dc.contributor.author | Kishe, MA | |
dc.contributor.author | Machiwa, JF | |
dc.date.accessioned | 2015-11-10T09:37:56Z | |
dc.date.available | 2015-11-10T09:37:56Z | |
dc.date.issued | 2004 | |
dc.identifier.citation | Distribution of Heavy Metals In Sediments of Mwanza Gulf of Lake Victoria, Tanzania Kishe, M.A.1 and Machiwa, J.F.2 1Tanzania Fisheries Research Institute, P.O.Box 475, Mwanza, Tanzania 2Department of Zoology and Marine Biology, University of Dar es Salaam, P. O. Box 35064, Dar es Salaam, Tanzania | en_US |
dc.identifier.uri | http://hdl.handle.net/11671/747 | |
dc.description.abstract | A study was conducted in February - April 2000 with the aim of determination of heavy metal
concentrations in lake sediment at areas, which were considered as point- and non-point sources. A trend of
heavy metal variation in sediment with increasing distance towards the lake from the point- and non-point
sources was also investigated. Samples were analyzed for Cd, Cr, Cu, Pb, Hg and Zn by AAS. The highest
concentrations (ppm) for Cu (26.1 ± 4.8), Hg (0.2 ± 0.05), Pb (30.7 ± 5.6) and Zn (45.4 ± 13.1) were found
at approximately 25 m from the shoreline. Generally, heavy metals concentration in the sediment decreased
with increasing distance from the point sources towards the lake except for Cd and Cr whose highest
concentrations were found at approximately 2000 m from the shoreline.
Sediment samples which were collected at the shores within the urban area of Mwanza showed elevated
levels of Pb (54.6 ± 11.1 ppm) and Zn (83.7 ± 21.5 ppm). However, the highest concentrations of Cd (7.0 ±
0.2 ppm), Cr (12. 9 ± 1.0 ppm) and Hg (2.8 ± 0.8 ppm) were recorded at sampling stations, which were
adjacent to river mouths. In this study, it was concluded that, urban areas contain high levels of heavy
metals due to pollution generating activities, which are taking place in these areas. However, more
researches on factors influencing the accumulation of heavy metals in the aquatic systems including the
chemical make-up of the sampling stations are emphasized | en_US |
dc.language.iso | en | en_US |
dc.publisher | Lake Victoria Environmental Management Project (LVEMP) | en_US |
dc.subject | Sediment | en_US |
dc.subject | Heavy metals | en_US |
dc.subject | Mwanza Gulf | en_US |
dc.subject | Lake Victoria | en_US |
dc.subject | Tanzania | en_US |
dc.title | Distribution of Heavy Metals In Sediments of Mwanza Gulf of Lake Victoria, Tanzania | en_US |
dc.type | Article | en_US |