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  • 1
    Publication Date: 2019-04-15
    Description: The total concentration and the speciation of heavy metals (Pb, Cd, Cu, Zn, Ni, and Cr) in surface sediments of Rades-Hamam Lif coast were determined, with particular focus on the effect that urban and industrial waste in the Meliane river has on the estuary and coastal surface sediments of the Rades-Hamam Lif coast, off the Mediterranean Sea. Several geochemical indices were applied to assess the risk of contamination and the environmental risks of heavy metals on surface sediments. The total concentrations of these heavy metals are influenced by runoff, industrial, and urban wastewater. The Cd, Pb, Zn, and Ni are affected by anthropogenic sources, especially at the mouth of the Meliane river. The sequential extraction of Cd was presented dominantly in the exchangeable fraction and thus the high potential bioavailability. In contrast, Cr and Cu were mostly bound to the residual fraction indicating their low toxicity and bioavailability. The order of migration and transformation sequence was Cd 〉 Pb 〉 Ni 〉 Zn 〉 Cr 〉 Cu, and the degree of pollution was Cd 〉 Pb 〉 Ni 〉 Zn 〉 Cr 〉 Cu.
    Print ISSN: 2090-9063
    Electronic ISSN: 2090-9071
    Topics: Chemistry and Pharmacology
    Published by Hindawi
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  • 2
    Publication Date: 2022-12-27
    Description: La frange littorale Rades – Hammam lif est une zone côtière fortement urbanisée et industrialisée exposée depuis longtemps à la contamination par les polluants provenant essentiellement de l’oued Meliane qui constitue la voie principale de la pénétration des ETMs. Le mercure est un élément connu par sa toxicité, il se trouve naturellement sur la terre et aussi dans l’environnement à cause des activités anthropiques intenses. Le Golfe de Tunis est influencé par les apports des principaux cours d'eaux exoréiques, provenant de diverses sources de rejets d'origine domestique, industrielle et agricole. La partie sud-ouest du Golfe de Tunis, en particulier la frange littorale Rades - Hammam lif, subit depuis des années les apports des rejets provenant de l’oued Meliane. La concentration de mercure au niveau de l’oued Meliane s’échelonne de 0,02 à 0,61 (µg.g-1) et de 0,01 à 0,97 (µg.g-1) respectivement pendant la saison estivale et hivernale. Le facteur d’enrichissement indique un enrichissement modéré à extrêmement élevé d’où la pollution provient d’une origine anthropique. Le facteur de contamination montre une contamination considérable à très forte au niveau de l’oued Meliane et les stations du littoral. La répartition spatio-temporelle de Hg varie en fonction des sources de rejets installées sur la zone côtière et sur la bordure de l’oued Meliane ainsi que la direction de la dérive littorale au niveau de la côte.
    Description: The Rades - Hammam lif coast is a highly urbanized and industrialized area exposed for a long time to the contamination by pollutants coming essentially from the Meliane River which constitutes the main source of trace metals.Mercury is an element known for his toxicity, it is found naturally on earth and also in the environment due to intense human activities. The Gulf of Tunis is influenced by the contributions of the main exoreic rivers, coming from various sources of domestic, industrial and agricultural discharges. The southwestern part of the Gulf of Tunis, in particular the Rades - Hammam lif coastal fringe, has for years been subjected to the influx of discharges from the oued Meliane. The mercury concentration at the level of the oued Meliane ranges from 0.02 to 0.61 (µg.g-1) and from 0.01 to 0.97 (µg.g-1) respectively during the summer season and winter. The enrichment factor indicates moderate to extremely high enrichment where the pollution is of anthropogenic origin. The contamination factor shows considerable to very strong contamination at the level of the Meliane oued and the coastal stations. The spatio-temporal distribution of Hg varies according to the sources of releases installed on the coastal zone and on the edge of the oued Meliane as well as the direction of the littoral drift at the level of the coast..
    Description: Published
    Description: Refereed
    Keywords: Mercure ; Sédiments de surface ; pollution ; contamination
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: 139-147
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