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PHOSPHATE ADSORPTION AND THE DISPLACEMENT OF STRUCTURAL SILICON IN AN ALLOPHANE CLAY
Author(s) -
RAJAN S. S. S.
Publication year - 1975
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.1365-2389.1975.tb01949.x
Subject(s) - allophane , phosphate , adsorption , silicate , silicon , chemistry , ion , inorganic chemistry , materials science , organic chemistry
Summary Phosphate was adsorbed at a constant pH, on allophane clay samples which had been pre‐treated with selenite to remove adsorbed silicate. The concomitant release of selenium, silicon, and hydroxyl ion on phosphate adsorption was also measured. The results are compared with those obtained from a similar experiment conducted using clay which had not been treated and they substantiate the earlier conclusion that phosphate displaces structural silicon of clays. The amount displaced increases parabolically with increasing levels of phosphate adsorbed over the concentration range studied.