8. Dry column 30 s under vacuum on the SPE station.
9. Dry column under nitrogen steam on the SPE station with drying option (approx 30 min)
at room temperature.
10. Rinse column with 2 mL n-hexane (see Note 6).
11. Elute pyrethroids with 3 mL hexane:dichloromethane 1:1 (v/v).