Spéciation et phytodisponibilité du nickel dans les sols

Abstract : This thesis relates to the study of parameters which influence the dynamic of nickel and its radionuclide 63 Ni in soils. At the Saille time, the study of the chemical and biological characteriza- tion of these elements availability in the soils is done. The available pool of Ni and 63 Ni (chemical estimation) was measured by chemical and isotopic methods and soil incubations; by evaluating the interest and limits of each roethod. The factors which influence the mobility of metal in soils were thus determined. With through this study, we showed that the bio- and phyto-availability of Ni depend on the soil mineralogy, on the soil weathering, on the type of metal associations with the mineraIs, and on the quantitative presence of these mineraIs. The transfer of Ni and 63 N i from the soil to the plant depends on the metal availability in the soil and on the roots behaviour to the soil offe1, in relation to the strategies of hyperaccumulation, accumulation or exclusion of N z. Plants are able to modify the metal availability in soils by influencing the sorption processes of Ni from the solid phase to the soil solution. They are also able to change the speciation of Ni in solution however the majority form of Ni in the soil solution was N i2+. Hyperaccumulators regulate Ni and 63 N i concentration in soil solution and their migration to the ground water. If the physico-chemical properties of soils, the pollutant availability and the choice of the hyperaccumulators are taken into account, the se plants are able to decrease and control durably the ecotoxicological effects of trace elements and radionuclides contamination in soils.
Document type :
Theses
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http://docnum.univ-lorraine.fr/prive/INPL_T_2004_MASSOURA_S.pdf
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Submitted on : Thursday, March 29, 2018 - 12:36:36 PM
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  • HAL Id : tel-01750047, version 1

Citation

Stamatia Massoura. Spéciation et phytodisponibilité du nickel dans les sols. Sciences agricoles. Institut National Polytechnique de Lorraine, 2004. Français. ⟨NNT : 2004INPL009N⟩. ⟨tel-01750047⟩

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