Detection of 30 kinds of pesticide residues from 10 different brands of green tea from Dongguan market

The paper took 10 different brands of green tea collected form Dongguan local supermarket as research objects, and researched the residue of 30 kinds of organophosphorus pesticides and pyrethroid pesticides.The samples were extracted by acetonitrile and cleared, then concentrated by rotary evaporators. The results revealed that, three pesticides were seriously excessive including chlorpyrifos, bifenthrin and cyhalothrin in 6 brands, and the other brands had small amount of pesticide residues.