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《Fujian Analysis & Testing》 2012-03
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Study on Chlormequat and Mepiquat Residues and their dissipation trends in seeding water by Accelerated Solvent Extraction-Ultra-Performance Liquid Chromatography-Tandem Mass Spectrometry

Zhang Hong-xia1,Li Feng-ge1,2*,Li Xiao-yan2(1.Food Science Institute,Xinjiang Agriculture University,Urumqi,Xinjiang,830052,China; 2.Technical Center of Xinjiang Entry-Exit Inspection and Quarantine Burea,Urumqi Xinjiang,830063,China)  
A method for determination of chlormequat and mepiquat in seeding water by accelerated solvent extraction-Ultra-Performance Liquid Chromatography-Tandem Mass Spectrometry(ASE-UPLC-MS/MS) was established.The sample was cleaned up by WCX solid phase extraction column;The target compounds were separated on SeQuant ZLC-HILIC MEKCK.The residues of chlormequat and mepiquat were obtained under the electrospray ionization in positive ion mode(ESI+) and multiple reaction monitoring(MRM) mode;The matrix-matched external standards calibration curves were used for quantitative analysis,retain time and feature ion were used for qualitative determination.The linear range was 0.2~10μg/kg and the correlation coefficients(r2) was no less than 0.9990,The average recoveries of chlomequat and mepiquat from seeding water in the three spiked range of 2.0,5.0 and 10.0μg/kg were in the range of 89.1.0%~107.1% and 102.3%~105.4% respectively with relative standard deviations in the range of 8.5%~29.5% and 5.5%~23.0% respectively.The limits of detection and limits of quantitation for the target compounds were 0.2ng/mL and 0.001ng/mL respectively.With the established method,the dissipation rate of chlormequat and mepiquat in water was studied,showing that the target compounds will decrease to 96% or more at about 42days.
【Fund】: 国家质量监督检验检疫总局科研项目(No.2010IK127)
【CateGory Index】: S481.8;O657.63
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