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Experimental Determination of Kinetic Fractionation of Carbon and Oxygen Isotopes During CO2 Hydration

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Title:Experimental Determination of Kinetic Fractionation of Carbon and Oxygen Isotopes During CO2 Hydration
Authors:Yumol, Lauren Michele
Contributors:Zeebe, Richard (advisor)
Oceanography (department)
Keywords:Chemical oceanography
Date Issued:2019
Publisher:University of Hawai'i at Manoa
Abstract:The CO2 hydration reaction is a fundamental chemical transformation involved in various physicochemical, geochemical, and biological processes, and essential in aqueous solutions that contain dissolved inorganic carbon (DIC). In marine environments, the CO2 hydration reaction and its affiliated products (i.e.H2CO3 , HCO3, CO3, and H+) play a critical role in regulating ocean pH, biogenic and inorganic mineral precipitation, biological carbon fixation, carbon sequestration, and more. There is a characteristic kinetic isotope effect (KIE) that is associated with the CO2 hydration reaction, which causes the reaction product to be depleted in the heavy isotopes of carbon and oxygen. It is important to understand how KIEs influence carbon and oxygen isotope compositions because the isotopic compositions of substances or compounds that form from HCO3 (i.e. the product of CO2 hydration ( CO2 +H2O )), for example carbonate minerals used as indicators of past environments, will also be affected. Despite evidence of KIEs occurring in the environment, there are only a few experimental studies that have attempted to characterize kinetic isotope fractionation (KIF) during the hydration of CO2 , but the KIFs reported in those studies suggest more experimental work is needed to better define KIEs during CO2 hydration. In Chapter 1, we define important terminology that will be used throughout this thesis, describe the KIEs that are associated with the CO2 hydration reaction, and explain how KIF is related to equilibrium isotope fractionation. We will also discuss the previous experimental and theoretical studies and the KIFs reported in those studies. The overall purpose and main objective of this study is to produce the most reliable experimental data available today by experimentally determining KIEs during CO2 hydration in carbon and oxygen isotopes.
Pages/Duration:79 pages
Appears in Collections: M.S. - Oceanography

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