Optimization for the Simultaneous Determination of Zinc in Environmental Samples With Calcon by Adsorptive Stripping Voltammetry : Response Surface Methodology

A procedure for the optimization simultaneous determination zinc by adsorptive stripping voltammetry has been done. The purpose of this study was to obtain the optimum condition of zinc simultaneously. To achieve these objectives, required an optimization technique by using response surface methodology (RSM), with central composite design (CCD). The research design was used CCD with 4 variables, 3 level and 31 a combination of treatments. The first step of 2k factorial design optimization is: to give the highest level of code values (+1), the lowest level (-1) and code (0) as the center point. Programs have been used for statistical data processing, namely Minitab using RSM. Based on data analysis, the obtained optimum conditions for the simultaneous determination of zinc is the calcon concentration of 0.7018 mmol/L; pH = 7.1845; accumulation potential -0.5628 V, and the accumulation time 62.16 s. The optimum conditions obtained relative standard deviation (RSD) 2.5%, recovery of 98.01%,linier range (0.2-105) µg/L, and limit of detection (LOD) 1.21 (µg/L). This RSM has been successfully applied to the simultaneous determination of zinc in environmental samples.