浊点萃取-分光光度法测定水中的痕量铜  

Determination of trace copper by spectrophotometry with cloud-point extraction

作　　者：李会玲[1] 吴学敏[1] 包晓玉[1] LI Hui-ling WU Xue-min BAO Xiao-yu(School of Chemistry and Phamaceutical Engineering, Nanyang Normal Univeristy, Nanyang 473061, China)

机构地区：[1]南阳师范学院化学与制药工程学院,河南南阳473061

出　　处：《南阳师范学院学报》2017年第3期18-21,共4页Journal of Nanyang Normal University

摘　　要：在表面活性剂Triton X-114存在下,利用Cu(Ⅱ)与2-(5-溴-2-吡啶偶氮)-5-二乙氨基苯酚(5-Br-PADAP)反应生成疏水性配合物,建立了浊点萃取分光光度法测定痕量铜的方法.在pH=7的磷酸体系缓冲液中,该配合物的最大吸收波长λ_(max)=560nm,ε=2.7×10~5 L·mol^(-1)·cm^(-1),测定铜的线性范围是0.01~0.4μg/mL,相对标准偏差(RSD)为3.5%,加标回收率在95%~102%之间.此法用于实际水样中铜含量的测定,结果令人满意.The cloud point method was proposed to extract and preconcentrate Cu （ Ⅱ） in the river water. The analyte Cu（ Ⅱ ） is complexed with 5-Br-PADAP { 2-（5-bromo-2-py ridy lazo）-5-diethy laminopheno 1t. Triton X-114 is added as a surfactant. At pH 7.0 phosphoric acid buffer solution, the maximum wavelength of absorption of the complex is 560 nm, ε=2.7×105 L·mol-1·cm-1, the linear range of Cu（Ⅱ） is 0.01 -0.35 μg/mL, the relative standard deviations（RSD） is 3.5 % and the standard addition recovery is between 95% - 102%. The method can be applied to the determination of trace copper in water sample with satisfactory results.

关 键 词：Cu(Ⅱ) 浊点萃取 分光光度法 2-(5-溴-2-吡啶偶氮)-5-二乙氨基苯酚 

分 类 号：O611.5[理学—无机化学]