激光解吸/激光电离-质谱法二恶英及其关联物的在线检测  

Online detection of dioxin and dioxin-related substances using laser desoption/laser ionization-mass spectrometry

作　　者：李阿丹[1] 洪伟[2] 王晶[1] 

机构地区：[1]燕山大学环境与化学工程学院,河北秦皇岛066004 [2]中华人民共和国秦皇岛出入境检验检疫局,河北秦皇岛066000

出　　处：《燕山大学学报》2015年第6期511-515,共5页Journal of Yanshan University

基　　金：河北省自然科学基金资助项目(B2014203137);燕山大学青年教师自主研究计划课题(13LGA014)

摘　　要：本研究使用毛细管直接进样法,利用气体绝热膨胀过程的冷却效果使样品和载气分子凝结、浓缩于毛细管端口,再利用脉冲激光解吸技术将样品解吸以脉冲气流的方式引入质谱,通过考察毛细管加热温度、解吸激光能量、解吸激光与电离激光之间的延迟时间等因素确立了有效的分析条件,实现了对氯苯酚、五氯苯等5种化合物的在线检测。相对于传统的连续导入方式,脉冲式导入方式增加了样品浓缩的环节有利于降低检出限。同时本实验中高密度飞秒电离激光的采用也确保了解吸后的分子能够被共振增强双光子电离,增强了分析的灵敏度。A direct injection method with a capillary was utilized to realize the cooling and condensing effect of the molecules of the carrier gas and the gas samples.The molecules concentrated on the capillary port were introduced into the mass spectrometer with a desorption laser, and then ionized by a femtosecond laser with a resonance-enhanced two-photon ionization process which can increase the sensitivity.The online analysis condition of the p-cholorophenol and pentachlorobenzene altogether 5 compounds was confirmed by checking the capillary heating temperature, desorption laser energy and the time delay between desorption laser and the ionization laser.Compared with the traditional continuous introduction mode, pulse introduction method can reduce the detection limits because of the condensing step.

关 键 词：二恶英 在线检测 激光解吸 多光子电离 电离效率 

分 类 号：O657.63[理学—分析化学]