摘要
垃圾焚烧处理是二噁英的主要产生源之一,在二噁英的形成阶段会先形成氯苯、氯酚、多环芳烃等二噁英类前生体。这些前生体浓度较高,并且与二噁英类毒性当量存在密切关联。对前生体的在线检测研究已成为主要研究方向之一。本研究利用自制的纳秒真空紫外电离-飞行时间质谱仪,发展了一种快速测量气相条件下氯苯、多氯酚、萘等方法,并通过标准样测试对该方法进行了实验评估。对于氯苯标准样,在5~100μg/L范围内,用本方法获得的母体离子信号强度与浓度呈现良好的线性关系。
Waste incineration has been considered as a main source of dioxins. During the generation of dioxins, dioxin precursors, such as polychlorinated benzenes （PCBz）, polychlorinated phenols （PCPh）, polycyclic aromatic hydrocarbon （PAHs）, polychlorinated biphenyls （PCBs） etc., have been proved to be produced with much higher concentrations than dioxins, which had been determined to be closely related to dioxin toxic equivalents. Therefore, online monitoring of these precursor compounds has been becoming one of the main research directions of dioxin detection. In this paper, we reported our attempt on developing a new method for online detection of these dioxin precursors in gas phase, by nanosecond vacuum ultraviolet single photon ionization technique, combined with time-of-flight mass spectrometer. This setup was evaluated by monitoring chlorobenzene, polychlorinated phenols and naphthalene in gas phase. In the range of 5-100μg/L, parent ion signal intensity of chlorobenzene exhibits linear dependence on the concentration.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2014年第2期173-178,共6页
Chinese Journal of Analytical Chemistry
基金
国家高技术研究发展计划(863)资助项目(No.2011AA060602)~~
关键词
二噁英前生体
飞行时间质谱
真空紫外
单光子电离
Dioxin precursors
Time-of-flight mass spectrometry
Vacuum ultraviolet
Single photon ionization
