便携式飞行时间质谱仪用于室内甲苯、二甲苯污染快速溯源分析  

Source Determination for Indoor Toluene and Xylene Pollution by Portable Time-of-light Mass Spectrometer

作　　者：周振[1,2] 喻佳俊 黄正旭[1,2] 李雪[1] 李梅[1,2] 李磊[1,2] 谭国斌[3] 麦泽彬 高伟[1,2] 

机构地区：[1]暨南大学大气环境安全与污染控制研究所,广州510632 [2]广州禾信分析仪器有限公司,广州510530 [3]上海大学环境污染与健康研究所,上海200444

出　　处：《分析化学》2015年第5期783-787,共5页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金-广东省联合基金项目(No.U1201232);国家863计划(No.2014AA06A501)资助~~

摘　　要：采用自行研制的高时间分辨便携式飞行时间质谱(Portable time-of-flight mass spectrometry,P-TOFMS),基于网格布点检测法,在污染和通风自净后的条件下,以高暴露风险的甲苯、二甲苯作为VOCs代表物质,实时、在线监测1394 m2室内空气中的甲苯、二甲苯的浓度分布,并根据高时间分辨数据对污染源进行快速解析。结果表明,1.5 h内即可完成室内40个采样点的全部分析工作;污染条件下室内甲苯和二甲苯的最高浓度为2633和223μg/m3;自然通风24 h后,浓度分别降低至113和173μg/m3;2个模拟污染源及1个背景污染源均被准确识别。P-TOF-MS技术在家居、车间等室内空气VOCs污染源快速识别方面具有广阔的应用前景。pollutants Health risk caused by indoor pollution has aroused increasing concerns, and most of indoor are regarded as volatile organic compounds （VOCs）. In this study, indoor VOC source determination based on real-time monitoring was successfully demonstrated by portable time-of-flight mass spectrometer （P-TOF-MS） while toluene and xylene were used as model compounds. The concentration distribution of toluene and xylene in a 1394 m2 room was studied under both contaminated and ventilated conditions. Air samples from 40 sampling sites were analyzed within 1.5 h; the highest concentrations of toluene and xylene were 2633 μg/m3 and 223 μg/m3 when the indoor air was contaminated; however, these concentrations decreased significantly to 113 μg/m3 and 173 μg/m3 after ventilating the room for 24 h. This result indicates P-TOF-MS can be used as a promising technique for indoor （e. g. , home, workshop） VOC monitoring as well as its source determination.

关 键 词：便携式飞行时间质谱仪 室内污染 挥发性有机物 实时在线检测 溯源解析 

分 类 号：X831[环境科学与工程—环境工程] O657.63[理学—分析化学]