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Chemical Distribution and Gaseous Evolution of Arsenic-74 Added to Soils as DSMA-⁷⁴As¹

ABSTRACT

Gaseous evolution of ⁷⁴ As from a soil treated with arsenic-74 labeled disodium methanearsonate (DSMA-⁷⁴ As) at 100 µg/g was a function of organic matter addition and moisture conditions. Loss of ⁷⁴As was greatest from soils that received an exogenous carbon source and were maintained under wet conditions.

Arsenic-74 sorbed by soils of pH 4, 6, and 8 was fractionated by a differential dissolution procedure commonly used for phosphorus. Iron arsenate (soluble in 0.1N NaOH) was the most abundant form followed by aluminum arsenate (soluble in 0.5N NH₄F). The soils generally contained more aluminum arsenate at pH 4 than at pH 6 or 8. Calcium arsenate fractions (soluble in 0.5N H₂SO₄) were usually higher at pH 6 and 8 than at pH 4. Water-soluble forms and nonextractable forms were inversely proportional to each other.

¹ Contribution from Department of Plant & Soil Science, University of Tennessee Agric. Exp. Stn., Knoxville. Presented before Div. S-2, Soil Science Society of America, Chicago, Ill., 15 Nov. 1974.

² Graduate Research Assistant and Associate Professor, respectively. Part of the work submitted as a M.S. thesis by the senior author.

Received for publication August 1, 1975. Accepted for publication June 3, 1976.