1. Laboratory of Physical Chemistry and Microbiology for the Environment, Nancy-University, CNRS, 405 rue de Vandoæeuvre, F-54600 Villers-lès-Nancy, France, Laboratory of Environment and Mineral Processing, Nancy-University, CNRS, Box 40, F-54501 Vandoeuvre-lès-Nancy Cedex, France and School of Chemistry and Department of Microbiology and Immunology, University of Melbourne, Victoria 3010, Australia