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Arsenic Sorption by Soils
Author(s) -
Jacobs L. W.,
Syers J. K.,
Keeney D. R.
Publication year - 1970
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/sssaj1970.03615995003400050024x
Subject(s) - sorption , sesquioxide , chemistry , soil water , extraction (chemistry) , fractionation , oxalate , ammonium oxalate , reagent , arsenic , environmental chemistry , nuclear chemistry , amorphous solid , inorganic chemistry , chromatography , adsorption , organic chemistry , geology , soil science
Retention of As against extraction by NH 4 OAc and Bray P‐1 reagents from Wisconsin soils equilibrated with As (0, 80, and 320 µg As/g added as Na 2 HAsO 4 ) increased as the sesquioxide content increased. Similarly, the amount of As sorbed from solution increased as the free Fe 2 O 3 content of the soils increased. Removal of amorphous Fe and Al components by treatment with oxalate eliminated or appreciably reduced the As sorption capacity of the soil. Amorphous Fe and Al components preferentially sorbed added As, as evidenced by the quantitative removal of added As from equilibrated soils by a single oxalate extraction and the essentially complete recovery of added As by NH 4 F and NaOH reagents during chemical fractionation. Because As released during extraction with NH 4 F is sorbed by soil components during the same extraction, NH 4 F‐As is underestimated unless a correction for resorption is made.