基于搅拌棒吸附萃取技术检测有机磷农药残留的前处理条件优化

s a new sample pre-treatment technique, the extraction and analysis of stir bar sorptive extraction (SBSE) technology is affected by multiple factors. In the solvent analysis model, combined with liquid chromatography tandem mass spectrometry technology, the effect factors on organophsphorus pesticides residues adsorption extraction efficiency, such as extraction coating, extraction temperature, extraction mode, pH value, stirring speed, extraction time, ionic strength and the influence on parsing efficiency such as analytical solution, analytical time, analytical model were optimized. The results show that, in order to achieve the best extraction and analysis results, polydimethylsiloxane (PDMS) coating, dynamic model, 150rpm oscillation speed, 30min extraction time and the concentration of 5%NaCl is the best choice; with methanol as the analytical solution, 6min as the analytical time and analysis in dynamic model can get a satisfactory result.