RESPONSE SURFACE METHODOLOGY OF MULTI-FACTOR WITH ADSORPTIVE CATHODIC STRIPPING VOLTAMMETRY: DETERMINATION OF CHROMIUM(III) USING CALCEINDESWATI, HAMZAR SUYANI, IZZATI RAHMI AND HILFI PARDIAbstract In this study, a multi-factor optimization method was developed to determine Cr(III) using calceinas a ligand with absorptive cathodic stripping voltammetry (AdCSV). The purpose of this study was to find sensitive and selective methods in determining Cr(III). For this reason, we need analytical procedure optimization technique that is using the response surface methodology(RSM). The design of this study used 4 factors/variables, 5 levels/levels and 31 combinations of treatments. The first step of the factorial 2k design optimization is: code the highest level (+1.68),the lowest level (-1.68) and code (0) as the center point. The program used for processing statistical data is Minitab 17. Based on data analysis, the optimum conditions were obtained: calcein concentration 0.50 mM, pH = 4.94, potential accumulation -0.56 V and accumulation time 113.17 s.In this study also determined the relative standard deviation 0.90%, recovery 98.76% and limit of detection 1.24 ìg/L. This method showed good results after applying it to water samples (sea water,rivers, tap water and lake water) using standard addition methods. |