M. J. Avena, L. K. Koopal, and W. H. Van-riemsdijk, Proton Binding to Humic Acids: Electrostatic and Intrinsic Interactions, Journal of Colloid and Interface Science, vol.217, issue.1, pp.37-48, 1999.
DOI : 10.1006/jcis.1999.6317

M. Bau, Scavenging of dissolved yttrium and rare earths by precipitating iron oxyhydroxide: experimental evidence for Ce oxidation, Y-Ho fractionation, and lanthanide tetrad effect, Geochimica et Cosmochimica Acta, vol.63, issue.1, pp.67-77, 1999.
DOI : 10.1016/S0016-7037(99)00014-9

J. J. Braun, M. Pagel, J. P. Muller, P. Bilong, A. Michard et al., Cerium anomalies in lateritic profiles, Geochimica et Cosmochimica Acta, vol.54, issue.3, pp.781-795, 1990.
DOI : 10.1016/0016-7037(90)90373-S

J. J. Braun, J. Viers, B. Dupré, M. Polvé, J. Ndam et al., Solid/Liquid REE Fractionation in the Lateritic System of Goyoum, East Cameroon: The Implication for the Present Dynamics of the Soil Covers of the Humid Tropical Regions, Geochimica et Cosmochimica Acta, vol.62, issue.2, pp.273-299, 1998.
DOI : 10.1016/S0016-7037(97)00344-X

M. Davranche, O. Pourret, G. Gruau, and A. Dia, Impact of humate complexation on the adsorption of REE onto Fe oxyhydroxide, Journal of Colloid and Interface Science, vol.277, issue.2, pp.271-279, 2004.
DOI : 10.1016/j.jcis.2004.04.007

M. Davranche, O. Pourret, G. Gruau, A. Dia, L. Coz-bouhnik et al., Adsorption of REE(III)-humate complexes onto MnO2: Experimental evidence for cerium anomaly and lanthanide tetrad effect suppression, Geochimica et Cosmochimica Acta, vol.69, issue.20, pp.4825-4835, 2005.
DOI : 10.1016/j.gca.2005.06.005

M. Davranche, O. Pourret, G. Gruau, A. Dia, D. Jin et al., Competitive binding of REE to humic acid and manganese oxide: Impact of reaction kinetics on development of cerium anomaly and REE adsorption, Chemical Geology, vol.247, issue.1-2, pp.154-170, 2008.
DOI : 10.1016/j.chemgeo.2007.10.010

URL : https://hal.archives-ouvertes.fr/insu-00261011

D. Baar, H. J. Bacon, M. P. Brewer, P. G. Bruland, and K. W. , Rare earth elements in the Pacific and Atlantic Oceans, Geochimica et Cosmochimica Acta, vol.49, issue.9, pp.1943-1959, 1985.
DOI : 10.1016/0016-7037(85)90089-4

D. Baar, H. J. German, C. R. Elderfield, H. Van-gaans, and P. , Rare earth element distributions in anoxic waters of the Cariaco Trench, Geochimica et Cosmochimica Acta, vol.52, issue.5, pp.1203-1219, 1988.
DOI : 10.1016/0016-7037(88)90275-X

D. Carlo, E. H. Mcmurtry, and G. M. , Rare-earth element geochemistry of ferromanganese crusts from the Hawaiian Archipelago, central Pacific, Chemical Geology, vol.95, issue.3-4, pp.235-250, 1992.
DOI : 10.1016/0009-2541(92)90014-V

D. Carlo, E. H. Wen, X. Irving, and M. , The influence of redox reactions on the uptake of dissolved Ce by suspended Fe and Mn oxide particles, Aquatic Geochemistry, vol.3, issue.4, pp.357-389, 1998.
DOI : 10.1023/A:1009664626181

A. Dia, G. Gruau, G. Olivié-lauquet, C. Riou, J. Molénat et al., The distribution of rare earth elements in groundwaters: assessing the role of source-rock composition, redox changes and colloidal particles, Geochimica et Cosmochimica Acta, vol.64, issue.24, pp.4131-4151, 2000.
DOI : 10.1016/S0016-7037(00)00494-4

J. Dole?al and J. Novák, Beitrag zum polarographischen verhalten von drei- und vierwertigem cer, Collection of Czechoslovak Chemical Communications, vol.24, issue.7, pp.2182-2189, 1959.
DOI : 10.1135/cccc19592182

J. L. Domagalski, W. H. Orem, and H. P. Eugster, Organic geochemistry and brine composition in Great Salt, Mono, and Walker Lakes, Geochimica et Cosmochimica Acta, vol.53, issue.11, pp.2857-2872, 1989.
DOI : 10.1016/0016-7037(89)90163-4

