• Title/Summary/Keyword: 지구화학반응

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Geostatistical Interpretation of Water Quality and Hydrogeochemistry of shallow Groundwater in the Uljin Area, Korea (지구통계 기법을 활용한 울진 지역 천부 지하수의 수질 및 수리지구화학 특성 해석)

  • 김남진;윤성택;김형수;정경문;김규범
    • Economic and Environmental Geology
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    • v.34 no.2
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    • pp.175-192
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    • 2001

  • We have collected hydrogeochemical data of shallow groundwaters in the Uljin area located at eastern coastal area of Korea. Geostatistical analysis (ANOVA test, cluster analysis, and factor analysis) of the collected data sets was pert'onned, in order to evaluate both the spatial and/or temporal variation of water quality data and the groundwater contamination, as weJl as the principal reactions occurring in the aquifer. Results of the ANOVA test show that regional water chemistry are not significantly changed spatially in eight watersheds. However, some ions such as $Ca^{2+}$, $HCO_{3}^{-}$ and $SO_{4}^{2-}$ show a meaningful watershed variation. Water chemistry variation according to sampling time (season) is not shown, except for $SO_{4}^{2-}$. The cluster analysis shows that significant water chemistry variation is eXplained by the distance from the coast. Factor analysis indicates that the water chemistry is changed according to various factors as follows: in the order of decreasing importance, water-rock interaction (mainly, carbonate dissolution), sea-salt spraying, and then contamination by fertilizers and agrochemicals.

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Chemical Fixation of Carbon Dioxide with Methane (메탄에 의한 이산화탄소의 화학적 고정화)

  • 조영복;김상채;서성규;유의연
    • Proceedings of the Korea Air Pollution Research Association Conference
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    • 2000.11a
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    • pp.389-390
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    • 2000

  • 최근 지구 온난화의 55% 이상을 차지하고 있는 이산화탄소를 유용한 화합물로 전환하고자 메탄을 환원제로 사용한 이산화탄소 개질반응으로부터 합성가스 생성에 관한 연구가 활발히 진행되고 있다. 메탄의 이산화탄소 개질반응은 수증기 개질반응보다 낮은 합성 가스비의 생성, 온실효과를 유발하는 이산화탄소의 저감, 반응의 높은 흡열도를 이용한 화학에너지 전송 시스템의 응용 면에서 그 의의가 있다. (중략)

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Conceptual Geochemical Modelling of Long-term Hyperalkaline Groundwater and Rock Interaction (지구화학 모델을 이용한 장기간의 강알칼리성 지하수-암석의 반응 개념 모델링)

  • Choi, Byoung-Young;Yoo, Si-Won;Chang, Kwang-Soo;Kim, Geon-Young;Koh, Yong-Kwon;Choi, Jong-Won
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.5 no.4
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    • pp.273-281
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    • 2007

  • Hyperalkaline groundwater formed by groundwater-cement components and its reaction with bedrock in a nuclear waste repository were simulated by geochemical modeling. The result of groundwater-cement components reaction showed that the pH of water was 13.3 and the precipitated minerals were Brucite, Katoite, Calcium Silicate Hydrate(CSH1.1), Ettringite, Hematite, and Portlandite. The result of interaction between such minerals and groundwater sampled in Gyeongju area also showed that the pH of groundwater reached 12.4. Interaction between such hyperalkaline groundwater and granite was simulated by kinetic model during $10^3$ years. This result showed that the final pH of groundwater reached 11.2 and the variation of pH was controlled by dissolution/precipitation of silicate and CSH minerals. Groundwater quality was also determined by dissolution/precipitation of silicate, CSH, oxide minerals. Our results show that geochemical modeling of long-term hyperalkaline groundwater and rock interaction can contribute to the safety assessment of engineered barrier by predicting geochemical condition in repository site.

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The Trends in Methanol Oxidation Reaction Mechanisms and Electrochemical Oxidation Catalysts (메탄올 산화 반응 메커니즘과 전기화학 산화 촉매 최신 동향)

  • Sungyool Bong
    • Applied Chemistry for Engineering
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    • v.35 no.2
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    • pp.79-84
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    • 2024

  • Methane is an abundant and renewable hydrocarbon, but it causes global warming as a greenhouse gas. Therefore, methods to convert methane into useful chemicals or energy sources are needed. Methanol is a simple and abundant chemical that can be synthesized by the partial oxidation of methane. Methanol can be used as a chemical feedstock or a transportation fuel, as well as a fuel for low-temperature fuel cells. However, the electrochemical oxidation of methanol is a complex and multi-step reaction. To understand and optimize this reaction, new electrocatalysts and reaction mechanisms are required. This review discusses the methanol oxidation reaction mechanism, recent research trends, and future research directions.

  • https://doi.org/10.14478/ace.2024.1008 인용 PDF