Determination of Eight Pesticide Residues in Tea by QuEChERS Pretreatment Method
The QuEChERS method was used to determine eight pesticide residues in tea.The residues of omethoate,imidacloprid,diniprid,Metocarb,carboxanil,3-hydroxycarboxanil,isoprocarb and chlorobenzamide in tea samples were extracted by acetonitrile.Organic acids,pigments and other impurities were adsorbed by QuEChERS dispersive solid phase extraction column,then determined by UPLC-MS/MS method after centrifugation and filtration,and quantified by external standard matrix method.The optimum conditions for extraction and purification were studied.
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