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Ca$$^{2+}$$-Fe$$^{2+}$$ and Ca$$^{2+}$$-Mn$$^{2+}$$ exchange selectivity of kaolinite, montmorillonite, and illite

Saeki, Kazutoshi*; Wada, Shinichiro*; Shibata, Masahiro 

The Gains-Thomas ion exchange selectivity coefficients, KGT of Fe$$^{2+}$$ and Mn$$^{2+}$$ on three types of Ca$$^{2+}$$-saturated clay minerals (kaolinite, montmorillonite, and illite) were determined in an oxygen-free condition (O$$_{2}$$ $$<$$ 0.0001 %) in order to understand better the behaviors of these ions in anaerobic soils. The results indicate that KGT values for Ca$$^{2+}$$-Fe$$^{2+}$$, Ca$$^{2+}$$-Mn$$^{2+}$$ exchange reactions on kaolinite and montmorillonite are close to unity. The KGT value for Ca$$^{2+}$$-Fe$$^{2+}$$ exchange on illite were markedly higher than those for on the other clay minerals. The organic carbon contained in the illite specimen may have affected the results. The present study showed that Fe$$^{2+}$$ and Mn$$^{2+}$$ are adsorbed on the surface of layered silicate clay minerals, with selectivity similar to Ca$$^{2+}$$. Thus, Fe$$^{2+}$$ and Mn$$^{2+}$$ behave like alkaline-earth cations such as Ca$$^{2+}$$ in soils, sediments and aquifers dominated by layered silicate clay minerals.

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Category:Soil Science

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