O presente trabalho tem como objetivo avaliar o potencial de contaminação de águas superficiais e subterrâneas por atividades de agricultura irrigada do Baixo Jaguaribe, Ceará. A análise foi realizada mediante critérios da Environmental Protection Agency (EPA), índice de GUS e método de GOSS. Esses critérios baseiam-se em propriedades físico-químicas dos princípios ativos de cada agrotóxico. Neste estudo, foram avaliados os principais produtos aplicados nas culturas irrigadas no Baixo Jaguaribe, através de levantamento realizado na própria região. Por meio da comparação entre os modelos, alguns pesticidas apresentaram potencial de contaminação em águas superficiais e subterrâneas, sendo necessário o monitoramento constante dos níveis desses resíduos.
"Quick, Easy, Cheap, Effective, Rugged and Safe" (QuEChERS)-GC/MS analytical technique was used to evaluated matrix effect of twenty-two pesticides in guava. Validation parameters (selectivity, linearity, LOD, LOQ, accuracy and precision) were determined for multiresidue analysis. Statistical test (t-student) was applied to the coefficients of the curves obtained for the guava matrix. The matrix effect (ME) for each pesticide was evaluated through the study of slope ratios obtained of solvent and guava matrix curves. Most of the compounds had positive ME. The rates of recovery were satisfactory (73.97-119.38%), with a coefficient of variation (CV) less than 20%. Analysis of commercial guava samples showed the presence of 5 types of pesticides residues at levels ranging from 0.1 to 0.5 mg·kg(-1). The results reveal the presence of unauthorized pesticides for cultivation of guava. This data can assist government agencies to ensure food security.
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