Dried green tea leaves, fortified with more than 190 multi-class pesticides, were analyzed by the newly modified Luke multiresidue method. This consists of acetone-acetonitrile extraction, dichloromethane partition and florisil cartridge purification, eluting with n-hexane-dichloromethane-acetonitrile (50:45:5), which was optimized in this study. The final sample, in n-hexane, was analyzed by GC-ECD and/or NPD. Of the 194 pesticides tested, 147 pesticides were recovered with more than 70% from dried green tea leaves. Eighteen pesticides were not recovered at all with this method.
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