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Thermodynamic Consideration on the Occurrence of $Al_{13}$-Tridecamer in the Natural Conditions  

이규호 (연세대학교 지구시스템과학과)
송유구 (연세대학교 지구시스템과학과)
문희수 (연세대학교 지구시스템과학과)
문지원 (연세대학교 지구시스템과학과)
김인준 (한국지질자원연구원)
Publication Information
Economic and Environmental Geology / v.35, no.2, 2002 , pp. 103-112 More about this Journal
Abstract
Despite the ecological importance of potentially phytotoxic $Al_{13}$-tridecamer and its formation in the simulated condition, it was not recognized in the natural soil environment. Here we performed thermodynamic calculations to examine the stability condition of $Al_{13}$-tridecamer based on the solubility of AI in the Bo horizon of Andisols, Jeju Island, dominantly composed of AI-containing solid phases such as $Al(OH)_{3}$, proto-imogolite and/or imogolite. We have found that $Al(OH)_{3}$, proto-imogolite and/or imogolite may control Al solubility in the moderate acid condition. It means that AI total activity of the soil solution equilibrated with these solid phases ranges from $10^{-6}$ ~ $10^{-8}$M in the pH 5 to 7. Calculations based on the thermodynamic data strongly indicate that the formation of $Al_{13}$-tridecamer closely related to the total activity of AI in the system. For example, for the formation of $Al_{13}$-tridecamer of $10^{-5}$M, Al total activity of $3{\times}10^{-3}$M are needed at pH 4, and $2{\times}10^{-5}$M in the pH 5 to 7. Therefore, this research and the thermodynamic consideration suggest strongly that $Al_{13}$-tridecamer should be negligible in natural soils, especially Andisols and Spodosols, These mainly contain $Al(OH)_{3}$, proto-imogolite and/or imogolite, which could prevent the formation of $Al_{13}$-tridecamer by controlling the AI total activity low. It means that the toxicity of $Al_{13}$-tridecamer with the increase of soil acidification may be considered to be definitely low.
Keywords
$Al_{l3}$-tridecamer; gibbsite; imogolite; proto-imogolite; soil acidification;
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