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THE INTERACTION OF PHOSPHATE WITH AN ANION EXCHANGE RESIN
Author(s) -
CHRISTENSEN HANS HENRIK,
POSNER ALAN M.
Publication year - 1980
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.1365-2389.1980.tb02094.x
Subject(s) - phosphoric acid , chemistry , phosphate , ion exchange resin , adsorption , inorganic chemistry , ion , ion exchange , sodium hydroxide , inflection point , hydroxide , breakthrough curve , organic chemistry , geometry , mathematics
Summary Phosphate adsorbed on an anion exchange resin was titrated with sodium hydroxide. The inflection point which corresponds to the second pK value of phosphoric acid in solution, was lowered 0.9 pH‐unit when the acid was absorbed on the resin. This shift was fully explained by the exclusion of H + from the resin due to a Donnan equilibrium. The adsorption characteristic of the single and double charged phosphate ion on an anion exchange resin was examined at different pH values and phosphate:resin ratios. A model was suggested for the observed adsorption pattern.