Cloud Point Extraction Combined with Graphite Furnace Atomic Absorption Spectrometry for the Determination of Trace Cd(II)in Environmental Water

A method combining cloud point extraction(CPE)with graphite furnace atomic absorption spectrometry(GFAAS) was proposed for the determination of trace amounts of cadmium in environmental water.Cd(Ⅱ)was quantitatively extracted in the form of coordination complex with 8-oxine by CPE with Triton X-45 as a surfactant-rich phase.The effect of experimental conditions such as pH,concentration of reagents,heating temperature and time on CPE were investigated,and these conditions were optimized efficiently by orthogonal experiment method of L27(313).Under the optimum conditions,agood linearity was observed for cadmium in the range of 0.05-0.50μg/L with the limit of detection of 1.7ng/L and the relative standard deviation of 0.54%,with enhancement factor of 18.4in10 mL sample solution.The proposed method was applied to the determination of cadmium in water samples with the recoveries of 96.2%-101.5%.