Monitoramento de agrotóxicos no estado do MT : indicadores de contaminação partir da retenção em filtros domésticos de água tratada

Abstract

The intense use of pesticides in Mato Grosso's agriculture is notorious, and many of these products are toxic to the environment and living beings. The retention/sorption efficiency of these substances in domestic water filters is an important parameter from a public health point of view, since possible contamination in drinking water samples could be remedied. This work aims to evaluate the retention capacity of pesticides, carbofuran, carbosulfan, methomyl, tebuconazole, diuron and imidacloprid present in aqueous samples (drinking water) in domestic water filters and comparative tests with an activated carbon matrix. the concentration of analytes using ultrasound extraction, using organic solvents, and quantification by high performance liquid chromatography with a diode array, being carried out the previous step of validation of the analytical method. For the data obtained with PA activated carbon samples, the most promising results were found for the solvents Acetonitrile and the Methanol: Ethyl acetate mixture (70:30 v/v), combined with 4 cycles of extraction in an ultrasonic bath. 15 min each, for the effective extraction of all pesticides studied, with the exception of tebuconazole, due to obtaining an analytical curve with an inadequate correlation coefficient (r) for this analyte, according to ANVISA criteria. The values found for the percentages (%) of pesticide extraction in PA activated carbon will be adopted as a reference and compared with those obtained by the coals of domestic water filters, a step that cannot be performed in this work due to the COVID -19 pandemic.