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Concentrations of Metals in River Sediment and Wetland Vegetations in Mining, Lake Victoria basin, Tanzania

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dc.creator Machiwa, John F.
dc.date 2016-03-23T13:41:10Z
dc.date 2016-03-23T13:41:10Z
dc.date 2003
dc.date.accessioned 2018-03-27T08:22:31Z
dc.date.available 2018-03-27T08:22:31Z
dc.identifier Machiwa, J.F., 2003. Concentrations of metals in river sediment and wetland vegetations in mining, Lake Victoria basin, Tanzania. Tanzania Journal of Science, 29(2), pp.81-88.
dc.identifier 0856 1761
dc.identifier http://hdl.handle.net/123456789/1284
dc.identifier 10.4314/tjs.v29i2.18380
dc.identifier.uri http://hdl.handle.net/123456789/2310
dc.description Levels of metals were determined in river sediment, rice and sugarcane juice from Lake Victoria basin where small-scale gold processing activities are carried out to assess levels of contamination. Concentrations of metals in river sediments were generally high in areas that were closest to gold ore processing sites. For instance, mercury was highest (36.3 ±12.8 mg/g dw) in river sediments of Tigiti River in Mugumu District. Other heavy metals (Cd, Pb, Zn and Cu) had highest concentrations (2.20±0.71, 208±19.3, 412±20.1 and 132.7±11.9mg/g dw, respectively) in sediment samples from Kagota. The concentration of arsenic was highest (985.0±67.2 mg/g dw) in Mugusu River sediment. Mercury concentration in rice was highest (378.5±15.1mg/kg dw) in samples from Lwamgasa wetland and lowest (47.9±2.9 mg/kg dw) in samples from Saragurwa wetland. Cadmium concentrations in rice ranged from 2.3-5.5mg/kg dw, Zn and Cu ranged from 16340-27280mg/kg dw and 1150-2240mg/kg respectively. Arsenic was not detected in any rice sample. Lead was only detected in rice from Sengerema (150±12mg/kg dw), in a wetland that is close to the main road. Mercury concentrations in sugarcane juice were below the limit of detection (0.01mg/l) in all samples even those that were harvested closest to the gold ore-washing site at Samina. It is concluded that small-scale gold mining activities contaminate watercourses close to ore washing sites.
dc.language en
dc.publisher University of Dar Es Salaam
dc.subject Concentrations of metals
dc.subject river
dc.subject Sediments
dc.subject wetlands
dc.subject mining
dc.subject Lake Victoria basin
dc.subject vegetations
dc.subject Tanzania
dc.title Concentrations of Metals in River Sediment and Wetland Vegetations in Mining, Lake Victoria basin, Tanzania
dc.type Journal Article, Peer Reviewed


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