Premium
The Mechanism of Phosphate Fixation by Iron Oxides
Author(s) -
Parfitt Roger L.,
Atkinson Roger J.,
Smart Roger St.C.
Publication year - 1975
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/sssaj1975.03615995003900050017x
Subject(s) - lepidocrocite , goethite , phosphate , hydroxide , hematite , inorganic chemistry , chemistry , ferric , adsorption , hydrous ferric oxides , ion , iron phosphate , molecule , amorphous solid , mineralogy , crystallography , organic chemistry , sorption
Infrared spectroscopic techniques have been used to obtain a structural model for the surface reaction between iron oxides and phosphate ions. Two surface hydroxyl ions (or water molecules) are replaced by one phosphate ion. Two of the oxygen atoms of the phosphate ion are coordinated, each to a different Fe 3+ ion, resulting in a binuclear surface complex of the type Fe‐O‐P(O 2 )‐O‐Fe. Evidence is given for phosphate adsorption producing this coordination structure on the surfaces of goethite, hematite, lepidocrocite, β‐ferric hydroxide, and amorphous ferric hydroxide gel.