한국해양학회지:바다 (The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY)

  • 제12권3호
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  • Pages.244-250
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  • 2007
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  • 1226-2978(pISSN)
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  • 2671-8820(eISSN)
한국해양학회 (The Korean Society of Oceanography)
권호 표지

Membrane Inlet Mass Spectrometer (MIMS) 시스템을 이용한 해수 및 퇴적물 공극수내 용존 메탄의 측정

Dissolved Methane Measurements in Seawater and Sediment Porewater Using Membrane Inlet Mass Spectrometer (MIMS) System

  • 안순모 (부산대학교 지구환경시스템학부) ;
  • 권지남 (부산대학교 지구환경시스템학부) ;
  • 임재현 (부산대학교 지구환경시스템학부) ;
  • 박윤정 (부경대학교 미생물학과) ;
  • 강동진 (서울대학교 지구환경과학부/해양연구소)
  • An, Soon-Mo (Division of Earth Environmental System/Marine Science Major, Pusan National University) ;
  • Kwon, Ji-Nam (Division of Earth Environmental System/Marine Science Major, Pusan National University) ;
  • Lim, Jea-Hyun (Division of Earth Environmental System/Marine Science Major, Pusan National University) ;
  • Park, Yun-Jung (Department of microbiology, Pukyung National University) ;
  • Kang, Dong-Jin (School of Earth & Environmental Sciences/Research Institute of Oceanography, Seoul National University)
  • 발행 : 2007.08.31
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초록

MIMS 시스템은 액체 시료의 용존 가스 농도를 정확하게 측정하는데 이용되어 왔는데, 본 연구에서는 해수와 퇴적물 공극수에 존재하는 용존 메탄 농도를 정량화하는데 사용되었다. 측정의 정밀성을 파악하기 위하여, 여러 분압의 메탄 농도에 대해서 포화된 액체 시료를 준비하였으며 이를 MIMS 시스템으로 측정하였다. 측정된 값은 용존 기체의 포화 상수로부터 계산된 값과 잘 일치하였다. 측정의 표준 오차는 평균값의 $0.13{\sim}0.9%$ 정도였다. 이 시스템을 이용하여 한반도 남해안 인근 해수의 용존 메탄 농도를 측정한 결과, 용존 메탄의 깊이별 분포는 물리적인 요소가 좌우하고 있음을 알 수 있었다. MIMS system을 이용하여, 각 수괴 간의 미세한 용존 메탄 농도의 차이를 구분하여 살펴볼 수 있었다. 또 다른 실험에서는 MIMS 시스템의 inlet 부분을 탐침 형태로 제작하여 퇴적물 깊이에 따른 용존 메탄을 측정할 수 있었다.

Membrane inlet mass spectrometer (MIMS) has been used to accurately quantify dissolved gases in liquid samples. In this study, the MIMS system was applied to measure dissolved methane in seawater and sediment porewater. To evaluate the accuracy of the measurement, liquid samples saturated with different methane partial pressure were prepared and the methane concentrations were quantified with the MIMS system. The measured values correspond well with the expected values calculated from solubility constants. The standard error of the measurements were $0.13{\sim}0.9%$ of the mean values. The distribution of dissolved methane concentration in seawater of the South Sea of Korea revealed that the physical parameters primarily control the methane concentration in sea water. The MIMS system was effective to resolve the small dissolved methane difference among water masses. The probe type inlet in MIMS system was proven to be effective to measure porewater methane concentration.

키워드

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