Analytical Science and Technology (분석과학)

The Korean Society of Analytical Sciences (한국분석과학회)
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NMHCs measurement using a cryogenic concentration system and application on gas samples

저온농축장치를 이용한 NMHCs의 측정법과 가스 시료에 적용

  • Kim, Su Ha (Science of Measurement, University of Science and Technology) ;
  • Moon, Dong Min (Center for Gas Analysis, Korea Research Institute of Standards and Science) ;
  • Kim, Jin Seog (Science of Measurement, University of Science and Technology)
  • 김수하 (과학기술연합대학원대학교 측정과학과) ;
  • 문동민 (한국표준과학연구원 대기환경표준센터) ;
  • 김진석 (과학기술연합대학원대학교 측정과학과)
  • Received : 2012.10.30
  • Accepted : 2012.11.21
  • Published : 2012.12.25
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Abstract

In this study, we have developed a cryogenic concentration system for the analysis of non-methane hydrocarbons (NMHCs) in air sample. NMHCs with nmol/mol level of concentrations in the atmosphere were quantified by a comparative method with certified reference gas mixture. GC/FID with cryogenic concentration system operated in the range from $-67^{\circ}C$ to $180^{\circ}C$ was adopted. After cryogenic concentration, a fast desorption by heating could achieve a large amount of sample injection into the GC/FID. The linearity of the system was verified with the peak areas of NMHCs of the concentration amount of sample. The reproducibility is less than 10% and the limit of detection (LOD) is 0.1 nmol/mol. For the application of this system, we analyzed NMHCs in gas samples taken from air and soil in Daejeon, Seosan and Goheung.

본 연구에서는 테들러백에 포집한 가스 시료 중의 NMHCs 성분의 분석을 위한 저온농축장치 시스템을 개발하였다. 개발한 저온농축장치는 냉동고를 이용하여 $-67^{\circ}C$에서 시료를 농축한 후 $180^{\circ}C$의 고온으로 탈착하는 시스템을 제작하였고, 많은 양의 시료가 GC/FID로 주입되게 함으로써 대기 중에 nmol/mol 농도(ppb)의 미량으로 존재하는 가스의 정량을 가능하게 하였다. 저온농축장치의 신뢰성을 위해 수행한 실험에서 농축시간과 피이크 면적이 비례함을 확인하였고, 10% 이내의 재현성과 0.1 nmol/mol의 검출한계를 확인하였다. 본 실험 방법을 실제 시료에 적용하기 위하여 대전, 서산, 고흥의 대기시료와 토양시료에서 채취한 가스 중의 NMHCs를 분석하였다.

Keywords

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