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目的研究不同干燥方法对菊花中氧乐果、敌敌畏、甲基对硫磷、甲拌磷、内吸磷、对硫磷6种有机磷农药残留量的影响。方法将污染农药的鲜菊花分别进行蒸3 min阴干、50℃烘干、阴干和晾干处理,采用乙腈提取有机磷农药并经Carb/PSA双层固相萃取柱净化,通过气相色谱仪(配FPD检测器)测定有机磷农药残留量。结果 6种有机磷农药在0.01~0.08μg/m L浓度范围内线性良好,相关系数r>0.997,回收率在78.5%~94.3%之间,相对标准偏差RSD为1.7%~5.9%,检出限为0.53~1.16μg/kg。3种干燥的菊花中均未检测到6种有机磷农药。结论蒸3 min阴干、50℃烘干和阴干3种干燥方法均显著降低菊花有机磷农药残留量。
Objective To study the effects of different drying methods on the residues of six kinds of organophosphorus pesticides in the chrysanthemums such as Omethoate, Dichlorvos, Methyl parathion, Phorate, Phosphorus and Parathion. Methods Fresh chrysanthemums contaminated with pesticides were dried for 3 min, dried at 50 ℃, dried in air and dried. The organophosphorus pesticides were extracted by acetonitrile and purified by a Carb / PSA double-phase solid phase extraction column. FPD detector) Determination of organophosphorus pesticide residues. Results Six kinds of organophosphorus pesticides showed a good linearity in the range of 0.01-0.08 μg / mL with the correlation coefficient r> 0.997, the recoveries ranged from 78.5% to 94.3%, and the relative standard deviations (RSDs) ranged from 1.7% to 5.9% The limit is 0.53 ~ 1.16μg / kg. Six kinds of organophosphorus pesticides were not detected in the three kinds of dried chrysanthemum. Conclusion Three drying methods of drying at 50 ℃ for 3 min, drying at 50 ℃ and drying in the oven significantly reduced the residual organophosphorus pesticide residues in chrysanthemum.