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Kinetics of Arsenite Sorption in Soils¹

ABSTRACT

The sorption of As(III) by 10 surface and subsurface horizons was investigated. An Elovich type equation and a modified Freundlich equation were used to describe the kinetics of the As(III) sorption process. Both equations successfully describe As(III) sorption rates. However, the modified Freundlich equation proved to be superior when both coefficients of determination (R²) and standard errors of estimate (SE) were considered. The SE values from the modified Freundlich equation were consistently lower than those from the Elovich equation. Modified Freundlich equation parameters were regressed against soil chemical and physical properties to indicate possible sorption mechanisms and to identify soil properties that could serve as predictors of arsenite sorption. The regression equations indicated that iron oxides and Eh were the main soil properties controlling arsenite sorption rate.

¹ Cooperative studies between the USDA-ARS, Appalachian Soil and Water Conservation Research Lab., Beckley, WV 25801, and West Virginia Univ. Agric. Exp. Stn., Morgantown, WV 25606.

² Graduate Research Assistant, Supervisory Soil Scientist, and Soil Scientist, respectively, USDA-ARS, Beckley, WV 25801.

Received for publication October 24, 1983. Accepted for publication February 3, 1984.

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