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Article Dans Une Revue Journal of Soils and Sediments Année : 2008

Contribution of technic materials to the mobile fraction of metals in urban soils in Marrakech (Morocco)

Résumé

In urban areas, soils are often dramatically altered by anthropogenic activity and these modifications distinguish these soils (Anthrosols, Technosols) from those in natural systems. In urban environments, they receive considerable pollution from industry, traffic and refuse. Since contaminated soil particles can be easily inhaled or ingested, there is a potential transfer of toxic pollutants to humans. Risk assessment is essentially based on the determination of the total or mobile contents of pollutants in soils using chemical extractions. This approach could be improved by taking into consideration the bioavailable fractions of these toxic elements as measured by biotests. The coarse soil fraction usually neglected in analyses can nevertheless have an effect on the concentration of metals in the soil solution. This coarse fraction is made up of the natural materials and of technic materials constituting anthropogenic soils (plastic, paper, fabric, wood, bones, metallic elements and building materials). These materials have variable capacities to release or adsorb trace elements. Samples representative of different technic fraction components of Marrakech urban soils permit one to quantify their contribution to the enrichment of the soluble metal concentrations. Works are carried out to achieve partial extractions of metals from the three fractions (less than 2 mm, coarse natural and coarse technic) of selected urban soils in order to determine their contribution to the metal contamination of soils.

Dates et versions

hal-01486307 , version 1 (09-03-2017)

Identifiants

Citer

Hicham El Khalil, Christophe Schwartz, Ouafae Elhamiani, Jochen Kubiniok, Jean-Louis Morel, et al.. Contribution of technic materials to the mobile fraction of metals in urban soils in Marrakech (Morocco). Journal of Soils and Sediments, 2008, 8 (1), pp.17-22. ⟨10.1065/jss2008.01.269⟩. ⟨hal-01486307⟩
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