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A rapid, specific, and sensitive multiresidue method to determine 67 pesticides in made tea, tea infusion, and spent leaves was developed and validated for routine analysis by GC/MS with an approximately 29 min GC run time. The method was reproducible (HorRat &amp;lt;0.5 at 50 ng/g) when validated at 50 and 100 ng/g. The samples were extracted with ethyl acetatecyclohexane (9 + 1, v/v), and the extracts were cleaned up by dispersive SPE with primary-secondary amine sorbent + graphitized carbon black + Florisil. The recoveries of all the pesticides were within 70120 with an RSD of &amp;lt;20 at 50 ng/g and R2 &amp;gt; 0.99. The matrix effect on the signals of the compounds was corrected by using matrix-matched calibration standards. The LOQ met the requirements of the maximum residue limits for pesticides in tea as recommended by the European Union.

journal of aoac international

Validation and Uncertainty Analysis of a Multiresidue Method for 67 Pesticides in Made Tea, Tea Infusion, and Spent Leaves Using Ethyl Acetate Extraction and Gas Chromatography/Mass Spectrometry