H. Elderfield, The oceanic chemistry of the rare earth elements in seawater, pp.105-126, 1988.

H. Elderfield and M. J. Greaves, The rare earth elements in seawater, Nature, vol.36, issue.5854, pp.214-219, 1982.
DOI : 10.1038/296214a0

H. Elderfield, C. J. Hawkesworth, M. J. Greaves, and S. E. Calvert, Rare earth element geochemistry of oceanic ferromanganese nodules and associated sediments, Geochimica et Cosmochimica Acta, vol.45, issue.4, pp.513-528, 1981.
DOI : 10.1016/0016-7037(81)90184-8

C. R. German, B. P. Holiday, and H. Elderfield, Redox cycling of rare earth elements in the suboxic zone of the Black Sea, Geochimica et Cosmochimica Acta, vol.55, issue.12, pp.3553-3558, 1991.
DOI : 10.1016/0016-7037(91)90055-A

C. R. German, T. Masuzawa, M. J. Greaves, H. Elderfield, and J. M. Edmond, Dissolved rare earth elements in the Southern Ocean: Cerium oxidation and the influence of hydrography, Geochimica et Cosmochimica Acta, vol.59, issue.8, pp.1551-1558, 1995.
DOI : 10.1016/0016-7037(95)00061-4

G. Gruau, A. Dia, G. Olivié-lauquet, M. Davranche, and G. Pinay, Controls on the distribution of rare earth elements in shallow groundwaters, Water Research, vol.38, issue.16, pp.3576-3586, 2004.
DOI : 10.1016/j.watres.2004.04.056

J. Hoyle, H. Elderfield, A. Gledhill, and M. Greaves, The behaviour of the rare earth elements during mixing of river and sea waters, Geochimica et Cosmochimica Acta, vol.48, issue.1, pp.143-149, 1984.
DOI : 10.1016/0016-7037(84)90356-9

K. H. Johannesson, W. B. Lyons, and D. A. Bird, Rare earth element concentrations and speciation in alkaline lakes from the western U.S.A., Geophysical Research Letters, vol.82, issue.9, pp.773-774, 1994.
DOI : 10.1029/94GL00005

K. H. Johannesson and W. B. Lyons, The rare earth element geochemistry of Mono Lake water and the importance of carbonate complexing, Limnology and Oceanography, vol.39, issue.5, pp.1141-1154, 1994.
DOI : 10.4319/lo.1994.39.5.1141

D. Koeppenkastrop, D. Carlo, and E. H. , Sorption of rare-earth elements from seawater onto synthetic mineral particles: An experimental approach, Chemical Geology, vol.95, issue.3-4, pp.251-263, 1992.
DOI : 10.1016/0009-2541(92)90015-W

M. G. Lawrence and B. S. Kamber, The behaviour of the rare earth elements during estuarine mixing???revisited, Marine Chemistry, vol.100, issue.1-2, pp.147-161, 2006.
DOI : 10.1016/j.marchem.2005.11.007

M. I. Leybourne, W. D. Goodfellow, D. R. Boyle, and G. M. Hall, Rapid development of negative Ce anomalies in surface waters and contrasting REE patterns in groundwaters associated with Zn???Pb massive sulphide deposits, Applied Geochemistry, vol.15, issue.6, pp.695-723, 2000.
DOI : 10.1016/S0883-2927(99)00096-7

Y. Luo and R. H. Byrne, Carbonate complexation of yttrium and the rare earth elements in natural waters, Geochimica et Cosmochimica Acta, vol.68, issue.4, pp.691-699, 2004.
DOI : 10.1016/S0016-7037(03)00495-2

C. J. Milne, D. G. Kinniburgh, and E. Tipping, Generic NICA-Donnan Model Parameters for Proton Binding by Humic Substances, Environmental Science & Technology, vol.35, issue.10, pp.2049-2059, 2001.
DOI : 10.1021/es000123j

J. W. Moffett, Microbially mediated cerium oxidation in sea water, Nature, vol.345, issue.6274, pp.421-423, 1990.
DOI : 10.1038/345421a0

J. W. Moffett, A radiotracer study of cerium and manganese uptake onto suspended particles in Chesapeake Bay, Geochimica et Cosmochimica Acta, vol.58, issue.2, pp.695-703, 1994.
DOI : 10.1016/0016-7037(94)90499-5

P. Möller and M. Bau, Rare-earth patterns with positive cerium anomaly in alkaline waters from Lake Van, Turkey. Earth and Planetary Sciences Letters, pp.671-676, 1993.

K. L. Nash and J. C. Sullivan, Kinetics of complexation and redox reactions of the lanthanides in aqueous solutions, Handbook on the Physics and Chemistry of Rare Earths, pp.347-391, 1991.

