| Abstract
| - Stir bar sorptive extraction (SBSE) in combination with GC-ECD/FPD analysis is here applied to thedetermination of the residues of 11 pesticides (hexachlorobenzene, lindane, chlorothalonil, parathionmethyl, parathion ethyl, fenitrothion, malathion, dieldrin, α- and β-endosulfan, and tetradifon) in herbalteas prepared with Passiflora alata Dryander spiked leaves. The method was optimized using spikedherbal teas in a range from 0.05 to 1 pg/μL for organochlorine pesticides and from 0.15 to 3 pg/μLfor organophosphorus pesticides. The method is reproducible and repeatable with recoveriescalculated from herbal teas prepared with spiked plant material versus spiked herbal teas, varyingfrom about 30% for tetradifon to about 90% for parathion methyl and malathion. The limits ofquantitation (LOQs) ranged from 0.017 pg/μL for lindane to 0.117 pg/μL for malathion. Keywords: Stir bar sorptive extraction (SBSE); sample preparation; medicinal plants; Passiflora alataDryander; herbal teas; pesticide residues
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