Abstract
Ion exchange experiments with 1M ammonium acetate on model clay minerals, after different pretreatments (untreated samples and extraction with ammonium acetate or oxalate buffer solutions) and spiking with cadmium (Cd), manganese (Mn), nickel (Ni), and zinc (Zn), indicate different modes of trace metal incorporation into fine-grained minerals. Kaolinite showed almost complete exchange of adsorbed metals independent of both treatment and reaction times. However, the mobilities of Mn and Ni, and to a lesser extent of Zn and Cd, adsorbed onto three-layer minerals (montmorillonite, illite, and smectite/illite) are reduced after removal of Fe/Mn oxyhydrate coatings. Enhanced fixations of trace metals suggest diffusion into structural units of the three-layer clay minerals, and also substitution of major cations of similar size in the octahedral units. This is particularly efficient at lower concentrations of competing Fe/Mn oxide sorption sites. Diagenetic effects of these diffusion-type processes presumably contribute to a strong fixation of toxic metals onto fine-grained sediment components—greater than can be expected from thermodynamic considerations of mineral stabilities.
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© 1986 Springer-Verlag New York Inc.
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Helios-Rybicka, E., Förstner, U. (1986). Effect of Oxyhydrate Coatings on the Binding Energy of Metals by Clay Minerals. In: Sly, P.G. (eds) Sediments and Water Interactions. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-4932-0_32
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DOI: https://doi.org/10.1007/978-1-4612-4932-0_32
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