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What the Orne River tells about the former steelmaking activities : chemical and mineralogical investigations on sediments

Abstract : The Orne River is a tributary of the Moselle River, located northeastern France. During the last two centuries, the Orne watershed was highly industrialized. The introduction of wastes or by-products into the river is highly anticipated. Based on industrial needs, some small dams were built. However, the Directive 2000/60/EC of the European parliament strongly incite the removal of engineered structures (such as dams). This raises the question about the fate of contaminated sediment remobilization. The aims of this work are to identify the different sediment deposits along the Orne River. Surface sediments and sediment cores were collected along the Orne River. The sediments were then analyzed for water content, grain size distribution, pH, major and trace chemical composition using ICP-OES and ICP-MS, respectively, major crystalline minerals (XRD), micrometric (light microscope and SEM) and sub-micrometric (TEM) mineralogy, and Zn speciation at a molecular level (XANES). The chemical and mineralogical composition of the surface sediments revealed lithogenic as well as anthropogenic contributions. Interestingly, the sediment layers of the core collected upstream of the Beth dam showed fingerprints of the former steelmaking facilities. Those deposits were highly enriched in Fe, Zn and Pb, and were fingerprinted by crystalline iron minerals, and by newly formed Fe-aluminosilicates. TEM-EDXS and XANES at the Zn K-edge observations evidenced that Zn was mainly carried as sulfides, and to a lesser extent associated to Fe oxy-hydroxides and Fe-aluminosilicates. The remobilization of the contaminated sediments can then be traced by the unique mineralogical composition
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Submitted on : Thursday, July 12, 2018 - 9:36:08 AM
Last modification on : Wednesday, October 14, 2020 - 4:05:45 AM
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  • HAL Id : tel-01761640, version 1

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Hussein Kanbar. What the Orne River tells about the former steelmaking activities : chemical and mineralogical investigations on sediments. Geochemistry. Université de Lorraine; Université libanaise, 2017. English. ⟨NNT : 2017LORR0118⟩. ⟨tel-01761640⟩

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