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Exchange Adsorption of Trace Quantities of Cadmium in Soils Treated with Chlorides of Aluminum, Calcium and Sodium
Author(s) -
Lagerwerff J. V.,
Brower D. L.
Publication year - 1972
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/sssaj1972.03615995003600050017x
Subject(s) - chemistry , vermiculite , loam , adsorption , cadmium , soil water , sodium , cation exchange capacity , kaolinite , montmorillonite , illite , ion exchange , inorganic chemistry , salt (chemistry) , nuclear chemistry , environmental chemistry , clay minerals , mineralogy , geology , soil science , organic chemistry , ion , paleontology
The exchange adsorption of Cd has been studied in Cecil sandy loam (clay fraction 45% kaolinite and 25% vermiculite), Winsum clay loam (clay fraction 80% illite), and Yolo silt loam (clay fraction 47% montmorillonite and 22% mica). Experimental variables were the major cations Al 3+ , Ca 2+ , and Na + , salt (chloride) levels (from 5 to 50 meq/liter), and the initial concentration of CdCl 2 (from 22 to 170 µeq/liter). The exchange of Cd 2+ in Al 3+ ‐ and Ca 2+ ‐treated soils was normal in that the adsorption was greater in the presence of Ca 2+ than of Al 3+ , and decreased with increasing concentration of AlCl 3 or CaCl 2 . In the Na + ‐treated, alkalized soils, Cd 2+ did not precipitate. The exchange was unusual because the adsorption of Cd 2+ decreased as NaCl concentrations decreased. The same behavior was shown by 109 Cd 2+ . At NaCl concentrations decreasing below 30 meq/liter, the adsorption of Ca 2+ by Na + ‐treated soils also decreased, as did the adsorption of Na + . The result was attributed to decreasing soil exchange capacity with decreasing NaCl concentration due to increased adsorption of products derived from alkaline corrosion of the soil matrix.