Estudo de contaminação de solo por agrotóxico ácido 2,4-diclorofenoxiacético

Abstract

The application of agrochemicals to increase the supply of food to the population has become a widespread practice, with 2,4-dichlorophenoxyacetic acid being one of the most commercialized products for this purpose. However, these contaminants accumulate in the environmental compartments, mainly soil and water, due to their inadequate application. In this study the adsorption of the 2,4-D in the soil Humic Aluminoferric Red Latosol was evaluated for three concentrations and a kinetic study was applied applying kinetic models. In addition, the impacts caused by the use of heterogeneous Fenton reactions on the degradation of the contaminant on the physical, chemical and microbiological characteristics in the study soil were also evaluated. The kinetic study showed that adsorption of 2,4-D by the soil is described by the kinetic models of pseudo-second order and by intraparticle diffusion and that at lower concentrations is that the higher adsorption rates occur due to the saturation of the adsorption sites Active in the soil. Evaluating the results of the analysis of the soil remediation experiment contaminated with 2,4-D with heterogeneous Fenton treatment, no impact was observed on the availability of micronutrients, changes in soil acidity and microbiological community in the environment.