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Article Dans Une Revue Open Journal of Soil Science Année : 2015

An integrated geochemical and mineralogical approach for the evaluation of Zn distribution in long-term sludge-amended soil

Dominique Proust
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Résumé

This research work was designed to compare the Zn distribution in a long-term sludge-amended soil with that in a control soil. Two complementary approaches were performed: (1) a geochemical approach at the metric scale of the bulk soil horizons and (2) a mineralogical approach at the micrometric scale of the primary minerals weathering microsites. The geochemical approach reveals that Zn in the control soil is inherited from the weathering parent-rock. Its concentration is always lower than in the amended soil where Zn is supplied at the surface by the spread sludges and moves downwards. The mineralogical approach shows that the clay minerals, produced by the weathering of the primary minerals (amphiboles and plagioclases), or filling the fissure network are made up of smectites (saponite and montmorillonite) at the bottom and kaolinite at the top of the two soil profiles. Each clay mineral, with its specific sorption capacity, controls the Zn distribution within the soil: the smectites produced by the amphiboles have high sorption capacity and favor Zn retention in the upper horizons of the soil. Conversely, the kaolinites produced by the plagioclases have lower sorption capacity, do not retain Zn in the surface horizons, and allow it to migrate to deeper horizons where it is sorbed onto the montmorillonites.
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Dates et versions

hal-01246266 , version 1 (04-01-2016)

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  • HAL Id : hal-01246266 , version 1

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Dominique Proust. An integrated geochemical and mineralogical approach for the evaluation of Zn distribution in long-term sludge-amended soil. Open Journal of Soil Science, 2015, 5, pp.251-265. ⟨hal-01246266⟩
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