• Changes of carbon-13 Isotope of Dissolved Inorganic Carbon Within Low-pH CO2-rich Water during CO2 Degassing
  • Chae, Gitak;Yu, Soonyoung;Kim, Chan Yeong;Park, Jinyoung;Bang, Haeun;Lee, Inhye;Koh, Dong-Chan;Shinn, Young Jae;Oh, Jinman;
  • Korea Institute of Geoscience and Mineral Resources (KIGAM);Korea CO2 Storage Environmental Management (K-COSEM) Research Center, Korea University;Korea Institute of Geoscience and Mineral Resources (KIGAM);Korea Institute of Geoscience and Mineral Resources (KIGAM);Korea Institute of Geoscience and Mineral Resources (KIGAM);Korea Institute of Geoscience and Mineral Resources (KIGAM);Korea Institute of Geoscience and Mineral Resources (KIGAM);Korea Institute of Geoscience and Mineral Resources (KIGAM);KNJ engineering Inc.;
  • pH가 낮은 탄산수의 CO2 탈기에 따른 용존탄소동위원소 변화
  • 채기탁;유순영;김찬영;박진영;방하은;이인혜;고동찬;신영재;오진만;
  • 한국지질자원연구원;고려대학교 지구환경과학과 K-COSEM 사업단;한국지질자원연구원;한국지질자원연구원;한국지질자원연구원;한국지질자원연구원;한국지질자원연구원;한국지질자원연구원;KNJ 엔지니어링(주);
Abstract
It is known that ${\delta}^{13}C_{DIC}$ (carbon-13 isotope of dissolved inorganic carbonate (DIC) ions) of water increases when dissolved $CO_2$ degases. However, ${\delta}^{13}C_{DIC}$ could decrease when the pH of water is lower than 5.5 at the early stage of degassing. Laboratory experiments were performed to observe the changes of ${\delta}^{13}C_{DIC}$ as $CO_2$ degassed from three different artificial $CO_2$-rich waters (ACWs) in which the initial pH was 4.9, 5.4, and 6.4, respectively. The pH, alkalinity and ${\delta}^{13}C_{DIC}$ were measured until 240 hours after degassing began and those data were compared with kinetic isotope fractionation calculations. Furthermore, same experiment was conducted with the natural $CO_2$-rich water (pH 4.9) from Daepyeong, Sejong City. As a result of experiments, we could observe the decrease of DIC and increase of pH as the degassing progressed. ACW with an initial pH of 6.4, ${\delta}^{13}C_{DIC}$ kept increasing but, in cases where the initial pH was lower than 5.5, ${\delta}^{13}C_{DIC}$ decreased until 6 hours. After 6 hours ${\delta}^{13}C_{DIC}$ increased within all cases because the $CO_2$ degassing caused pH increase and subsequently the ratio of $HCO_3{^-}$ in solution. In the early stage of $CO_2$ degassing, the laboratory measurements were well matched with the calculations, but after about 48 hours, the experiment results were deviated from the calculations, probably due to the equilibrium interaction with the atmosphere and precipitation of carbonates. The result of this study may be not applicable to all natural environments because the pressure and $CO_2$ concentration in headspace of reaction vessels was not maintained constant as well as the temperature. Nevertheless, this study provides fundamental knowledge on the ${\delta}^{13}C_{DIC}$ evolution during $CO_2$ degassing, and therefore it can be utilized in the studies about carbonated water with low pH and the monitoring of geologic carbon sequestration.

Keywords: Low-pH $CO_2$-rich water;$CO_2$ degassing;Carbon-13 isotope;Geologic $CO_2$ storage;

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