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Arsenic Sorption by Soils¹

ABSTRACT

Retention 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.

¹ Contribution from the Dept. of Soil Science, University of Wisconsin, Madison. Supported in part by Training Grant WP-100 of the Federal Water Pollution Control Administration of the U.S. Department of the Interior. Presented before Div. S-2 and S-4, Soil Science Society of America, Detroit, Mich., Nov. 13, 1969. Approved for publication by the Director of the Research Division, College of Agricultural & Life Sciences, Univ. of Wisconsin.

² Graduate Research Assistant, Associate Professor, and Associate Professor of Soil Science, respectively.

Received for publication May 15, 1970. Accepted for publication June 15, 1970.