APPLICATION OF CENTRAL COMPOSITE DESIGN FOR OPTIMIZATION THE DETERMINATION OF LEAD USING ADSORPTIVE CATHODIC STRIPPING VOLTAMMETRY

Deswati, Deswati and Rahmi HG, Izzati and Suyani, Hamzar and Zein, Rahmiana and Alif, Admin (2016) APPLICATION OF CENTRAL COMPOSITE DESIGN FOR OPTIMIZATION THE DETERMINATION OF LEAD USING ADSORPTIVE CATHODIC STRIPPING VOLTAMMETRY. Rasayan Journal of Chemistry, 9 (1). pp. 8-17. ISSN 0974-1496, 0976-0083

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Text Rasayan _Vol.9, No.1, 8-17, Jan.-March, 2016, RJC-1380.pdf Download (1MB) | Preview

Abstract

This paper describes an optimization method for rapid determination of lead from Maninjau lake waters by adsorptive cathodic stripping voltammetry using central composite design. The influence of several parameters were studied : variations of calcon concentration, pH, accumulation potential and accumulation time. The design study was a central composite design with 4 factors/variables 3 levels and 31 treatment combinations. From analysis of variance, concluded to accept the second-order model and a significant effect on the response variable (peak current). Based on central composite design, obtained the optimum conditions of lead were : concentration of calcon 0.76 mM, pH = 5.88, accumulation potential -0.45 Volt and accumulation time 88.38 seconds with a maximum peak current 42.56 nA. This method has been successfully applied to water was obtained : relative standard deviation 1.5%, recovery 97.33%, the linear range 0.2-105 µ g/L, coefficient of determination 0.92 with a detection limit 1.02 µ g/L. Keywords: central composite design, lead, adsorptive cathodic stripping voltammetry

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