真空紫外光电离飞行时间质谱仪间接在线检测二恶英前体物  

On-line Detection of Dioxins Precursors with Vacuum Ultraviolet Time-of-flight Mass Spectrometer

作　　者：梁苗[1] 孙万启[1] 张鹏[1] 杨波[1] 束继年[1] 

机构地区：[1]中国科学院生态环境研究中心,北京100085

出　　处：《中国粉体技术》2015年第3期60-64,共5页China Powder Science and Technology

基　　金：中国科学院战略性先导科技专项;编号:XDB05040501

摘　　要：利用自主研发的高灵敏度真空紫外光电离飞行时间质谱仪(VUV-TOFMS),对一氯苯、1,2-二氯苯和1,2,4-三氯苯3种氯苯类二恶英前体物进行在线检测,对聚氯乙烯燃烧产生的模拟烟气、一氯苯的实时浓度进行在线监测,并对燃烧产生的二恶英浓度进行初步量化分析。结果表明:VUV-TOFMS间接实现了对垃圾焚烧二恶英产物的检测;得到了较准确的母体离子信号峰,信号强度与实际浓度的线性关系良好,一氯苯、1,2-二氯苯和1,2,4-三氯苯的检出限(体积分数)分别达到4.7×10-9、8.7×10-9、11.9×10-9。A high-sensitive vacuum ultraviolet time-of-flight mass spectrometer （VUV-TOFMS） researched and developed independently was applied to the on-line detection of three chlorobenzenes used as dioxins precursors including monochlorobenzene, 1, 2-dichlorobenzene, and 1,2,4-trichlorobenzene. The simulated flue gas generated by the combustion of PVC and the real-time concentration of was on-line monitored. The dioxins concentration generated by combustion was quantitatively analyzed. The results show that the detection of dioxins products from waste incineration is indirectly realized by VUV-TOFMS. Accurate and distinct parent molecular ions are observed. The signal intensity of the molecular ion shows a good linear relation with real concentration of the standardgas. The detection limits for monochlorobenzene, 1, 2-dichlorobenzene and 1,2,4-trichlorobenzene are respectively 4.7 ×10-9, 8.7×10-9 and 11.9 ×10-9.

关 键 词：二恶英前体物 真空紫外光电离飞行时间质谱仪 在线检测 

分 类 号：X8[环境科学与工程—环境工程]