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Quaternary Cation Exchange on Silver Hill Illite
Author(s) -
Thellier Catherine,
Sposito Garrison
Publication year - 1988
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1988.03615995005200040015x
Subject(s) - illite , chemistry , ion exchange , metal , aqueous solution , cation exchange capacity , analytical chemistry (journal) , perchlorate , qualitative inorganic analysis , aqueous two phase system , stoichiometry , inorganic chemistry , mineralogy , ion , clay minerals , chromatography , geology , soil water , organic chemistry , soil science
The simultaneous exchange of Na, K, Ca, and Mg on Silver Hill illite suspended in 5 mol m −3 perchlorate background at pH 7 was investigated systematically. Composition data for both the exchanger and the equilibrium aqueous solution phase were obtained directly. The data showed that the total adsorbed metal charge was independent of exchanger composition provided that all four cations were considered. Analysis of the composition data with exchange isotherms and calculated Vanselow selectivity coefficients showed that: (i) K + was preferred over Na + , Ca 2+ , and Mg 2+ , and the preference decreased as E K decreased ( E = charge fraction on the clay mineral); (ii) bivalent cations were preferred only slightly over Na + for E Na > 0.01, whereas for E Na ≤ 0.01, the reverse was true; (iii) no preference was shown in Ca‐Mg exchange at E Na values between 0 and 0.13.