AVALIAÇÃO DO NÍVEL RESIDUAL TEÓRICO E EXPERIMENTAL DE ENDOSULFAN EM ÓLEO DE SOJA (Glycine max. (L) Merrill)
Visou-se quantificar teórica e experimentalmente os níveis residuais de Endosulfan e seus principais metabólitos em óleo de soja e avaliar a confiabilidade dos valores teóricos em relação ao experimental. A soja foi cultivada no campo nos sistemas manejo integrado de pragas (MIP) e convencional. Extraiu-se o óleo de soja utilizando o solvente hexano em extrator Soxhlet. Determinaram-se as concentrações do Endosulfan no grão e no óleo, mediante cromatografia em fase gasosa, com detector de captura de elétrons (Ni63). A concentração de Endosulfan no óleo foi obtida teoricamente multiplicando-se a relação entre a massa grão/óleo pela concentração deste inseticida encontrada experimentalmente no grão. A relação percentual da concentração de Endosulfan no óleo, entre os valores teórico/experimental, enquadraram-se na faixa de 94% a 114% e 81% a 92%, respectivamente, para os sistemas MIP e convencional. Como a média geral dos níveis de Endosulfan, calculada teoricamente, alcançou 94% do valor obtido experimentalmente concluiu-se que o cálculo teórico pode ser utilizado para determinar os níveis deste inseticida no óleo de soja. EVALUATION OF THE THEORETICAL AND EXPERIMENTAL RESIDUAL LEVELS OF ENDOSULFAN IN SOYBEAN (Glycine max. (L) Merrill ) OIL Abstract The objective of this study was to quantify theoretically and experimentally the residual levels of Endosulfan and main metabolites in soybean oil and to evaluate the reliability of the theoretical values in relation to the experimental values. The soybean was grown in the fields in the pest integrated management (PIM) and conventional systems. The soybean oil was extracted by using hexane as solvent in Soxhlet extractor. The Endosulfan concentrations were determined in the grains and oil by means of gas chromatography equipped with electron capture detector (Ni63). The Endosulfan concentration in soybean oil was theoretically obtained by multiplying the relationship between the grain mass/ soybean oil by this insecticide concentration determined experimentally in the grain. The percents relationship of the concentration of Endosulfan in the soybean oil between the theoretical/experimental values were in the range of 94% to 119% and 81% to 92%, respectively, for the PIM and conventional system. As the general average levels of Endosulfan, theoretically calculated, reached 94% of the value obtained experimentally it was concluded that the theoretical calculation could be used for determination this insecticide levels in the soybean oil.