J. Phys. IV France
Volume 107, May 2003
Page(s) 1377 - 1380

J. Phys. IV France
107 (2003) 1377
DOI: 10.1051/jp4:20030558

Arsenic sorption onto disordered mackinawite as a control on the mobility of arsenic in the ambient sulphidic environment

M. 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 $_{\rm am}$) 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 $_{\rm am}$ in the aquifer sediment.

© EDP Sciences 2003