Study of spectrophotometric method for determination of trace copper after the separation and enrichment with solid phase extractant-microcrystalline phenolphthalein

作     者：LI QuanMin ZHAO XiaoHong JIANG Kai LIU GuoGuang 

作者机构：The Key Laboratory of Environmental Pollution Control Technology of Henan Province College of Chemistry and EnvironmentalScience Henan Normal University Xinxiang 453007 China 

出 版 物：《Chinese Science Bulletin》 (CHINESE SCIENCE BULLETIN)

年 卷 期：2007年第52卷第1期

页      面：65-70页

核心收录：

学科分类：0817[工学-化学工程与技术] 08[工学] 

基　　金：Supported by the Natural Science Foundation of Henan Province (Grant No. 0511020500) Innovation Project Foundation of University in Henan Province (Grant No. 513) 

主　　题：固态提取物 微晶 酚酞 铜 

摘      要：A new method of using phenolphthalein loaded with 1-(2-pyridylazo)-2-naphthol (PAN) as solid phase extractant to separate and enrich trace copper in diverse water samples has been developed. The ef- fects of different parameters, such as the amounts of PAN and phenolphthalein, stirring time, various salts and metal ions on the enrichment yield of Cu(II) have been investigated to select the experimental conditions. Under the optimum conditions, Cu(II) can be totally adsorbed on the surface of microcrys- talline phenolphthalein. By controlling appropriate acidity (pH=1.0), Cu(II) is completely separated from Cd(II), Pb(II), Mn(II), Co(II), Fe(III), Ni(II), Al(III), Zn(II) and Hg(II) in the solution. The possible reaction mechanism of the enrichment of copper is discussed in detail in this paper. The detection limit of this proposed method is found to be 0.03 μg·L-1 with the enrichment factor of 200. The recovery is in a range of 96.8%―105%. The standard deviation is less than 2.5%. The proposed method has been successfully applied to the determination of trace copper in different water samples with satisfactory results.