Deswati
Andalas University, Indonesia
Title: Application response surface methodology for determination optimization of trace zinc in environmental samples by adsorptive stripping voltammetry
Biography
Biography: Deswati
Abstract
Adsorptive stripping voltammetry is one of the stripping voltammetry method that is widely used in the analysis of heavy metals because it has good sensitivity. metals with very small concentrations can be analyzed. The purpose of this study was to obtain the optimum condition of the Zn metal ions simultaneously. To achieve these objectives. required an optimization technique of analytical procedures by using Response Surface Methodology.with Central Composite Design (CCD). The research design was used in this study is a CCD with 4 variables. 3 level and 31 a combination of treatments. The first step of 2k factorial design optimization are: to give the highest level of code values ​​(+1). the lowest level (-1) and code (0) as the center point. Programs that will be used for statistical data processing. namely Mini Tab using RSM. Based on data analysis with response surface method. the obtained optimum conditions for the determination of zinc is: calcon concentration of 0.71 mmol/L; pH = 7.18; accumulation potential -0.56 V and the accumulation time 62.16 s. From the results obtained optimum conditions RSD of 2.5% with a recovery of 98.01%. respectively. Limit of Detection (LOD) for Zn(II) was 1.21 (µg /L). RSM has been successfully applied to the determination of Zn in environmental samples fast and effectively.