Mn-oxide: a major source of easily mobilisable Co and Ni under reducing conditions in New Caledonia FerralsolsLes oxydes de Mn : une source majeure de Co et Ni facilement mobilisables en conditions réductrices dans les Ferralsols de Nouvelle-Calédonie |
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| Authors: | Cécile Quantin Thierry Becquer Jacques Berthelin |
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| Institution: | 1. Laboratoire des interactions micro-organismes–minéraux–matières organiques dans les sols (LiMos), FRE 2440 du CNRS, associée à l''université Henri-Poincaré, Nancy-1, 17, rue Notre-Dame-des-Pauvres, BP 5, 54501 Vandoeuvre-lès-Nancy cedex, France;2. IRD, c/o Laboratoire des interactions micro-organismes–minéraux–matières organiques dans les sols (LiMos), FRE 2440 du CNRS, associée à l''université Henri-Poincaré, Nancy-1, 17, rue Notre-Dame-des-Pauvres, BP 5, 54501 Vandoeuvre-lès-Nancy cedex, France |
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| Abstract: | Chemical and bacterial reduction and dissolution of Fe and Mn-oxide and the concomitant solubilisation of Co and Ni were studied in a surface horizon of a New-Caledonia Ferralsol. Chemical extractions showed that Mn and Co were in a large part associated in Mn-oxides. The main part of Ni was associated with goethite, but a very small fraction was also associated with Mn-oxides. Anaerobic reducing bacterial activity was responsible for Fe solubilisation at a smaller extent than for Mn solubilisation and consequently for associated metal release. Submicroscopic investigations revealed the presence of a Mn-oxide containing Co, Ni and Al, close to a lithiophorite–asbolane mixed-layers Mn-oxide, which can be considered as a main source of easily available metals in this soil. To cite this article: C. Quantin et al., C. R. Geoscience 334 (2002) 273–278. |
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| Keywords: | chemical and bacterial reduction Mn-oxide Fe-oxide Ferralsol TEM réduction chimique et bactérienne oxyde de Mn oxyde de Fe Ferralsol MET Géosciences de surface Pédologie Surface Geosciences Pedology |
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