【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。更多还原

【Abstract】 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.更多还原