期刊名称：Research Journal of Environmental and Earth Sciences
印刷版ISSN：2041-0484
电子版ISSN：2041-0492
出版年度：2011
卷号：3
期号：5
页码：487-497
出版社：Maxwell Science Publications
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- 28500 μS/cm), total dissolved solids (9750-14180 mg/L), chlorine (5725.2-8277.6 mg/L) and total alkalinity (800-2000 mg/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 (71.8-1568 μg/g), lead (0.5-27.10 μg/g) and chromium (190-26328 μg/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 (Igeo). The EF and Igeo 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.
