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目的:建立凉茶中15种有机氯农药残留的检测方法。方法:采用正己烷+丙酮(1+1)混合液提取凉茶中的农药残留,提取液过弗罗里硅土小柱净化,用正己烷+乙酸乙酯(9+1)混合溶液作洗脱液,8 ml即可将15种农药组分全部洗脱,方法简便快捷。结果:加标实验表明,15种农药的加标回收率在79.9%~107.3%之间,变异系数均小于8.7%,检出限在0.005~0.01μg/L之间。结论:采用该方法对市场上的几十种凉茶产品进行抽样检测,发现在小凉茶铺出售的凉茶产品中检出了农药成分。
Objective: To establish a method for the determination of 15 organochlorine pesticide residues in herbal tea. Methods: Pesticide residues in Herbal tea were extracted by n-hexane + acetone (1 + 1) mixture. The extract was purified by Florisil cartridge and eluted with n-hexane + ethyl acetate (9 + 1) Liquid, 8 ml can be 15 kinds of pesticide components all elution, the method is simple and quick. Results: The spiked experiments showed that the spiked recoveries of 15 pesticides ranged from 79.9% to 107.3%, the coefficients of variation were all less than 8.7%, and the detection limits were between 0.005 ~ 0.01 μg / L. Conclusion: This method is used to sample dozens of herbal tea products on the market. It is found that the pesticide ingredients were detected in herbal tea products sold in Xiao Liang Tea Shop.