Sources of very high heavy metal content in soils of volcanic island (La Réunion)

Doelsch Emmanuel, Saint Macary Hervé, Van de Kerchove Virginie. 2006. Sources of very high heavy metal content in soils of volcanic island (La Réunion). Journal of Geochemical Exploration, 88 (1-3) : 194-197. Symposium International sur la Géochimie de la Surface de la Terre. 7, Aix-en-Provence, France, 23 Août 2005/27 Août 2005.

Résumé : The objective of this study was to conduct an inventory of heavy metal concentrations (Cd, Cr, Cu, Hg, Ni, Pb and Zn) in the soils of La Réunion. 39 sampling sites were selected to cover the distribution of soils of the island. The results show that soils of La Réunion are rich in heavy metals: most of them exceed the French standard values beyond which sewage sludge spreading is not authorized. To identify the sources of heavy metals, we used: (i) the relationship between the heavy metal content in soils and the origin of the volcanic parent material; (ii) the comparison of heavy metal content between cultivated and uncultivated soils; and (iii) the heavy metal distribution in soil profiles. Cd and Pb evolution in soil profiles indicate an impact of human activities. High Hg concentrations in soils can be explained by the volcanic activity of the island. For Cr, Cu, Ni and Zn, we demonstrate that high concentrations in soils are mainly determined by the natural pedo-geochemical background.

Mots-clés Agrovoc : sol, métal lourd, contamination, zone volcanique, facteur lié au site

Mots-clés géographiques Agrovoc : La Réunion, France

Classification Agris : P33 - Chimie et physique du sol

Champ stratégique Cirad : Axe 6 (2005-2013) - Agriculture, environnement, nature et sociétés

Auteurs et affiliations

• Doelsch Emmanuel, CIRAD-CA-UPR Recyclage et risque (REU) ORCID: 0000-0002-7478-4296
• Saint Macary Hervé, CIRAD-CA-UPR Recyclage et risque (REU)
• Van de Kerchove Virginie, Chambre d'agriculture de la Réunion (REU)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/530862/)

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