采用高分辨气相色谱/高分辨质谱(HRGC/HRMS)定量测定了底泥中的17种2,3,7,8位多氯代二(噁)英和呋喃(PCDD/Fs),并测定了四至八氯取代的二(噁)英和呋喃总量.样品经加速溶剂萃取,然后通过流体控制系统(FMS)自动过硅胶柱、氧化铝柱和碳柱净化,最后浓缩.以HRGC/HRMS电压选择离子检测模式对样品中的PCDD/Fs进行了定性分析,采用同位素稀释技术定量,该方法可精确定量到pg/g水平.结果表明该方法分析的17种二(噁)英和呋喃异构体的检出限可达0.1 pg/g.同位素标准的回收率为49.8% ~85.3% ,样品中各异构体的回收率为93.2% ~115.6% .该方法不但满足国际标准的要求,还大大提高了分析速度,使分析周期从原来的2周缩短到2 d以内.
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