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Arsenite Sorption and Desorption in Soils¹

ABSTRACT

A linear form of the Freundlich isotherm was used to describe arsenite [As(III)] sorption by the A and B horizons of five West Virginia soils. Arsenite sorption conformed to the Freundlich isotherm over the entire concentration range for all the soils. Simple correlation coefficients and multiple regression equations were used to relate soil properties to parameters of the Freundlich equation. Iron oxide percentage and pH were the soil properties most closely related to parameters of As(III) sorption. The rate of As(III) sorption by the A and B horizons of an Upshur soil was rapid initially and decreased with time. A modified form of the Freundlich equation was used to explain the As(III) sorption rate data. Arsenite sorption was not reversible; only a small amount of the sorbed As(III) was released after five desorption steps. The modified Freundlich equation was also used to describe As(III) desorption rate. Simple and multiple regression calculations indicated that iron oxides and pH were correlated with the rate of As(III) desorption by the investigated soils.

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. Senior Author is currently Assistant Professor, Dep. of Soil and Water, Alexandria Univ., Alexandria, Egypt.

Received for publication April 15, 1983. Accepted for publication April 3, 1984.

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