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Dissolution of Arsenic from Waterlogged and Aerated Soil¹

ABSTRACT

Sharpsburg and Menfro soils containing 320 and 160 µg As/g, respectively, were waterlogged with water or 1% dextrose. The Eh reached a minimum of –150 mV after 1 day of incubation and increased to about +300 mV after 12 days for both soils in 1% dextrose. The Eh remained constant in the Sharpsburg soil during incubation with water, but gradually decreased in the Menfro soil. In the 1% dextrose solution, As increased rapidly in both soils and became constant after 12 days. The As in solution increased more slowly when incubated with water, but also remained constant after 12 days. After freeze-drying and exposing the soil to the atmosphere, Eh increased and As decreased to initial levels.

The values of pAl + 3pOH, pAl + pAsO₄, pFe + 3pOH, pFe + pAsO₄, 3pMn + 2pAsO₄, 3pCa + 2pAsO₄, and 3pPb + 2pAsO₄ were computed. These measurements indicated that the soil solution of the Menfro and Sharpsburg soils contained less As than predicted for Al, Fe, and Ca arsenates, and more As than predicted for Mn and Pb arsenates.

¹ Contribution from the Missouri Agric. Exp. Stn. J. Ser. no. 7263. Approved by the Director. Supported by the Dep. of Interior, Off. of Water Resour., Project A-068-Missouri. Administered through the Missouri Resour. Center.

² Postgraduate Research Soil Scientist, Univ. of California, Riverside, CA 92502, and Professor of Agronomy, Univ. of Missouri, Columbia, MO 65201, respectively.

Received for publication August 25, 1976. Accepted for publication June 17, 1977.