Restored Moulili riverbed impacted by manganese mining activity: potentially toxic metals enrichment factor and environmental risk (Moanda, Gabon)
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View abstract on PubMed
Summary
This summary is machine-generated.Physical restoration of the Moulili River in Gabon, impacted by 40 years of mining, did not fully eliminate metal enrichment. Further studies are needed to assess the long-term effectiveness of such environmental remediation efforts.
Area Of Science
- Environmental Science
- Geochemistry
- Ecotoxicology
Background
- Mining activities in tropical regions often lack initial environmental precautions, leading to river contamination and physical alterations.
- The Moulili River in Gabon has been affected by 40 years of mining, necessitating a study on its restoration process.
Purpose Of The Study
- To assess the effectiveness of physical restoration in mitigating metal contamination in a river system impacted by mining.
- To analyze the distribution and enrichment of metal elements in the sediments of the Moulili River.
Main Methods
- Analysis of metal elements (Mn, Fe, Co, Ni, Cu, Zn, Pb, Cr, Sn) in surface and deep sediments (40 cm).
- Calculation of enrichment factors (EFs) and environmental impact indices.
- Determination of abatement rates for specific metals along the river course.
Main Results
- While potentially toxic metal content was high, enrichment factors indicated no significant enrichment for Mn, Fe, Co, Ni, Cu, and Zn.
- Moderate enrichment was observed for lead (Pb), and significant enrichment for chromium (Cr) and tin (Sn).
- Tin showed the highest enrichment in samples from the washery, and enrichment levels varied with distance from the mining site.
Conclusions
- Physical restoration alone is insufficient to completely remove metal enrichment in mining-affected river systems.
- Environmental impact indices may not be suitable for areas with naturally metal-rich parent rock.
- Riverine suspended matter exhibits metal fractionation, indicating complex transfer processes affecting metal mobility.
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