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Citation: WANG Jiao, QI Pei-Pei, LIU Zhen-Zhen, SUN Yu-Han, WANG Zhi-Wei, WANG Xiang-Yun, XU Hao, DI Shan-Shan, WANG Qiang, WANG Xin-Quan. High Throughput Analysis of Multiple Pesticides Residue in Soil Samples Using Magnetic Nanoparticles as Dispersive Adsorbent[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(2): 262-270. doi: 10.19756/j.issn.0253-3820.181447 shu

High Throughput Analysis of Multiple Pesticides Residue in Soil Samples Using Magnetic Nanoparticles as Dispersive Adsorbent

Institute of Quality and Standard of Agro-products, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China

Received Date: 6 July 2018
Revised Date: 25 November 2018

Fund Project: This work was supported by the Natural Science Foundation of China (No. 31501556) and the Special Fund for Agro-scientific Research in the Public Interest (No. 201503107).

A simple and rapid sample pretreatment method was developed based on magnetic nanoparticles for multi-pesticides residue analysis in soil samples. The target analytes were extracted by acetonitrile under the assistance of ultra-sonication, followed by the purification of dispersive solid phase extraction. The magnetite (Fe₃O₄) nanoparticles modified with 3-(N,N-diethylamino) propyltrimethoxysilane (Fe₃O₄-PSA) and commercial C₁₈ were selected as the cleanup adsorbents to remove the matrix interferences. The target analytes were further analyzed by ultra-high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS). The factors influencing the recoveries of analytes, such as extraction time, amount of Fe₃O₄-PSA and C₁₈, were optimized. The optimal extraction time was 10 min, and the amount of Fe₃O₄-PSA and C₁₈ were 40 mg and 30 mg, respectively. The method showed good linearity in the concentration range from 2 μg/L to 250 μg/L except for 3-hydroxy-carbofuran and isocarbophos (5 μg/L to 250 μg/L). The limits of detection (LODs) ranged from 0.1 μg/L to 1.0 μg/L. The recoveries ranged from 74.1% to 120.0% at three spiked concentration levels with relative standard deviations of lower than 18.1%. The proposed method was rapid, simple, low-cost and effective for detection of trace multi-pesticides residue in soil.
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