数字农科院2.0

Residue Determination of Epoxiconazole, Indoxacarb and Difenoconazole in Tea, Tea Infusion and Soil using Ultra High Performance Liquid Chromatography Coupled with Tandem Mass Spectrometry

文献类型： 外文期刊

作者： Zhang Xin-Zhong;Luo Feng-Jian;Chen Zong-Mao;Liu Guang-Ming;Lou Zheng-Yun;Wang Fang;Wu Lu-Chao;Zhang Xin-Zhong;Luo Feng-Jian;Chen Zong-Mao;Liu Guang-Ming;Lou Zheng-Yun;Zhang Xin-Zhong;Luo Feng-Jian;Chen Zong-Mao;Liu Guang-Ming;Lou Zheng-Yun

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关键词： Ultra high performance liquid chromatography coupled with tandem mass spectrometry;Pesticide residue analysis;Tea;Tea infusion;Soil;Epoxoconazole;Indoxacarb;Difenoconazole

期刊名称： CHINESE JOURNAL OF ANALYTICAL CHEMISTRY

ISSN： 0253-3820

年卷期： 2013 年 41 卷 2 期

页码：

收录情况： SCI

摘要： To meet the need of simultaneous residue determination for epoxiconazole, indoxacarb and difenoconazole in tea, tea infusion and soil, a sensitive and convenient method was developed by validated using ultra-high performance liquid chromatography coupled with tandem mass spectrometry (UPLC-MS/MS). Target compounds were extracted by acetonitrile followed by Florisil and graphit carbon black (GCB) mix-column cleanup for tea and soil, and target compounds in tea infusion was extracted and cleanuped by BondElut C-18-SPE column. The fragmentation pathway and matrix effect were investigated. Over the concentration in the range of 0.005-4.0 mg/L for epoxiconazole, indoxacarb and difenoconazole, the correlation coefficients (r) of the calibration curves were above 0.9997, and the limits of detection (LODs) were lower than 0.002 mg/L. The average recoveries of epoxiconazole, indoxacarb and difenoconazole in different matrix (green tea, black tea, puerh tea, black tea infusion, fresh tea leave and soil) at three spiked concentration levels ranged from 66.3% to 111.5% with relative standard deviations (RSDs) between 0.9% and 17.6% (n=5). The limits of quantitation (LOQs) of three pesticides were lower than 0.005 mg/kg in made tea, 0.002 mg/kg in fresh tea leave and soil, 0.10 mu g/L in black tea infusion. The proposed method was successfully applied to the routine export green tea and black tea sample (n=40) in China, there were 0.014 mg/kg residue of indoxacarb in one sample, 0.012 mg/kg-0.040 mg/kg residue of difenoconazole in four sample, and no epoxiconazole detected, all of tea sample were meet the MRL requirements of EU and Japan. Also, this method was successfully used to the study on the degradation loss rate of indoxacarb during the processing of fresh tea leaves to made tea, and on the leaching rate of indoxacarb during the brewing process from made tea to tea infusion, the average results were the processing degradation loss rate of indoxacarb at 24.8%, and the total leaching rate of indoxacarb at 5.2% (n=3).

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