Abstract
A cloud point extraction (CPE) system for the graphite furnace atomic absorption spectrometric (GFAAS) determination of Pt(IV) has been developed. The procedure is based on the complexation of Pt(IV) with 4-(p-chlorophenyl)-1-(pyridin-2-yl)thiosemicarbazide (HCPTS) in the presence of Triton X-114 as a non-ionic surfactant. The optimum conditions for the procedure were investigated with respect to several experimental parameters such as pH of the solution, Triton X-114 and HCPTS concentrations, incubation time and temperature, and centrifugation rate and time. Under the optimum experimental conditions, the calibration curve was linear up to 50 ng mL−1 with a detection limit of 0.25 ng mL−1 and the enrichment factor was 47. No considerable interference was observed due to the presence of coexisting anions and cations. The accuracy of the results was verified by analyzing the spiked water from different sources (tap, river, brackish, sea and industrial waste water). The proposed method has been applied for the determination of Pt(IV) in some real samples such as food and geological samples with satisfactory results.
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