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Article Dans Une Revue Geochimica et Cosmochimica Acta Année : 2009

Role of natural nanoparticles on the speciation of Ni in andosols of la Reunion

Clément Levard
Emmanuel Doelsch
Jérôme Rose
Armand Masion
Olivier Proux
Daniel Borschneck
Jean-Yves Bottero

Résumé

Andosols on the island of Réunion have high nickel (Ni) concentrations due to the natural pedo-geochemical background. Enhanced knowledge of Ni speciation is necessary to predict the bioavailability and potential toxicity of this element. Ni speciation in these andosols, marked by the presence of high amounts of natural aluminosilicate nanoparticles, was investigated in two complementary systems: (i) In a soil sample--densimetric fractionation was first performed in order to separate the potential bearing phases, prior to Ni speciation characterization. (ii) In a synthetic sample--Ni reactivity with synthetic aluminosilicate nanoparticle analogs were studied. In both cases, Ni speciation was determined using X-ray absorption spectroscopy (XAS). The results revealed that Ni had the same local environment in both systems (natural and synthetic systems), and Ni was chemically linked to natural short-range ordered aluminosilicates or analogs. This complex represented about 75% of the total Ni in the studied soil.

Domaines

Minéralogie

Dates et versions

hal-00741166 , version 1 (11-10-2012)

Identifiants

Citer

Clément Levard, Emmanuel Doelsch, Jérôme Rose, Armand Masion, Isabelle Basile-Doelsch, et al.. Role of natural nanoparticles on the speciation of Ni in andosols of la Reunion. Geochimica et Cosmochimica Acta, 2009, 73 (16), pp.4750-4760. ⟨10.1016/j.gca.2009.05.053⟩. ⟨hal-00741166⟩
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