Simultaneous determination of insecticide fipronil and its metabolites in maize and soil by gas chromatography with electron capture detection

Environmental Monitoring and Assessment
Tielong WangChaolun Liu

Abstract

An integrated method for the simultaneous determination of insecticide fipronil and its three metabolites, desulfinyl, sulfide, and sulfone, in maize grain, maize stem, and soil was developed. This three-step method uses liquid-solid extraction with ultrasound or mechanical grinding, followed by liquid-liquid partitioning and florisil solid-phase extraction (SPE) for cleanup. The quantification was conducted by gas chromatography-electron capture detection in triplicate for each sample. The method was validated with five replicates at three fortification concentrations, 0.002, 0.01, and 0.1 mg kg(-1), in each matrix and gave mean recoveries from 83 to 106 % with relative standard deviation ≤ 8.9 %. The limits of quantification (LOQ) were 0.002 mg kg(-1) for the compounds in all matrixes. In the field study in Beijing and Shandong 2012, fipronil-coated maize seeds were planted and the proposed method was applied for checking the possible existence of four compounds in maize and soil samples, but none of them contained residues higher than the LOQs in both application rates. Moreover, the dissipation of fipronil in soil fits first-order kinetics with half-lives 9.90 and 10.34 days in Beijing and Shandong, respectively. Combined w...Continue Reading

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Citations

Feb 13, 2016·Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences·Meiyu ZhangLimin He
Jun 1, 2015·Environmental Monitoring and Assessment·Mengmeng ZhongJiye Hu
May 19, 2018·Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment·Qiaozhen GuoBing Shao
Mar 12, 2020·Proceedings. Biological Sciences·Rieta GolsJoop J A van Loon
Nov 2, 2017·Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment·Lili RongYongquan Zheng
Sep 16, 2020·Analytical Methods : Advancing Methods and Applications·Rafaella TomaziniAntonio Aparecido Mozeto
Feb 11, 2015·Journal of Agricultural and Food Chemistry·Minghui LiLijun Han

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