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Exchange Capacity and Adsorbed‐Cation Charge as Affected by Chloride and Perchlorate
Author(s) -
Rhue R. Dean,
Reve W. H.
Publication year - 1990
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/sssaj1990.03615995005400030012x
Subject(s) - adsorption , chemistry , perchlorate , cation exchange capacity , inorganic chemistry , ion exchange , ion , clay minerals , chloride , mineralogy , soil water , organic chemistry , soil science , environmental science
Previous reports in the literature have indicated that apparent differences in adsorbed‐cation charge can be obtained with Cl and ClO 4 media as a result of the adsorption of the bivalent cation complex CaCl. Since the original studies dealt only with smectite clay, it was of interest to determine whether these differences could be observed for other soil and clay materials. Both cation‐exchange capacity (CEC) and adsorbed‐cation charge were measured in Cl and ClO 4 media using Na or Ca as the exchangeable cations. In no case was there an effect of the anion on either CEC or adsorbed‐cation charge when Ca was the predominant exchangeable cation. Furthermore, CEC and adsorbed‐cation charge were not significantly different. Studies with SAz‐1 clay showed that, when Na was the only exchangeable cation in the system, the adsorbed‐cation charge was significantly less than the CEC. This difference was attributed to negative adsorption of the anion and its contribution to the total adsorbed charge. Greater adsorbed‐cation charge in Ca‐saturated systems, compared with Na‐saturated systems, was observed for SAz‐1 clay in both Cl and ClO 4 systems.