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评价了分析过程中不同条件下使用分散固相萃取( D-SPE)材料净化对农残分析定量结果可靠性的影响,表明通过条件优化,可明显减小定量误差,并取得满意的回收率.建立了蔬菜中112种农药的多反应监测-气相色谱-串联质谱(GC-MS/MS)检测方法.在pH 5 ~7范围内,样品经乙腈-甲苯(8∶1,v/v)匀浆提取,每5 mL提取液加入0.8g无水硫酸镁、0.05g石墨化炭黑(GCB)、0.1g乙二胺-N-丙基甲硅烷(PSA)、0.05gC18粉末,分散固相萃取法净化,采用气相色谱-三重串联四极杆质谱( GC-QQQ-MS/MS)在多反应监测模式(MRM)下进行测定,内标法定量.分别对韭菜、黄瓜、紫甘蓝进行3个水平的加标回收试验(20、50、200μg/kg),其回收率范围为53.1%~138.7%,其中86种农药的3个加标水平的回收率范围均为65.0%~ 120.0%,方法的相对标准偏差(RSD)小于12%,方法的定量限(LOQ)范围为1.6~13.4 μg/kg.对从市场采集的蔬菜样品进行了测定,检出了三唑磷、甲氰菊酯等农药残留.该方法样品前处理简单快速,灵敏度、准确度和精密度均符合农药多残留检测技术的要求,适用于蔬菜中112种农药残留的快速筛查测定.

参考文献

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