Abstract
The degree of pyritization and degree of trace metal pyritization (DTMP) were investigated in sediments from Ghar El Melh Lagoon (northern Tunisia) in order to study metal deposition. A sediment core and 28 samples were thus taken in summer 2008, and metals and sulfate were analyzed in pore water/pyrite. Acid-volatile sulfide and metals were simultaneously extracted from these two fractions and the role of pyrite in the metal cycling studied. To examine pyrite presence and mineralogical form in sediments, X-ray diffraction of the washed and decarbonated sediment was performed along with scanning electron microscopy. Results showed that pyrite is present in fromboidal and euhedral forms. Thermodynamic calculation highlighted the formation of metallic sulfides and the co-precipitation of metals with iron sulfides. The DTMP increases with depth, indicating that these metals are either sequestered as sulfides or that they co-precipitate with pyrite into the deep sediment.
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Acknowledgements
This study was made possible by a Franco-Tunisian cooperation project (Chrono-Environment Laboratory, Besançon, France, UMR CNRS 6249; Laboratory of Mineral Resources and the Environment, Faculty of Sciences of Tunis, Tunisia). We would like to thank all concerned for their participation and contributions. We acknowledge the analytical support provided by the following laboratories: Laboratory of Mineral resources and Environment, Faculty of Sciences of Tunis; and Laboratory of Oceanography and Sedimentology, National Institute of Marine Sciences and Technology, Tunis. We especially thank Professor Gert De Lange of Utrecht University, Utrecht, Netherlands, whose fruitful discussions of our results were of great help. We express our appreciation to the editor, Dr. Philippe Garrigues, and to the anonymous reviewers for helping to improve our paper.
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Oueslati, W., Helali, M.A., Zaaboub, N. et al. Sulfide influence on metal behavior in a polluted southern Mediterranean lagoon: implications for management. Environ Sci Pollut Res 25, 2248–2264 (2018). https://doi.org/10.1007/s11356-017-0529-6
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DOI: https://doi.org/10.1007/s11356-017-0529-6