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建立了测定室内灰尘样品中39种多氯联苯(PCBs)的分析方法.样品经吸尘器采集、正己烷-二氯甲烷(1∶1,v/v)超声萃取、浓缩后,利用气相色谱-三重四极杆质谱法(GC-MS/MS)在选择反应监测(SRM)模式下测定.结果表明,39种PCBs在30 min内得到了很好的分离,在0.1 ~ 100 μg/L范围内线性关系良好,相关系数为0.991 0~0.999 9,方法的加标回收率为57.2% ~120.3%,日内测定的相对标准偏差(RSD)为0.3% ~ 24.7%,日间测定的RSD为0.6% ~ 29.9%,检出限(信噪比为3)为0.000 3 ~0.208 0 ng/g.本方法灵敏度高、准确度和精密度好,简便快速,溶剂消耗量少,适用于灰尘中多种多氯联苯的同时测定.

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