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Evidence Supporting Specific Adsorption of Boron on Synthetic Aluminum Hydroxides
Author(s) -
Beyrouty C. A.,
Van Scoyoc G. E.,
Feldkamp J. R.
Publication year - 1984
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/sssaj1984.03615995004800020010x
Subject(s) - adsorption , hydroxide , boron , chemistry , inorganic chemistry , aluminium , surface charge , point of zero charge , organic chemistry
Aluminum hydroxide gels were precipitated in the presence of boron (B). Both chemical and infrared analyses were used to characterize the B adsorption sites on the Al(OH) 3 . The zero point of charge (ZPC) in a gel containing B was 1.6 to 2.1 pH units lower than a gel without B. This reduction was attributed to an increase in the negative charge of the hydroxide surface as a result of specific adsorption of B. Aging studies revealed that adsorbed B in gels retarded crystal growth of the Al(OH) 3 . The concentration of B in the total gel, in the electrical double layer and on the hydroxide surface was determined colorimetrically. Essentially all adsorbed boron was held onto the hydroxide surface.