋ ,100 mg· L^-1 ）. The method is applied triumphantly to the analysis of different wastewater samples, and the results obtained with the proposed method are comparable with that of obtained by the reference method. The recovery percent is between 97.65% - 104.0% in the determination of real and spiked wastewater samples with the proposed method.

关 键 词：流动注射 分光光度 铜 碘化钾 废水 

分 类 号：X832[环境科学与工程—环境工程]