Abstract

Deswati1¹*, Izzati Rahmi H.G², Hamzar Suyani¹, Rahmiana Zein¹ and Admin Alif¹

DOI : http://dx.doi.org/10.13005/ojc/320323

This work describes a procedure for the  simultaneous determination of cadmium in fruit and vegetable samples using adsorptive stripping voltammetry of complexes   with calcon at a hanging mercury drop electrode (HMDE) has been optimized using central composite design (CCD). The selection of the experimental conditions  was made using experimental of  the  influence  of  several  parameters  were  studied  : variations of calcon concentration, pH, accumulation potential and accumulation time. The design experiment was a central composite design with 4 factors/variables, 3 levels and 31 treatment combinations. From analysis of variance, it was decided to accept the second-order model and the independent variable, concluded that a significant effect on the response variable (peak current). Based on data analysis with central composite design, the determination of cadmium obtained optimum conditions were :  calcon concentration  0.8435 mM,  pH  8.0047, accumulation potential  -0.6346  Volt  and accumulation time 81.85 seconds with a  maximum peak current 61.8146 nA. At the optimum condition were obtained relative standard deviation  0.84%, recovery 98.88%, the linear range up to 110 µg/L,  limit of detection 1.009 µg/L and LOQ  3.363 µg/L.  The procedure was successfully applied to the determination of cadmium  in fruit and vegetable samples without prior treatment.

simultaneous; cadmium; adsorptive stripping voltammetry; fruit and vegetable samples; central composite design

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