Determination of 5 Pesticide Residues in Tea by Multi-plug Filtration Purification Cleanup Method Combined with Ultra Performance Liquid Chromatography-tandem Mass Spectrometry
A method was established for simultaneous determination of thiamethoxam,fenpyroximate,propargite,buprofezin and abamectin residues in tea,which was based on multi-plug filtration cleanup(m-PFC)column combined with Ultra Performance Liquid Chromatography-tandem Mass Spectrome-try(UPLC-MS/MS).The samples were firstly extracted with acetic acid acetonitrile after being fully wetted with water.QuEChERS salt packs were added to the system to separate into organic and aque-ous phases,then the upper fraction was purified on a m-PFC column.The target drug residues were lastly quantified by the matrix-matched external standard method using UPLC-MS/MS in the multiple reaction monitoring(MRM)mode with positive electrospray ionization(ESI+).The results showed 5 pesticide residues had good linearity in the range of 1.00～100.00 μg·L-1 with correlation coefficient(r)above 0.999.The detection limits were in the range of 1.2～2.2 μg·kg-1,and the quantitation lim-its were 5.0 μg·kg-1.At the addition level of 5.00～250 μg·kg-1,the recoveries ranged from 71.5％to 109.9％,with relative standard deviations(RSDs)of 2.6％～8.4％(n=3).
万方数据
维普
