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Anthropogenic sources and environmentally relevant concentrations of heavy metals in surface water of a mining district in Ghana: a multivariate statistical approach

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dc.contributor.author Armah, Frederick A.
dc.contributor.author Obiri, Samuel
dc.contributor.author Yawson, David O.
dc.contributor.author Onumah, Edward E.
dc.contributor.author Yengoh, Genesis T.
dc.contributor.author Afrifa, Ernest K. A.
dc.contributor.author Odoi, Justice O.
dc.date.accessioned 2021-03-23T20:29:26Z
dc.date.available 2021-03-23T20:29:26Z
dc.date.issued 2010
dc.identifier.issn 23105496
dc.identifier.uri http://hdl.handle.net/123456789/5166
dc.description 11p:, ill. en_US
dc.description.abstract The levels of heavy metals in surface water and their potential origin (natural and anthropogenic) were respectively determined and analyzed for the Obuasi mining area in Ghana. Using Hawth’s tool an extension in ArcGIS 9.2 software, a total of 48 water sample points in Obuasi and its environs were randomly selected for study. The magnitude of As, Cu, Mn, Fe, Pb, Hg, Zn and Cd in surface water from the sampling sites were measured by flame Atomic Absorption Spectrophotometry (AAS). Water quality parameters including conductivity, pH, total dissolved solids and turbidity were also evaluated. