Feasibility study of membrane interface for gas chromatograph-mass spectrometry

기체크로마토그래프-질량분석기의 실리콘 분리막 인터페이스의 유용성 연구

  • Kang, Gil Seon (Advanced Instrumentation Center, Korea Research Institute of Standards and Science) ;
  • Lee, Dong Soo (Department of Chemistry, Yonsei University) ;
  • Lee, Hwa Sim (Department of Chemistry, Yonsei University) ;
  • Park, Chang Joon (Advanced Instrumentation Center, Korea Research Institute of Standards and Science)
  • 강길선 (한국표준과학연구원 차세대계측기개발센터) ;
  • 이동수 (연세대학교 화학과) ;
  • 이화심 (연세대학교 화학과) ;
  • 박창준 (한국표준과학연구원 차세대계측기개발센터)
  • Received : 2008.10.08
  • Accepted : 2008.12.01
  • Published : 2008.12.25

Abstract

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 $4.7m{\ell}/min$. 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 $127{\mu}m$ to $75{\mu}m$, 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.

Keywords

GC-MS;membrane interface;carrier gas flow rate;membrane thickness

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