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大气中挥发性有机物在线监测系统
引用本文:刘兴隆,曾立民,陆思华,于雪娜.大气中挥发性有机物在线监测系统[J].环境科学学报,2009,29(12):2471-2477.
作者姓名:刘兴隆  曾立民  陆思华  于雪娜
作者单位:北京大学环境科学与工程学院,环境模拟与污染控制国家重点联合实验室,北京,100871
基金项目:国家高技术研究发展计划(863)项目(No. 2006AA06A301)
摘    要:一种新型的监测大气中挥发性有机物(包括含氧挥发性有机物)的在线监测系统被研制,即将超低温冷阱捕集-热解析装置与气相色谱-质谱仪联用.其分析方法是大气样品经除水、除O3后以60 mL·min-1的流速通过温度为-150℃的超低温冷阱捕集5min,然后样品在110℃下解析后进入GC-FID/MS系统进行分析,时间分辨率为1h.系统使用混和标气进行标定.目标化合物定量曲线的R2值为0.9137~0.9998,相对标准偏差(RSD)均小于10%.将系统与相关商业化的VOC在线监测仪器进行比对,对于相同目标化合物进行分析,其相关系数r在0.7412~0.9620之间.

关 键 词:挥发性有机化合物    低温捕集    在线监测    气相色谱-质谱仪
收稿时间:2009/2/26 0:00:00
修稿时间:7/22/2009 1:38:52 PM

Online monitoring system for volatile organic compounds in the atmosphere
LIU Xinglong,ZENG Limin,LU Sihua and YU Xuena.Online monitoring system for volatile organic compounds in the atmosphere[J].Acta Scientiae Circumstantiae,2009,29(12):2471-2477.
Authors:LIU Xinglong  ZENG Limin  LU Sihua and YU Xuena
Institution:State Joint Key Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871,State Joint Key Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871,State Joint Key Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871 and State Joint Key Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871
Abstract:A new online monitoring system for atmospheric volatile organic compounds, including oxygenated volatile organic compounds, was developed with a combination of cryo-trapping-thermal desorption and GC-FID/MS ( Gas chromatography-Flame Ionization Detector/Mass Spectrometry). Water and ozone were removed to avoid interference. Ambient air was collected with an air flow rate of 60 mL. min~(-1) at-15℃ for S minutes, then the sample was desorbed by beating to 110℃ and the volatile organic compounds were detected by GC-FID/MS. The time resolution is 1 h. The system was calibrated with multi-component standards. The calibration results indicated good regression results for target compounds with R~2 = 0. 9137 -0. 9998 and relative standard deviation ( BSD% )below 10%. The newly developed system showed a similar variation of VOC species concentrations to those currently used incommercial online instruments, and the correlation coefficients (r) ranged between 0. 7412 and 0. 9620.
Keywords:VOCs  cryo-trapping  online monitoring  GC-FID/MS
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