QuEChERS法动态监测及评价山西省韭菜中12种农药残留

采用乙腈超声提取,经PSA、C_(18)基质分散净化,通过液质联用及气质联用建立了韭菜中吡虫啉、敌敌畏、毒死蜱、多菌灵、腐霉利、甲胺磷、甲氰菊酯、克百威、六六六、氯丹、(高效)氯氟氰菊酯、阿维菌素等12种农药的Qu ECh ERS(quick,easy,cheap,effective,rugged,safe)快速检测方法,并对山西省市售韭菜的农药残留状况进行了动态监测和评价。结果表明:山西省韭菜中农药残留的总检出率为80%,超标率为20%,使用比较多的农药为吡虫啉、敌敌畏、多菌灵、腐霉利、甲氰菊酯和(高效)氯氟氰菊酯,腐霉利超标是韭菜产品不合格的主要因素。8月后太原及周边地区韭菜中的农药残留水平较高,且该地区农贸市场与超市韭菜中农药残留的检出率相近,但前者超标率(27.3%)明显高于后者(9.1%)。

Dynamic Monitoring and Evaluation of 12 Pesticide Residues in Leek from Shanxi Province by QuEChERS Method

The QuEChERS method for rapid detection of 12 pesticide residues in leek was established in combination with LC/GC-MS-MS，taking acetonitrile as solvent for ultrasonic extraction and PSA and C₁₈ as adsorbent for solid extraction. The involved 12 pesticides were imidacloprid，dichlorvos，chlorpyrifos， carbendazim，procymidone，methamidophos，fenpropathrin，carbofuran，benzex，chlordan，cyhalothrin and abamectin. Then the pesticide residues status in leek of Shanxi Province was dynamically monitored and analyzed. The results showed that the total detection rate of pesticide residues in leek was 80%，and the over standard rate was 20%. Frequently used pesticides were imidacloprid，dichlorvos，carbendazim，procymidone，fenpropathrin and cyhalothrin. For the unqualified samples，the higher residues of procymidone was the main reason. The level of pesticide residues of Taiyuan City and its surrounding areas was higher since August. Meanwhile，the detection rate of pesticide residues in leek from the nearby farmers markets was close to that from supermarkets. However， the over standard rate of the former（27.3%）was evidently higher than that of the latter（9.1%）.