[1] Univ Montpellier I, CNRS, UMR 5569, IRD,Lab Hydrosci, F-34095 Montpellier, France
[2] Univ Montpellier 2, CCMSE, F-34095 Montpellier, France
[3] Univ Paris 07, Lab Geochim Eaux, F-75251 Paris, France
[4] CNRS, UMR 7047, IPGP, F-75251 Paris, France
[5] Univ Bordeaux 1, CNRS, UMR 5805, EPOC, F-33405 Talence, France
[6] Univ Aix Marseille, CNRS, UMR 6635, CEREGE, F-13545 Aix En Provence, France