멤브레인 콘택터를 이용한 탈이온수 내 용존 CO2와 탄소-13 동위원소의 실시간 측정 (Real-time Measurement of Dissolved CO2 and Carbon-13 Isotope Using Membrane Contactor)

서지정보

· 발행기관 : 한국지하수토양환경학회
· 수록지 정보 : 지하수토양환경 / 30권 / 1호 / 1 ~ 11페이지
· 저자명 : 채기탁, 김지현, 문수현, 장찬희

초록

This study integrated a Membrane Contactor (MC) with a Tedlar Bag Reactor (TBR) for continuous, real-time monitoringof dissolved CO2 and its carbon isotope (δ13C) in deionized water (DIW). Experiments were conducted in two stagesacross three CO2 concentrations (437, 7,940 ppmv, and 100%). Baseline CO2 (437 ppmv) and δ13C levels were measuredin the first stage, while the second stage involved observing changes after injecting 7,940 ppmv or 100% of CO2 into theTBR. CO2 and δ13C levels were tracked using Cavity Ring-Down Spectroscopy (CRDS) on gas samples extracted throughthe MC. CO2 dissolution led to a significant pH decrease and an increase in electrical conductivity (EC), reflecting CO2’schemical interactions with water. δ13C values showed substantial variation at lower CO2 concentrations, while higher CO2levels resulted in more stable δ13C values with clearer shifts. The findings suggest that the MC system is particularlyeffective for monitoring environments characterized by rapid and dynamic chemical changes, such as geological CO2storage, volcanic gas emissions, earthquake-related gas dynamics, and CO2-rich waters. This research demonstrates thatMC-based systems can enhance field applications by supporting continuous sampling and real-time dissolved gas analysis.

영어초록

This study integrated a Membrane Contactor (MC) with a Tedlar Bag Reactor (TBR) for continuous, real-time monitoringof dissolved CO2 and its carbon isotope (δ13C) in deionized water (DIW). Experiments were conducted in two stagesacross three CO2 concentrations (437, 7,940 ppmv, and 100%). Baseline CO2 (437 ppmv) and δ13C levels were measuredin the first stage, while the second stage involved observing changes after injecting 7,940 ppmv or 100% of CO2 into theTBR. CO2 and δ13C levels were tracked using Cavity Ring-Down Spectroscopy (CRDS) on gas samples extracted throughthe MC. CO2 dissolution led to a significant pH decrease and an increase in electrical conductivity (EC), reflecting CO2’schemical interactions with water. δ13C values showed substantial variation at lower CO2 concentrations, while higher CO2levels resulted in more stable δ13C values with clearer shifts. The findings suggest that the MC system is particularlyeffective for monitoring environments characterized by rapid and dynamic chemical changes, such as geological CO2storage, volcanic gas emissions, earthquake-related gas dynamics, and CO2-rich waters. This research demonstrates thatMC-based systems can enhance field applications by supporting continuous sampling and real-time dissolved gas analysis.

참고자료

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