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- W2550140500 abstract "Okpara dam supplies the drinking water treatment station of Parakoutown. Aquatic plants proliferation and chemical stratification of thewater column in this reserve let see clear manifestation ofeutrophication process. Phosphorus concentration in sediments wasestimated in the range of 13.479 mg/g to 35.46 mg/g dry wet ofsediment. These values are high and not common in the literature. Themeasured Phosphorus and a-chlorophyll values in the water column showhyper-eutrophication. From N/P ratio, Nitrogen is the limiting factorof eutrophication in Okpara dam, but this does not stop eutrophication.Phosphorus fractionation according to Rydin and Welch (1998) under oxicconditions for surface results sediment and under profile sediment wasstudied. It was demonstrated that: Fe-bound-P, Al-bound-P andOrganic-bound-P comprise the largest phosphorus pool (30% to 51% ofTotal Phosphorus). High soluble reactive phosphorus content wasmeasured in sediment column compared to other study cases. Organicphosphorus fraction represents 90% of the Total Extracted Phosphoruscontent. Water and sediment column acidity could allowed iron and humicacids production from the high organic matter amount (21.42% to 28.30%)in the dam to modulate P releasing from sediment. Phosphorus short termremobilization study lets know that deeper sediment organic matters aremore mineralized and released more phosphorus (95%) than surfacesediment (20%). This fact is not suitable for sediment dredging to1metter deeper because of eutrophication resumption. In oxic mediumaluminum and iron orthophosphate are precipitated more in acidicsolution. Phosphorus constitutes iron mobility factor in the dam." @default.
- W2550140500 created "2016-11-30" @default.
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- W2550140500 date "2014-01-16" @default.
- W2550140500 modified "2023-09-27" @default.
- W2550140500 title "Eutrophication, sediment Phosphorus fractionation and short-termmobility study in the surface and under profile sediment of a waterdam. (Okpara dam, Benin, West Africa)." @default.
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