J. Phys. IV France 107 (2003) 1377
Arsenic sorption onto disordered mackinawite as a control on the mobility of arsenic in the ambient sulphidic environmentM. Wolthers1, L. Charlet2 and C. H. van der Weijden1
1 Department of Geochemistry, Faculty of Earth Sciences, Utrecht University, P.O. Box 80021, 3508 Utrecht, The Netherlands
2 OSUG, Université Grenoble 1, CNRS, LGIT, BP. 53, 38041 Grenoble cedex 9, France
Arsenate, As (V), sorption onto synthetic disordered mackinawite (FeS ) follows Langmuir-type behaviour. As (V) is not reduced prior to or during sorption. Arsenite, As(III) sorption can be expressed by a Freundlich isotherm. Comparison of the experimental sorption isotherms to field data describing the mobility of arsenic in a Bangladesh aquifer shows that arsenic mobility may be controlled by As(V) sorption onto FeS in the aquifer sediment.
© EDP Sciences 2003