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International Journal of Electrochemistry
Volume 2014, Article ID 308926, 9 pages
http://dx.doi.org/10.1155/2014/308926
Research Article

Electroanalytical Methodology for the Direct Determination of 2,4-Dichlorophenoxyacetic Acid in Soil Samples Using a Graphite-Polyurethane Electrode

Brazilian Agricultural Research Corporation, Embrapa Instrumentation, Rua XV de Novembro 1452, 13560-970, São Carlos, SP, Brazil

Received 2 November 2013; Accepted 6 February 2014; Published 16 March 2014

Academic Editor: Davood Nematollahi

Copyright © 2014 Fernanda Ramos de Andrade et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

An electroanalytical methodology was developed for the direct determination of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) using a graphite-polyurethane composite electrode and square wave voltammetry (SWV). 2,4-D exhibited one reduction peak with characteristics of an irreversible process at −0.54 V (versus Ag/AgCl), which is controlled by the diffusion of the reagent on the electrode surface. After the experimental parameters optimization (pH 2.0,  s−1,  V, and  V), analytical curves were constructed in the range of 0.66 mg L−1 to 2.62  mg L−1. Detection (LD) and quantification (LQ) limits were 17.6  g L−1 and 58.6  g L−1, respectively. The methodology was successfully applied to measure the percolation of the herbicide 2,4-D in undisturbed soil columns of different granulometric compositions.