Monitoramento da atividade microbiana e ensaios ecotoxicológicos com o pesticida amicarbazone em solo agrícola

Abstract

Bioremediation is a process used in the treatment of areas contaminated by chemical compounds, in which microorganisms are used for the biodegradation of these substances, promoting the decontamination of certain environments. Pesticides are currently used to maintain large productions, but they negatively impact the environment, with the residues that are deposited in the soil. The main objective of the work was to verify the effectiveness of the microbial community in biodegrading and detoxifying a soil contaminated by the herbicide amicarbazone, which is widely used in sugarcane crops. For this, the Bartha and Pramer respirometry method was used to quantify CO2 generated from microbial activity over 60 days, with three different tools being evaluated (20 mg/L, 200 mg/L and 2000 mg/L) make herbicide. Subsequently, a kinetic mathematical modeling was performed to analyze the results, identifying that the test containing 200 mg/L would produce a maximum of 712.96 mg of accumulated CO2. After the biodegradation process, an ecotoxicity test was performed on Lactuca sativa seeds, there was no decrease in the toxicity of the herbicide in the 200 and 2000 mg/L installations, and it was possible to observe a greater growth of the seedling roots, such as which were previously heavily affected by the herbicide. The results obtained encourage future research on the analysis of the behavior of amicarbazone with the environment.