Abstract: Microwave absorption medium tube(MAMT) was firstly used to heat sample system, a new microwave-assisted extraction method was proposed and used for extracting four organophosphorus pesticides in fruit samples. In addition, a new portable microwave extraction apparatus(PMEA) was assembled in the laboratory and applied in this study. Because no polar solvent was used, the extract obtained by non-polar solvent(hexane) could be analysed directly by GC-MS without any clean-up step. The MAMT was made by sealing graphite powders in glass tube, which can be reused. The PMEA could be used in field environmental samples pretreatment. Some experimental parameters, such as type of extraction solvent, solid-to-liquid ratio, extraction temperature, and extraction time, were investigated. Four organophosphorus pesticides could be extracted from fruit samples within 8 min, and the recoveries obtained were 79.4%-107.6% with RSD <12.20%(n=3). The limits of detection for the analytes were found to be 0.15-0.42 μg/kg. The results indicated that the proposed method was simple, efficient and feasible.

Key words: Microwave absorption medium tube, Portable microwave extraction apparatus, Non-polar solvent, Organophosphorus pesticide