Li Y. T. auteur aut IRD Becquer Thierry auteur aut IRD Dai J. auteur aut IRD Quantin C. auteur aut IRD Benedetti M. F. auteur aut IRD text journalArticle eng text/pdf born digital access The oxidative dissolution of mine wastes gives rise to acidic, metal-enriched mine drainage (AMD) and has typically posed an additional risk to the environment. The poly-metallic mine Dabaoshan in South China is an excellent test site to understand the processes affecting the surrounding polluted agricultural fields. Our objectives were firstly to investigate metal ion activity in soil solution, distribution in solid constituents, and spatial distribution in samples, secondly to determine dominant environment factors controlling metal activity in the long-term AMD-polluted subtropical soils. Soil Column Donnan Membrane Technology (SC-DMT) combined with sequential extraction shows that unusually large proportion of the metal ions are present as free ion in the soil solutions. The narrow range of low pH values prevents any pH effects during the binding onto oxides or organic matter. The differences in speciation of the soil solutions may explain the different soil degradation observed between paddy and non-paddy soils. specialized Acid mine drainage Free ion Sorption Tropical soils Speciation 068 157 4 1249-1257 2009 0269-7491 https://www.documentation.ird.fr/hor/fdi:010044346 10.1016/j.envpol.2008.11.050 0269-7491 [F B010044346] https://www.documentation.ird.fr/hor/fdi:010044346 https://www.documentation.ird.fr/intranet/publi/2009/04/010044346.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2009-05-13 2017-08-23 fdi:010044346 fre