将磁性石墨烯作为磁性固相萃取的吸附剂与气相色谱-质谱(GC-MS)相结合建立了环境水样中7种三嗪类除草剂残留的测定新方法.对影响萃取效率的一些因素如吸附剂用量、萃取时间、样品溶液的pH值、离子强度和解吸条件等进行了优化.在优化的实验条件下,7种三嗪类除草剂的富集倍数在574 ~ 968之间.测定西玛津、扑灭津、嗪草酮、西草净、氰草津的线性范围为0.01 ~10.0μg/L,莠去津的线性范围为0.05~10.0 μg/L,扑灭净的线性范围为0.01 ~8.0 μg/L.线性相关系数为0.996 8 ~0.999 8,检出限(S/N=3)为1.0~5.0ng/L.将本方法应用于井水、自来水和湖水等实际水样的分析,在0.5 μg/L和2.0μg/L下的加标回收率为79.8% ~118.3%,相对标准偏差为3.6% ~ 10.5%.该法操作简单、富集倍数高,可满足水样中三嗪类除草剂残留的检测要求.
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