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Fixation of Arsenical Herbicides, Phosphate, and Arsenate in Alluvial Soils¹

ABSTRACT

The sorption of arsenic (as arsenate), phosphate, DSMA (disodium methanearsonate) and the sodium salt of cacodylic acid (hydroxydimethylarsine oxide) by 16 Mississippi River alluvial flood plain soils was measured in a slurry experiment in which initial pH and solute molar solution concentrations for all four solutes were identical. Sorption of the two organoarsenical herbicides was strongly correlated with arsenate and phosphate sorption, and sorption of all four species was strongly correlated with clay and iron oxide contents of the soils. In 10^–3 to 10^–4M solution, the arsenicals are more strongly sorbed than phosphate with sorption increasing in the order P < cacodylate < arsenate methylarsonate.

Key Words: methanearsonate • cacodylic acid

¹ Contribution from the Southern Weed Science Lab., Agricultural Research Service, U. S. Dep. of Agric., Stoneville, MS 38776, in cooperation with the Mississippi Agric. and Forestry Exp. Sta.

² Research Chemist, S. Weed Sci. Lab.

Received for publication August 16, 1974.

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