Ozônio na degradação de resíduos de inseticidas em grãos de milho

• Autor(a) principal: Freitas, Romenique da Silva de
• Data de Publicação: 2013
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/747
• topic: Bifentrina; Pirimifós-metílico; Resíduos; Grãos; Bifenthrin; Pirimiphos-methyl; Residues; Grains; CNPQ::CIENCIAS AGRARIAS::ENGENHARIA AGRICOLA

The insecticide residues in foods is a serious health risks to the population. It s necessary to adopt strategies for the degradation of pesticides residues in the grains and by-products before consumption. A potential strategy is the use of ozone, wich has been used for the removal of pesticide residues in different matrices. This study aimed to evaluate the ozone effectiveness in the bifenthrin and pirimiphos-methyl degradation in maize grains. The study was divided into two phases. In the first phase was optimized and validated the technique of solid-liquid extraction with low temperature partitioning (SLE-LTP) for bifenthrin and pirimiphos-methyl in maize grains. In the second phase was studied the kinetics of the degradation of insecticide residues according to the ozone exposure. Associated to this, was evaluated the ozonation effect on the maize quality. The results indicated that the developed ESL-PBT according to the guidelines established by ANVISA and INMETRO and can be used for the bifenthrin and pirimiphos-methyl determination in maize samples. It was observed that ozone was effective in the bifenthrin and pirimiphos-methyl degradation. The increase of insecticide degradation was directly proportional to the increase in the ozone exposure. This process was adjusted to a first order kinetic model with half-lives for bifenthrin and the pirimiphos-methyl equal to 4.1 and 0.2 h, respectively. It was found that the process of ozone application did not alter qualitative characteristics evaluated. Thus, it becomes evident the use of ozone as a potential strategy for the removal of pesticide residues in stored grains and by-products.