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Characterization of Hydrophobic and Hydrophilic membrane using Portable membrane introduction mass spectrometer[우수포스터-물리화학]

2009년 8월 21일 15시 24분 21초
34P161포 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
목 <발표Ⅱ>
저자 및
박민정, 김태규
부산대학교 화학과, Korea
We have developed a sheet-membrane interfaced portable time-of-flight mass spectrometer with an electron impact ionization source. It has several advantages that include high sensitivity, simplicity, low cost, rapid analysis, in-situ monitoring, and ease of operation. Selective transport of volatile organic compounds in air into a time-of-flight mass spectrometer through a hydrophobic polydimethylsiloxane(PDMS) membrane was measured and monitored. The detection limits for the volatile organic compounds(VOCs) studied were determined to be 0.2~10 ppm, which have a dynamic range of over three order of magnitude. The total analysis of sample takes less than 1 minute. Unlike the PDMS membrane, a hydrophilic Nafion membrane allows to transport the hydrophilic compounds. We have monitored the behavior of the Nafion membrane for the analysis of low molecular weight alcohols. The permeability of hydrophilic compounds was converted to diffusion coefficients. The transport process of analyte through the membrane can be described by using non-steady state permeation equation. These results indicate that not only hydrophobic compounds but also hydrophilic compounds can be detected by portable membrane inlet mass spectrometer. The sheet-membrane interfaced time-of-flight mass spectrometer can be applicable to various fields, such as monitoring of environmental, biological and chemical processes.