采用加速溶剂萃取结合超高效液相色谱-串联质谱(UPLC-MS/MS)技术,建立了一种快速提取和测定棉花中8种脱叶剂(噻苯隆、脱叶磷、甲基苯噻隆、脱落酸、氟酮唑草酯、敌草隆、百草枯、嘧草硫醚)的分析方法.样品经提取、浓缩,乙腈-水溶液(1∶9,v/v)溶解,采用Acquity UPLC(R) HSS T3柱(50 mm×2.1 mm,1.8μm)分离,以乙腈-0.05％ (v/v)甲酸水溶液为流动相,梯度洗脱,电喷雾正离子模式多反应监测,外标法定量.该方法在0.01 ～0.3mg/L范围内线性关系良好(r＞0.99),在添加含量水平为0.l、0.5、1.0 mg/kg时,平均回收率范围为(84.18±8.04)％～(95.99±6.76)％,相对标准偏差(RSD)为7.04％ ～10.60％,方法检出限(LOD)为0.8～29 μg/kg,方法定量限(LOQ)为2.5～96 μg/kg.该方法操作简便、快捷、灵敏、准确,适合棉花中8种脱叶剂的确证和定量测定.
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