Preconcentration of Cadmium assisted with sonication using Dowex 50WX2-200 Resin

Siti Nuraini, Yuniar Yuniar

Abstract


Preconcentration of Cd metal in water has been carried out using Dowex 50WX2-200 resin as a solid phase extractor. The extraction process is carried out with a sonicator. Elution of Cd metal which was adsorbed by the resin was released again using 1M HNO3, then Cd metal was measured using Atomic Absorption Spectrophotometer. In this study, the effect of pH, solution sonication time and metal elution time and eluent volume was studied.

The results of the optimization of preconcentration conditions were obtained at pH 3, the duration of the sonication process for metal adsorption was 15 minutes and the elution time was 7.5 minutes and the eluent volume of 1M HNO3 was 10 ml. Method validation is carried out using a method validation is carried out using a Certificate Reference Material, CRM for clean water at optimum conditions. Obtained 97% recovery and 11% RSD (n=3) which shows the accuracy value still meets the acceptability limit according to the AOAC between 70%-125 and precision with % RSD smaller than CV Horwitz, 14%.

 

Keywords: Cd, Dowex 50WX2-200, Flame-SSA.


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References


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