中文摘要：

通过指示物间接实现二恶英在线检测是一种可行的检测方法，氯苯是较合适的指示物。本文采用真空紫外光电离／飞行时间质谱仪进行定浓度-氯苯（MCBz）和1．2-二氯苯（DCBz）为二恶英指示物在线测量，两种物质的检测信号峰具有很好的辨别度，峰值都在6以上，检测信号强度与实际浓度之间用常用对数（1g）拟合关系最为理想。MCBz和DCBz的信号集中在4—12min内，其信号基本符合正态分布的形式。离线测量与在线测量数据对比表明，DCBz的检测信号与二恶英生成总量和毒性当量的变化趋势相同，MCBz的检测信号则与二恶英信号的变化趋势不同。

英文摘要：

It is a potential monitoring method using indicators to detect indirectly dioxins online. Chlorobenzene is considered as the appropriate one. Vaccum ultraiolet photo ionization/time-of-flight mass spectrometer （VUV-TOFMS） was used for monitoring of Cl1Bz（MCBz） and 1.2-C12Bz（1.2DCBz） in certain concentration. The signals had good discrimination and signal peak could be above 6. The obtained mean signal intensity showed a good relation with real concentration levels by logarithm fit. The signals of MCBz and 1.2DCBz mainly appeared in the forth to twelfth minute with normal distribution. Comparison between off-line measure and on-line detection showed that signal trend of DCBz was in accordance with the trends of total amounts and toxic equivalent quantity of dioxin, but that of MCBz was different.