Determinação de resíduos de pesticidas em plasma bovino por cromatografia gasosa-espectrometria de massas

Abstract

Recebido em 25/5/08; aceito em 18/3/09; publicado na web em 4/8/09 PESTICIDES RESIDUE DETERMINATION IN CATTLE PLASMA BY GAS CHROMATOGRAPHY-MASS SPECTROMETRY. An analytical method for the isolation based on matrix solid-phase dispersion technique and gas chromatographic determination of pesticides in cattle plasma is presented. It was fortified 0.25 g of plasma with pesticides and blended with 1 g each C18 and Na 2 SO 4. The homogenized matter was transferred to a SPE cartridge, which contained 1 g of activated florisil with 5 mL acetonitrile. The analites were eluted under vaccum with 15 mL acetonitrile, the extract was analyzed by gas chromatography-mass spectrometry. The limit of quantification of the method was 0.04 mg L-1 for chlorphenvinfos and fipronil and 0.02 mg L-1 for cypermethrin..