Quantin C. auteur aut IRD Becquer Thierry auteur aut IRD Rouiller J.H. auteur aut IRD Berthelin J. auteur aut IRD text journalArticle eng text/pdf reformatted digital access Bacterial reduction of Fe- and Mn-oxides was studied in a surface horizon of a New Caledonian Ferralsol in batch experiments. Two treatments were imposed containing different sources of organic matter (soil organic matter with or without glucose addition) to link organic matter biodegradation with reduction process. The concomitant solubilization of Ni and Co was also studied. Results showed that anaerobic Fe- and Mn-reducing bacterial activity was responsible for Fe- and Mn-oxide solubilization by anaerobic respiration or fermentation. When C was more available, oxide reduction was enhanced. Mn-oxide appeared as the major reducible phase and metal source rather than goethite. Co and Ni were solubilized with Fe and Mn but their amounts in solution decreased at the end of experiment. The bioavailability of heavy metals in this soil was increased by biological reduction but was limited by adsorption or precipitation phenomena. (Résumé d'auteur) specialized DEGRADATION DU SOL ALTERATION METAL LOURD ELEMENT EN TRACE NICKEL COBALT OXYDE FER MANGANESE REDUCTION CHIMIQUE BACTERIE MATIERE ORGANIQUE CARBONE ORGANIQUE MINERALISATION ETUDE EXPERIMENTALE NOUVELLE CALEDONIE 074SOLMIC 068PROSOL 53 323-340 2001 0168-2563 https://www.documentation.ird.fr/hor/fdi:010025443 10.1023/A:1010680531328 0168-2563 [F B010025443] https://www.documentation.ird.fr/hor/fdi:010025443 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_7/b_fdi_57-58/010025443.pdf IRD - Base Horizon / Pleins textes 2001-06-27 2021-05-20 fdi:010025443 fre