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<dc:title xml:lang="fr">Phytoremédiation des sols pollués par les rejets de l’exploitation artisanale de l’or sous contexte sahélien</dc:title>
<dcterms:alternative xml:lang="en">Phytoremediation of soils polluted by artisanal gold mining waste in a sahelian context</dcterms:alternative>
<dc:subject xml:lang="fr">Phytoremédiation</dc:subject>
<dc:subject xml:lang="fr">Résidus miniers</dc:subject>
<dc:subject xml:lang="fr">Mobilité</dc:subject>
<dc:subject xml:lang="fr">Toxicité</dc:subject>
<dc:subject xml:lang="fr">Climat sahélien</dc:subject>
<dc:subject xml:lang="en">Phytoremediation</dc:subject>
<dc:subject xml:lang="en">Mining residues</dc:subject>
<dc:subject xml:lang="en">Mobility</dc:subject>
<dc:subject xml:lang="en">Toxicity</dc:subject>
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<dcterms:abstract xml:lang="fr">Cette étude évalue la dépollution des sols contaminés par les rejets de l’exploitation minière artisanale de l’or au Burkina Faso par phytoremédiation, avec Chrysopogon zizanioides et Andropogon gayanus. Les essais in situ menés ont montré une réduction des teneurs en As, Hg, Fe et Zn, associée à une amélioration de la structure du sol et une revégétalisation. En conditions ex situ (18 mois), C. zizanioides, atteint 38 % d’élimination du Fe et 68 % du Zn, avec une réduction globale du Zn d’environ 75 % contre 45 % pour A. gayanus. Les TF &gt; 1 pour le Zn indiquent une phytoextraction partielle chez C. zizanioides, tandis que A. gayanus agit surtout par phytostabilisation. Les analyses BCR confirment l’immobilisation du Fe (&gt; 80 % résiduel) et la diminution progressive de la mobilité du Zn. Ainsi, la co- culture optimise la phytoremédiation en contexte sahélien.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This study assesses the remediation of soils contaminated by artisanal gold mining residues in Burkina Faso using Chrysopogon zizanioides and Andropogon gayanus. In situ trials showed decreased As, Hg, Fe and Zn concentrations, improved soil structure, and progressive revegetation. Under controlled conditions (18 months), C. zizanioides achieved 38% Fe removal and 68% Zn removal, with an overall Zn reduction of 75% compared to 45% for A. gayanus. TF &gt; 1 for Zn indicates partial phytoextraction by vetiver, whereas A. gayanus acts mainly through phytostabilization. BCR analysis confirms Fe immobilization (&gt; 80% residual fraction) and a progressive decrease in Zn mobility. Co-cultivation enhances phytoremediation efficiency under Sahelian conditions.</dcterms:abstract>
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