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题名: Design and application of membrane inlet-time-of-flight mass spectrometer for rapid analysis of volatile organic compounds
作者: Hou Ke-Yong;  Chen Xin-Hua;  Dong Can;  Li Jing-Hua;  Yao Lian;  Wang Hai-Long;  Wang Jun-De;  Li Hai-Yang
关键词: membrane inlet ;  time-of-flight mass spectrometer ;  rapid analysis ;  soft ionization
刊名: CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
发表日期: 2007-07-01
卷: 28, 期:7, 页:1240-1245
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: This article describes a membrane inlet-miniature time-of-flight mass spectrometer. Double silicone sheet membranes with a thickness of 50 mu m was used as interface for the atmospheric pressure direct sample inlet. The experimental result indicates that the enrichment factor of membrane is increased with the increase of the flow speed of the sample, and the signal intensity is almost linear with the gas flow. There is a vacuum differential system between the double membranes and the enriched sample is pulled out quickly, there is almost no memory effect in the membrane inlet system. The response time for benzene, toluene and o-xylene is about 100 s, but it only takes 10 s to get the steady condition after opening the vacuum valve. Comparing with the capillary sample inlet, the enrichment of double membrane is quite effective, the signal intensity for 10 x 10(-6) (volume fraction) benzene, toluene and o-xylene is enhanced 280, 370 and 600 times, when the membrane inlet was used under the same experimental conditions. Combining with vacuum ultraviolet soft ionization, the detection limit of the membrane inlet mass spectrometer is 25 x 10(-9) (volume fraction) for benzene, and the linear dynamic range is about three orders of magnitude. The soft ionization is fragment free and qualitative analysis quickly according to the molecular weight of compounds. The instrument was used to on-line analyze volatile organic compounds (VOCs) in mainstream cigarette smoke, more than fifty compounds of VOCs on a mass spectrum were observed. The results indicate that the membrane inlet-time-of-flight mass spectrometer will be useful for a wide range of field application, particularly for environmental monitoring.
关键词[WOS]: SINGLE-PHOTON IONIZATION ;  POLYCYCLIC AROMATIC-HYDROCARBONS ;  MULTIPHOTON IONIZATION ;  ONLINE ANALYSIS ;  CHEMICAL-IONIZATION ;  MULTIMEMBRANE INLET ;  CIGARETTE-SMOKE ;  GAS-ANALYSIS ;  AIR SAMPLES ;  COMBUSTION
语种: 英语
WOS记录号: WOS:000248202500009
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140674
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
2.Anyant Inst Technol, Dept Elect Engn, Anyang 455000, Peoples R China
3.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

Recommended Citation:
Hou Ke-Yong,Chen Xin-Hua,Dong Can,et al. Design and application of membrane inlet-time-of-flight mass spectrometer for rapid analysis of volatile organic compounds[J]. CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,2007,28(7):1240-1245.
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