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Cation‐Exchange Equilibrium Constants of Aluminum‐Saturated Montmorillonite and Vermiculite Clays
Author(s) -
Foscolos A. E.
Publication year - 1968
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/sssaj1968.03615995003200030026x
Subject(s) - montmorillonite , vermiculite , chemistry , cation exchange capacity , clay minerals , chloride , ion exchange , mineralogy , inorganic chemistry , nuclear chemistry , soil water , geology , soil science , ion , organic chemistry , paleontology
Equilibrium constants of aluminum‐saturated montmorillonite and vermiculite clay minerals were studied in chloride‐salt solutions at concentrations similar to those occurring in soil. Studies were limited to cations occurring most abundantly in soil solutions, viz., H + , Na + , K + , Mg 2+ , and Ca 2+ . The order of relative replacing power in the lyotropic series was found to be: Colony Wyoming montmorillonite (90 meq/100g CEC) H < Na < Mg < Ca < K < Al; Otay California montmorillonite (125 meq/100g CEC) H < Na < Mg < Ca < Al < K; Jeffersite vermiculite (175 meq/100g CEC) Mg < Ca < H < Al < Na.