An absorbing microwave micro-solid-phase extraction device used in non-polar solvent microwave-assisted extraction for the determination of organophosphorus pesticides |
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Authors: | Ziming Wang Xin Zhao Xu Xu Lijie Wu Rui Su Yajing Zhao Chengfei Jiang Hanqi Zhang Qiang Ma Chunmei Lu Deming Dong |
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Institution: | 1. College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China;2. College of Environment and Resources, Jilin University, 2699 Qianjin Street, Changchun 130012, China;3. Chinese Academy of Inspection and Quarantine, Beijing 100123, China;4. College of Technology Center, Jilin Entry-Exit Inspection and Quarantine Bureau, Changchun 130062, China |
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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%. |
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Keywords: | Absorbing microwave micro-solid-phase extraction device Microwave-assisted extraction Non-polar solvent Organophosphorus pesticides |
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