ABTT浊点萃取分光光度法测定水样中镉  

Determination of trace cadmium in water samples by spectrophotometry with cloud point extraction

作　　者：王慕华[1] 郑云法[1] 张晓燕[1] 张春牛[1] 

机构地区：[1]浙江丽水学院化学系,丽水323000

出　　处：《分析试验室》2011年第10期31-33,共3页Chinese Journal of Analysis Laboratory

基　　金：浙江省教育厅科研计划项目(Y201018676)资助

摘　　要：利用非离子表面活性剂Triton X-114在温度高于其浊点时形成相分离行为,建立了浊点萃取-分光光度法测定水样中痕量镉的新方法,优化了以1-偶氮苯-3-噻唑-三氮烯(ABTT)为显色剂,Triton X-114浊点萃取富集痕量镉的实验条件。在最大吸收波长λ=520 nm,其表观摩尔吸光系数为6.84×105L.mol-1.cm-1,线性范围为0～0.36μg/mL,相关系数为0.9994。在优化的实验条件下,进行了痕量镉的分析,加标回收率为97.0%～105.3%,方法应用于水样中痕量镉的测定,结果满意。A new method for the determination of trace Cadmium in water samples by spectrophotometry with cloud point extraction（CPE） was developed.The non-ionic surfactant Triton X-114 can be separated into two phases by heating to its cloud point.The optimum experiment conditions with Triton X-114 as a surfactant and 1-azobenzene-3-thiazoly-triazene（ABTT） as a complexing agent were discussed.The maximum absorption wavelength of the complex is 520 nm.The apparent molar absorptivity was 6.837×105L·mol-1·cm-1.Beer＇s law was obeyed for cadmium in the range of 0~0.36μg/mL with correlation coefficient of 0.9994.Under the optimal experiment conditions,the recoveries of cadmium were 97.0%~105.3%.The method has been applied to the direct determination of cadmium in water samples with satisfactory results.

关 键 词：浊点萃取 分光光度法 镉 水样 

分 类 号：O657.3[理学—分析化学]