Title: Determination of Fosthiazate Residues in Cucumber,Tomato and Soil Using UPLC-MS/MS
Abstract: In order to build a rapid and sensitive analytical method for determination of fosthiazate residues in cucumber,tomato and soil,the determination conditions of fosthiazate residues by the method of UPLC-MS/MS were studied.Results:the samples were extracted by acetonitrile and then purified by primary secondary amine(PSA)and graphitized carbon(GCB).The mass spectrometer was operated with electrospray in the positive ion mode(ESI+).The fosthiazate was quantified by external standard method and matched standard solution used to compensate for matrix effect.The qualitative results were obtained on retention time,the precursor ion and two daughter ions,and the qualitation results were on the intension of the characteristic m/z 284.3/228ion and m/z 284.3/104ion.Average recoveries of fosthiazate in cucumber,tomato and soil at four levels(0.002mg/kg,0.02mg/kg,0.2mg/kg and 2mg/kg)ranged from 86.0%to 101.9% with relative standard deviations from 1.7%to 9.4%(n=5).Limits of detections of fosthiazate in cucumber,tomato and soil were 0.042~0.049μg/kg,while limits of quantifications were 0.141~0.164μg/kg,respectively.The method is simple,rapid and accurate,and it can meet the requirements of the domestic and international legislation.The method adapts to confirm residues of thifluzamide in rice,corn and potato.
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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