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Reaction of Copper Tetrammine With Bentonite Clay
Author(s) -
ElSayed M. H.,
Burau R. G.,
Babcock K. L.
Publication year - 1971
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/sssaj1971.03615995003500040027x
Subject(s) - bentonite , copper , sorption , endothermic process , cation exchange capacity , chemistry , dilution , clay minerals , ion exchange , inorganic chemistry , environmental chemistry , mineralogy , geology , adsorption , soil water , soil science , thermodynamics , organic chemistry , ion , geotechnical engineering , physics
Copper (II) tetrammine was accumulated by bentonite in amounts greatly exceeding its cation exchange capacity. Analyses of sorption isotherms disclosed that at least two distinct reactions were involved. The first was completed at low equilibrium concentration and appeared to be insensitive to temperature changes. The second was an endothermic process that simulated compound formation. Exchangeable Cu(NH 3 ) 4 2+ on the clay was evaluated by isotopic dilution and its exchange reaction with calcium was investigated. It is doubtful that Cu(NH 3 ) 4 2+ can be used directly to assess copper exchange capacity of clays.