An Improved Method for Multiresidue Analysis of Pesticides in Lettuce, Chinese Cabbage and Green Pepper by Gas Chromatography
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Abstract
For the improvement of gas chromatographic analysis of multiple pesticide residues in green pepper, lettuce and Chinese cabbage, multiresidue test mixtures (MRTMs) of 10 groups (ECD 5 groups and NPD 5 groups) and a recovery test mixture (RTM) of 18 compounds (11 compounds for ECD and 7 compounds for NPD) were established based on retention time and response to relevant detectors. A new extraction solvent (acetone : acetonitrile=1 : 9) and a clean up eluent (hexane : dichloromethane : acetonitile = 50 : 48.5 : 1.5) for solid-phase extraction (SPE) cartridge were selected to test two types of multiresidue methods (MRM I and MRM II). MRM II provided high recovery better than MRM I when RTM was tested. Recovery experiment with MRTMs which was conducted using MRM II resulted in that more than seventy percents of compounds were recovered in the range of 50~140%, while 9% of compounds were over 140% of recovery and only 7~8 compounds failed to detect. MRM II, an improved method, could be employed for screening residues of 190 pesticides in those vegetables.
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