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目的以石墨烯为吸附剂,建立分散固相萃取-液相色谱-串联质谱法测定茶叶中多种氨基甲酸酯类农药残留量。方法样品采用水浸泡、乙腈提取,石墨烯作为吸附剂祛除杂质后,液相色谱-串联质谱仪测定,外标法定量。结果 15种氨基甲酸酯类农药在0.001~0.02μg/mL范围内线性良好,相关系数均大于0.990,且定量限均可达到0.01 mg/kg。空白样品在0.01、0.02和0.10 mg/kg 3个添加水平下,回收率范围为61%~106%,相对标准偏差为4.6%~13%。结论本方法操作简便、快速、成本较低,适用于茶叶中氨基甲酸酯类农药的检测。
OBJECTIVE To establish a dispersive solid-phase extraction-liquid chromatography-tandem mass spectrometry (GPC-MS) method for the determination of various carbamate pesticide residues in tea with graphene as adsorbent. Methods The samples were immersed in water, extracted with acetonitrile and graphene as adsorbents to get rid of impurities. The samples were determined by liquid chromatography-tandem mass spectrometry and quantified by external standard method. Results The linearities of the 15 carbamate pesticides in the range of 0.001-0.02 μg / mL were good with the correlation coefficients greater than 0.990 and the limits of quantitation up to 0.01 mg / kg. The recoveries ranged from 61% -106% with relative standard deviations of 4.6% ~ 13% at the three spiked levels of 0.01, 0.02 and 0.10 mg / kg. Conclusion The method is simple, rapid, and low cost and suitable for the detection of carbamate pesticides in tea.