Abstract
AbstractRetention of As against extraction by NH4OAc and Bray P‐1 reagents from Wisconsin soils equilibrated with As (0, 80, and 320 µg As/g added as Na2HAsO4) increased as the sesquioxide content increased. Similarly, the amount of As sorbed from solution increased as the free Fe2O3 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 NH4F and NaOH reagents during chemical fractionation. Because As released during extraction with NH4F is sorbed by soil components during the same extraction, NH4F‐As is underestimated unless a correction for resorption is made.
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