Quantificação de atrazina por meio de sensor eletroquímico em águas naturais

Abstract

This research presents the electrochemical study for the application of a gold electrode (EAu) without any alteration of its surface in order to detect the herbicide atrazine by means of square wave voltammetry (SWV) in natural waters without sample preparation. There are several techniques that can perform pesticide analysis in aqueous media. However, the most used are the chromatographic techniques. However, the technical complexity and high cost of the analysis make it necessary to study and monitor through other techniques that can overcome the difficulties of traditional methods. The parameters of the electrochemical technique were optimized. The best voltammetric profiles of atrazine were obtained at pH 1.8 and presented limits of detection (LOD) of 5.33 μmol L-1 and limit of quantification (LOQ) of 17.76 μmol L- 1. Surface water samples from the Lanoso stream in Uberaba - MG were analyzed by voltammetry, as well as by UV-Vis spectrophotometry to compare the results and validate the proposed method. Atrazine concentrations were detected in natural water samples, thus showing the efficiency of EAu use. In this way, it can be concluded that the EAu without surface alteration can be used for the detection of atrazine in natural waters, in a fast, practical way and at a much lower cost than the methods currently used.