title: An absorbing microwave micro-solid-phase extraction device used in non-polar solvent microwave-assisted extraction for the determination of organophosphorus pesticides.
abstract: A single-step extraction-cleanup method, including microwave-assisted extraction (MAE) and micro-solid-phase extraction (μ-SPE), was developed for the extraction of ten organophosphorus pesticides in vegetable and fruit samples. Without adding any polar solvent, only one kind of non-polar solvent (hexane) was used as extraction solvent in the whole extraction step. Absorbing microwave μ-SPE device, was prepared by packing activated carbon with microporous polypropylene membrane envelope, and used as not only the sorbent in μ-SPE, but also the microwave absorption medium. Some experimental parameters effecting on extraction efficiency was investigated and optimized. 1.0 g of sample, 8 mL of hexane and three absorbing microwave μ-SPE devices were added in the microwave extraction vessel, the extraction was carried out under 400 W irradiation power at 60°C for 10 min. The extracts obtained by MAE-μ-SPE were directly analyzed by GC-MS without any clean-up process. The recoveries were in the range of 93.5-104.6%, and the relative standard deviations were lower than 8.7%.
authors.affiliation: College of Chemistry, Jilin University, Changchun 130012, China. wangziming@jlu.edu.cn
authors.forename: Ziming
authors.initials: Z
authors.lastname: Wang
authors.forename: Xin
authors.initials: X
authors.lastname: Zhao
authors.forename: Xu
authors.initials: X
authors.lastname: Xu
authors.forename: Lijie
authors.initials: L
authors.lastname: Wu
authors.forename: Rui
authors.initials: R
authors.lastname: Su
authors.forename: Yajing
authors.initials: Y
authors.lastname: Zhao
authors.forename: Chengfei
authors.initials: C
authors.lastname: Jiang
authors.forename: Hanqi
authors.initials: H
authors.lastname: Zhang
authors.forename: Qiang
authors.initials: Q
authors.lastname: Ma
authors.forename: Chunmei
authors.initials: C
authors.lastname: Lu
authors.forename: Deming
authors.initials: D
authors.lastname: Dong