Abstract
AbstractBinary and ternary cation exchange experiments were performed with Na+, Ca2+, and Mg2+ on Silver Hill illite and on a soil illite suspended in 50 mol m−3 perchlorate at pH 7. The binary experiments indicated no preference for Ca over Mg on the specimen illite, but selectivity for bivalent cations over Na+ and for Ca2+ over Mg2+ on the soil illite. The ternary exchange data showed that, for both illites, there was no effect of adsorbed Na on the Ca‐Mg exchange isotherm at exchangeable sodium percentages from 0 to 30%, either for freshly‐prepared clay suspensions or for those aged up to 270 d in NaClO4. No significant differences in the total adsorbed metal charge (Qo) were observed among the binary and ternary exchange experiments, and Qo was independent of the degree of bivalent cation saturation (ECa or EMg) in the Na → Ca and Na → Mg exchange experiments on the soil illite. The Vanselow selectivity coefficient for Mg → Ca exchange on the soil illite decreased as ECa increased, showing a plateau near ECa ≈ 0.6 and dropping to 1.0 as ECa became equal to 1.0. This behavior was interpreted as evidence for at least two classes of surface complex involving Ca and Mg.
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