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THE REACTIONS OF SOLUBLE ALUMINIUM WITH MONTMORILLONITE
Author(s) -
BROWN G.,
NEWMAN A. C. D.
Publication year - 1973
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1973.tb00770.x
Subject(s) - bentonite , aluminium , montmorillonite , chemistry , aluminium chloride , calcium , inorganic chemistry , cation exchange capacity , aluminium hydroxide , barium , chloride , bayer process , magnesium , chemical engineering , soil water , geology , organic chemistry , soil science , engineering
Summary The amount of aluminium sorbed by calcium bentonite from basic aluminium chloride solutions depends on the ratio of OH to A1 in the original solution. Except when OH/A1 = 0, only part of the sorbed A1 is exchanged by dilute solutions of barium or calcium chlorides and the exchange capacity of the clay decreases in proportion to the amount of aluminium retained by the clay. Al‐bentonite appears to contain a mixture of A1 3+ and a basic cation in which OH/Al is 2.5. Neutralizing Al‐bentonite with calcium acetate of pH 7.2 restores only part of the exchange capacity and some charged interlayer aluminium is thought to remain in the clay at this pH. It seems possible, therefore, that charged interlayer aluminium may be found even in soils with a neutral reaction.