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ADSORPTION OF PHOSPHATE BY GIBBSITE
Author(s) -
HELYAR K. R.,
MUNNS D. N.,
BURAU R. G.
Publication year - 1976
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.1365-2389.1976.tb02002.x
Subject(s) - chemistry , adsorption , cadmium , phosphate , strontium , gibbsite , zinc , inorganic chemistry , magnesium , sodium , potassium , divalent , calcium , nuclear chemistry , aluminium , organic chemistry
Summary The effects of the nitrate salts of zinc, cadmium, and strontium on the adsorption of phosphate by gibbsite have been measured at pH 5.5 and 25° C. At solution phosphate concentrations greater than 10 μM strontium and cadmium increased phosphate adsorption whilst zinc had no effect. At lower phosphate concentrations zinc and cadmium increased adsorption of phosphate in a different manner from strontium, sodium, potassium, magnesium, or calcium. Zinc and cadmium at 1 mM concentration inhibited phosphate adsorption, perhaps because they are specifically adsorbed as indicated by pH‐shift data. A postulated surface complex consists of two adjacent adsorbed phosphate ions and a central divalent cation of appropriate size, charge, and possible co‐ordinating properties.