%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Massoura, S. T.
%A Echevarria, G.
%A Becquer, Thierry
%A Ghanbaja, J.
%A Leclere Cessac, E.
%A Morel, J. L.
%T Control of nickel availability by nickel bearing minerals in natural and anthropogenic soils
%D 2006
%L fdi:010037738
%G ENG
%J Geoderma
%@ 0016-7061
%K nickel ; soil ; speciation ; weathering ; availability ; soil contamination
%M CC:0002428375-0004
%N 1-2
%P 28-37
%R 10.1016/j.geoderma.2006.01.008
%U https://www.documentation.ird.fr/hor/fdi:010037738
%> https://www.documentation.ird.fr/intranet/publi/2007/01/010037738.pdf
%V 136
%W Horizon (IRD)
%X The aim of this paper was i) to determine the Ni-bearing minerals and localize Ni in natural and contaminated Ni-rich soils, ii) to characterize Ni availability with isotopic exchange kinetics (IEK) and iii) to study its interactions with soil mineralogy and characteristics along a gradient of weathering intensity. We sampled 16 soils varying from a recently exposed surface serpentinite in cold regions, to Ferralsols (laterites) from a humid tropical climate including two highly contaminated soils (Ni industry). The minerals identified ranged from primary minerals to secondary phyllosilicates and lastly to Mn/Fe oxides, according to weathering intensity. Primary minerals inherited from the parent materials and secondary phyllosilicates formed in low leaching conditions had concentrations of Ni similar to the rock (0.2-0.3%). When compared to other secondary minerals, Fe oxides displayed slight Ni enrichment in moderate leaching conditions (0.4-0.8%) up to 10-fold enrichment in highly weathered Ferralsols (4-6%). Full characterization of the three factors of Ni availability in soils: the intensity (C-Ni), the quantity (E-t) and the capacity (CF) factors was achieved with IEK. For most of the soils, C-Ni and E-t varied conjointly: elevated values of these two parameters were found in soils dominated by both phyllosilicates and amorphous Fe oxides (high exchange capacity); low values were found in soils with significant amounts of well-crystallized Fe oxides (high retention capacity). In the case of anthropogenic origin, control of soil Ni availability also depends on the type of Ni-bearing minerals.
%$ 068