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KMID : 0385520080210060495
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Analytical Science & Technology
2008 Volume.21 No. 6 p.495 ~ p.501
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Feasibility study of membrane interface for gas chromatograph-mass spectrometry
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Kang Gil-Seon
Lee Dong-Soo
Lee Hwa-Sim
Park Chang-Joon
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Abstract
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Agilent 5973 GC-MS instrument was modified so that the capillary direct interface was removed and that a silicone membrane was installed between GC and MS. Feasibility study of the membrane interface GC-MS has been carried out. Vacuum of the mass spectrometer was not affected by the carrier gas flow rate up to 4.7 ㎖/min. As the carrier flow rate was increased, peak tailing was reduced and chromatogram peaks appeared earlier. Chromatogram peaks showed better separation and higher sensitivity as the membrane thickness was reduced from 127 ㎛ to 75 ㎛, and also as the interface temperature was increased. However, the membrane interface GC-MS had drawbacks such as background ions at 73 and 147 m/z and poor peak separation due to peak tailing.
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KEYWORD
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GC-MS, membrane interface, carrier gas flow rate, membrane thickness
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