Evaluation of Residues of Chrysanthemum Ester Pesticides and Heavy Metals in Oolong Tea Samples / 环境与健康杂志

ABSTRACT

Objective To analyze the residues of chrysanthemum ester pesticides and heavy metals in several typical Oolong tea samples for evaluating the drink safety. Methods The residues of chrysanthemum ester pesticides in the tea samples were extracted with ultrasonic method. Gas chromatography equipped with ECD was applied to determine the pesticide residues. The heavy metals in tea samples were analyzed with an inductively coupled plasma-mass spectrometer (ICP-Mass) and an atomic fluorescence spectrometer. Results The residues of chrysanthemum ester pesticides in the dry tea samples were 0.200-0.780 mg/kg, no residues was detected in the tea water. The content of heavy metals in the dry tea and tea water was very low, under the standard limits. Conclusion The Oolong tea samples chosen in the present investigation have not been polluted by chrysanthemum ester pesticides and heavy metals, according to the results, the Oolong tea made in the area is safe for drink.