Arsenite sorption in Spanish soils as affected by temperature

Abstract

Arsenite sorption was investigated in three Spanish soils. The form of the equilibrium curves of arsenite sorption confirmed that the isotherms of this process pertained to the L class of Giles classification. The curves corresponding to Soils 1 and 3 could be included in the subgroup 1 (monolayer coverage) and the curve of Soil 2 pertained to subgroup 4 (two centers of sorption). The Freundlich equation successfully described As(III) sorption over the entire As(III) concentration range in all the studied soils. Sorption of arsenite increased with increasing temperature; however, this increase was likely caused by an effect on the rate of the diffusion reaction that follows the adsorption process.

Notes

Present address: Wetland Biogeochemistry Institute, Louisiana State University, Baton Rouge, LA 70803–7511; e‐mail address: [email protected].