Cation selectivity in sodium-calcium, sodium-magnesium, and calcium-magnesium exchange on wyoming bentonite at 298 K1 - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Accéder directement au contenu
Article Dans Une Revue Soil Science Society of America Journal Année : 1983

Cation selectivity in sodium-calcium, sodium-magnesium, and calcium-magnesium exchange on wyoming bentonite at 298 K1

Résumé

Exchange isotherms were prepared for Na+ in Na+—»Ca2+ and Na+^Mg2+ exchange reactions, and for Mg2+ in Ca2+—»Mg2+ exchange reactions, at 298 K on Wyoming bentonite suspended in a 0.05M perchlorate background. These isotherms were essentially congruent with the appropriate thermodynamic nonpreference exchange isotherms. It was concluded from this fact that there is essentially no difference in the affinity of montmorillonite clay for Ca2+ vs. Mg2+. However, exchange isotherms prepared for Na+ in Na(I) — Ca(II) and Na(I) — Mg(II) exchange, as well as published ones for Mg(II) in Ca(II) — Mg(II) exchange on montmorillonite suspended in a 0.05M chloride background consistently indicate a slight preference on the clay for Ca(II) over Mg(II). This preference for Ca(II) is concluded to be the result of the formation of CaCl+ complexes, which are more stable thermodynamically and have a greater affinity for the clay than MgCl+ complexes.
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Dates et versions

hal-02728744 , version 1 (02-06-2020)

Identifiants

Citer

Garrison Sposito, Kenneth M Hotzclaw, Claire Jouany, Laurent Charlet. Cation selectivity in sodium-calcium, sodium-magnesium, and calcium-magnesium exchange on wyoming bentonite at 298 K1. Soil Science Society of America Journal, 1983, 47 (5), pp.917-921. ⟨10.2136/sssaj1983.03615995004700050015x⟩. ⟨hal-02728744⟩

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