A. Ohta and I. Kawabe, REE(III) adsorption onto Mn dioxide (??-MnO2) and Fe oxyhydroxide: Ce(III) oxidation by ??-MnO2, Geochimica et Cosmochimica Acta, vol.65, issue.5, pp.695-703, 2001.
DOI : 10.1016/S0016-7037(00)00578-0

D. Z. Piper, Rare earth elements in ferromanganese nodules and other marine phases, Geochimica et Cosmochimica Acta, vol.38, issue.7, pp.1007-1022, 1974.
DOI : 10.1016/0016-7037(74)90002-7

O. Pourret, M. Davranche, G. Gruau, and A. Dia, Competition between humic acid and carbonates for rare earth elements complexation, Journal of Colloid and Interface Science, vol.305, issue.1, pp.25-31, 2007.
DOI : 10.1016/j.jcis.2006.09.020

URL : https://hal.archives-ouvertes.fr/insu-00154696

O. Pourret, M. Davranche, G. Gruau, and A. Dia, Rare earth elements complexation with humic acid, Chemical Geology, vol.243, issue.1-2, pp.128-141, 2007.
DOI : 10.1016/j.chemgeo.2007.05.018

URL : https://hal.archives-ouvertes.fr/insu-00180039

C. Riglet-martial, P. Vitorge, and V. Calmon, Electrochemical Characterisation of the Ce(IV) Limiting Carbonate Complex, Radiochimica Acta, vol.82, issue.s1, pp.69-76, 1998.
DOI : 10.1524/ract.1998.82.special-issue.69

E. R. Sholkovitz, The aquatic chemistry of rare earth elements in rivers and estuaries, Aquatic Geochemistry, vol.51, issue.7, pp.1-34, 1995.
DOI : 10.1007/BF01025229

P. L. Smedley, The geochemistry of rare earth elements in groundwater from the Carnmenellis area, southwest England, Geochimica et Cosmochimica Acta, vol.55, issue.10, pp.2767-2779, 1991.
DOI : 10.1016/0016-7037(91)90443-9

J. E. Sonke and V. J. Salters, Lanthanide???humic substances complexation. I. Experimental evidence for a lanthanide contraction effect, Geochimica et Cosmochimica Acta, vol.70, issue.6, pp.1495-1506, 2006.
DOI : 10.1016/j.gca.2005.11.017

URL : https://hal.archives-ouvertes.fr/hal-00319467

W. Stumm and J. J. Morgan, Aquatic Chemistry, 1996.

Y. Takahashi, H. Shimizu, A. Usui, H. Kagi, and M. Nomura, Direct observation of tetravalent cerium in ferromanganese nodules and crusts by X-ray-absorption near-edge structure (XANES), Geochimica et Cosmochimica Acta, vol.64, issue.17, pp.2929-2935, 2000.
DOI : 10.1016/S0016-7037(00)00403-8

J. Tang and K. H. Johannesson, Speciation of rare earth elements in natural terrestrial waters: assessing the role of dissolved organic matter from the modeling approach, Geochimica et Cosmochimica Acta, vol.67, issue.13, pp.2321-2339, 2003.
DOI : 10.1016/S0016-7037(02)01413-8

E. Tipping, Modeling the competition between alkaline earth cations and trace metal species for binding by humic substances, Environmental Science & Technology, vol.27, issue.3, pp.520-529, 1993.
DOI : 10.1021/es00040a011

E. Tipping, Humic Ion-Binding Model VI: an improved description of the interactions of protons and metal ions with humic substances, Aquatic Geochemistry, vol.4, issue.1, pp.3-48, 1998.
DOI : 10.1023/A:1009627214459

A. W. Vermeer, W. H. Van-riemsdijk, and L. K. Koopal, Adsorption of Humic Acid to Mineral Particles. 1. Specific and Electrostatic Interactions, Langmuir, vol.14, issue.10, pp.2810-2819, 1998.
DOI : 10.1021/la970624r

J. Viers, B. Dupré, M. Polvé, J. Schott, J. Dandurand et al., Chemical weathering in the drainage basin of a tropical watershed (Nsimi-Zoetele site, Cameroon) : comparison between organic-poor and organic-rich waters, Chemical Geology, vol.140, issue.3-4, pp.181-206, 1997.
DOI : 10.1016/S0009-2541(97)00048-X

. Alkalinity, 10 -3 mol L -1 pH 6

A. Appendix, Proportion (%) of Ln species in the ultrafiltrate

. Alkalinity, 10 -3 mol L -1 pH 6

B. Appendix, Proportion (%) of Ln species in the retentate