Determination of Diafenthiuron and Its Metabolites in Tea and Soil by Ultra Performance Liquid Chromatography-Electrospray Ionization Tandem Mass Spectrometry

文献类型： 外文期刊

第一作者： Zhang Xin-Zhong

作者： Zhang Xin-Zhong;Luo Feng-Jian;Liu Guang-Ming;Lou Zheng-Yun;Chen Zong-Mao;Zhang Xin-Zhong;Zhang Xin-Zhong

作者机构：

关键词： Ultra performance liquid chromatography-electrospray ionization tandem mass spectrometry;Tea;Diafenthiuron and its metabolites

期刊名称：CHINESE JOURNAL OF ANALYTICAL CHEMISTRY （ 影响因子：1.134； 五年影响因子：0.909 ）

ISSN： 0253-3820

年卷期： 2011 年 39 卷 9 期

页码：

收录情况： SCI

摘要： A rapid and convenient UPLC-MS/MS method for analysis of diafenthiuron and its metabolites in tea and soil has been developed and validated. The sample was extracted with acetonitrile, added ammonium acetate and sodium chlorid, after centrifugation, the upper solvent was cleaned-up by N-propylethyl-diamine (PSA) and graphitizing of carbon black (GCB), then determined by UPLC-MS/MS coupled with Waters Acquity UPLC BEH C(18) column (100 mm X 2.1 mm X 1.7 mu m). Sample matrix-matched calibration was used to determine the residue contents by external standard. Over the concentration in the range of 2.0-4000 mu g/L (2.0-2000 mu g/L) for diafenthiuron ( diafenthiuronurea) in different matrix, the correlation coefficients (r) of the calibration curves were above 0.99, and the limits of detection (LODs) were 0.5 mu g/L (0.2 mu g/L) for each other. The recoveries of diafenthiuron and diafenthiuron-urea in fresh tea leaves, green tea, black tea and soil at three spiked concentration levels of 0.020, 0.200 and 4.00 mg/kg ranged from 70.8% to 110.5% with relative standard deviations (RSDs) between 0.8% and 1.4.4% (n=5), except for the recoveries of diafenthiuron in green tea at the lower level(56.3%, 64.1%). The limits of quantitation (LOQs) of diafenthiuron and diafenthiuron-urea were 0.005 mg/kg and 0.002 mg/kg, respectively. For validated, this method has been applied to the determination of diafenthiuron and its metabolites in field treatment experimental samples with a good result.

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