1. NSERC Industrial Chair on Drinking Water, Department of Civil, Mining and Geological Engineering, École Polytechnique de Montréal, NSERC-Industrial Chair in Drinking Water, C.P. 6079, Succursale Centre-Ville, Montréal, QC, Canada H3C 3A7
2. Écologie des Systèmes Aquatiques, Université Libre de Bruxelles, Campus de la Plaine, CP 221, Boulevard du Triomphe, B-1050 Brussels, Belgium
3. Permanent address: Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Hidalgo, Carr. Pachuca-Tulancingo km. 4.5, 42184 Mineral de la Reforma, Hgo., Mexico