Simultaneous voltammetric determination of captan, carbosulfan, 2,3,7,8-tetrachlorodibenzodioxin and pentachlorophenol in groundwater by ceria nanospheres decorated platinum electrode and chemometrics

Abstract

In this work, a linear sweep voltammetry method has been proposed for the estimation of captan, carbosulfan, 2,3,7,8-tetrachlorodibenzodioxin and pentachlorophenol using ceria nanospheres modified platinum electrode. The reduction peaks of captan and carbosulfan observed in the linear sweep voltammograms overlapped strongly and it was difficult to estimate captan and carbosulfan individually from their mixtures. Gaussian curve fitting algorithm was used to facilitate the resolution of complex linear sweep voltammograms. Quantitative analysis for each of the pesticides in a mixture was studied with the help of linear regression analysis. The analytical performance of the calibrated models was investigated with the aid of relative prediction error (RPE), root mean square error for cross validation (RMSECV) and recovery. The proposed calibrated models were then applied for the estimation of the four pesticides in several ground water samples, where the RPE, recovery and RMSECV of the spiked samples were within the acceptable limit.