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Sodium‐Calcium‐Magnesium Exchange Reactions on a Montmorillonitic Soil: II. Ternary Exchange Reactions
Author(s) -
Fletcher Philip,
Holtzclaw Kenneth M.,
Jouany Claire,
Sposito Garrison,
LeVesque C. S.
Publication year - 1984
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/sssaj1984.03615995004800050014x
Subject(s) - magnesium , chemistry , sodium , calcium , inorganic chemistry , ternary operation , silt , cation exchange capacity , soil water , soil science , geology , organic chemistry , paleontology , computer science , programming language
The exchange of magnesium for calcium at 298 K on a montmorillonitic soil separate (principally clay and silt) was investigated in a 50 mol m −3 perchlorate background at pH 5,6, and 7. The charge fraction of sodium in the aqueous solution phase was controlled at 0.70 or 0.85 during the exchange experiments, resulting in average exchangeable sodium percentages ranging from 5 to 25% on the soil. Exchange isotherms for magnesium indicated some preference on the soil for calcium over magnesium. This preference was attributed primarily to the presence of organic matter associated with the soil separate. However, the exchange isotherms showed no effect of pH in the range between 5 and 7, and no effect of exchangeable sodium percentage in the range between 0 and 25%.