Les métaux lourds dans les engrais phosphatés et les sulfates rejetés par les industries des fertilisants: Recherche sur leur transfert et leur mobilité dans les sols libanais

Abstract : To determine the impact and risk of chemical fertilizers, from their manufacture to their amendment, on soil contamination by trace metals, the study of their mobility and transfer would be necessary. The objective of this work was to evaluate the source of soil contamination by trace elements around the industry of chemical fertilizers, and to follow the temporal evolution of mobility and transfer of these elements in the profile of agricultural soil amended by superphosphate (SSP) fertilizers or phosphogypsum. To achieve our objective, we used techniques allowing the determination of structural and mineralogical characterization of collected soil samples, such as X-ray diffraction and electron microscopy. Chemical characterization related to the total concentration of trace and major elements of collected soils was established. As mobility was unstable over time, depending on several physico-chemical parameters such as pH, redox potential, and organic matter content, a sequential extraction was adopted throughout the study over time in the amended soil profile to a depth of 55 cm. In addition, the absorption of trace elements by agricultural crops cultivated over land amended with fertilizer or phosphogypsum was analyzed over time to assess the risk of their transfer to the food chain, especially the human food chain, imposing health hazards. A comparison between the effects of the application of phosphogypsum and phosphate fertilizer was carried out in concluding this work
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Lina Nafeh Kassir. Les métaux lourds dans les engrais phosphatés et les sulfates rejetés par les industries des fertilisants: Recherche sur leur transfert et leur mobilité dans les sols libanais. Agronomie. Université de Lorraine, 2012. Français. ⟨NNT : 2012LORR0332⟩. ⟨tel-01749899⟩

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