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Charge Characteristics of Soils as Affected by Phosphate Sorption
Author(s) -
Sawhney B. L.
Publication year - 1974
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/sssaj1974.03615995003800010052x
Subject(s) - sesquioxide , sorption , phosphate , chemistry , cation exchange capacity , soil water , inorganic chemistry , ion exchange , environmental chemistry , ion , adsorption , soil science , geology , organic chemistry
The increase in cation exchange capacity (CEC) of six Connecticut soils varied from 11 to 88% on phosphate sorption from dilute solutions. As the phosphate sorbed increased, the exchange capacity also increased. The amount of P required to produce an increase of 1 meq in CEC varied with pH; at pH 5, 80 mg P was required for an increase of 1 meq in CEC while at pH 7.5, only 40 mg P was required for the same increase. The increase in CEC at pH 5 is attributed primarily to the replacement of octahedrally coordinated water molecules on sesquioxide surfaces while at higher pH values, replacement of hydroxyl ions by phosphate ions becomes more important.