Cloud point extraction preconcentration and ICP-OES determination of trace chromium and copper in water samples

摘要

A new method is proposed for the determination of trace chromium and copper in water samples by inductively coupled plasma optical emission spectrometry after cloud point extraction (CPE). The method is based on the complexation of metal ions with 8-hydroxyquinoline in the presence of non-ionic micelles of Triton X-100. The effect of experimental conditions such as pH, concentration of chelating agent and surfactant, equilibration temperature and time on cloud point extraction was studied. Under the optimum conditions, the detection limits were 1.29 and 1.31 ng mL(-1) for chromium and copper, respectively, with relative standard deviations of 4.3% and 4.8%, respectively (n=11). The proposed method was applied to the determination of trace chromium and copper in water samples with satisfactory results. [References: 26]