MULTI-RESIDUE METHOD OF NINE FUNGICIDES IN FRUITS AND VEGETABLES EMPLOYING DISPERSIVE SOLID-PHASE EXTRACTION AND HPLC/MS DETECTION

A multi-residue analysis method for nine fungicides in fruits and vegetables was developed.
Samples were extracted with acetonitrile in the presence of anhydrous MgSO₄ and NaCl; and then cleaned up by reversed dispersive solid-phase extraction (dispersive-SPE) with primary secondary amine (PSA) as main sorbent, with MgSO₄ and activated carbon for auxiliary reagents.
A monolithic column was compared with the packed column in LC separation.
The linear range was from 0.02 to 5 mg L^-1 and regression coefficients were >0.995 with relative standard deviations relative standard deviations (R.S.Ds) less than 2%. Six kinds of extracts from apple, pear, grape, tomato, cucumber and lettuce were selected as typical categories and spiked at 0.02, 0.1, 1 mg kg^-1 levels.
Recoveries of the nine fungicides were between 74% and 110%. LOQs of these pesticides can meet the requirements of MRL compliance check.

International Symposium on Vegetable Safety and Human Health

Jinfang Wang, Haifeng Chen, Canping Pan, Jingping Zhang, Weimin Niu

fungicides, residue analysis, monolithic column, HPLC-ESI-MS

https://doi.org/10.17660/ActaHortic.2010.856.27