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Water Quality and Level of Some Heavy Metals in Water and Sediments of Kpeshie Lagoon, La-Accra, Ghana
並列摘要
The water quality and levels of some trace metals in water and sediments of the Kpeshie Lagoon located in Accra, Ghana were studied in March, 2009. Water and sediment samples of the lagoon were analyzed for various parameters. The water quality parameters included pH, temperature, conductivity, Total Dissolved Solids (TDS), salinity, Dissolved Oxygen (DO), and nutrients. The results showed that conductivity (19370-28500μS/cm), total dissolved solids (9750-14180mg/L), chlorine (5725.2-8277.6mg/L) and total alkalinity (800-2000mg/L) were at an intermediate state between fresh and saline waters. However, the studied nutrients contents of the water were at levels within regulatory limits for natural waters. The heavy metals in the sediment especially nickel (71.8-1568μg/g), lead (0.5-27.10μg/g) and chromium (190-26328μg/g) was adjudged a potential health risk to humans and the aquatic life of the lagoon's ecosystem. The contamination status of the sediment's heavy metals was confirmed on the basis of Enrichment Factor (EF) and geoaccumulation index (I_geo). The EF and I_geo results supported the fact that the sediments were highly enriched with Ni, and Cr and to a lesser extent Pb. The sediment was found to be practically unpolluted with Zn and that the source of contamination was natural.
延伸閱讀
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