Preconcentration of Cadmium assisted with sonication using Dowex 50WX2-200 Resin
Abstract
Preconcentration of Cd in water has been carried out using Dowex 50WX2-200 resin as a solid phase extractor. The extraction process was carried out with a sonicator. Elution of Cd which was adsorbed by the resin was released again using 1M HNO3, then Cd was measured using Flame-Atomic Absorption Spectrophotometer. In this study, the effects of pH, sample solutian sonication time, elution time of Cd adsorbed and eluent volume were studied. The results of the optimization of preconcentration conditions were obtained at pH 3, the duration of the sonication process for Cd adsorption was 15 minutes and the elution time was 7.5 minutes and the eluent volume of 1M HNO3 was 10 ml. Method validation was carried out using a Certificate Reference Material, CRM for clean water at optimum conditions. The Accuracy and precision measurement results were obtained 96% recovery and 11% RSD (n=3) which showed the accuracy still in the ranges of acceptance criteria according to the AOAC, between 70% -125 and precision with % RSD < CV Horwitz 14%. Finally, preconcentration of Cd metal in water was successfully with sonicator assisted
Keywords: Cd, Dowex 50WX2-200, Flame-SSA.
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DOI: http://dx.doi.org/10.24845/ijfac.v7.01.21
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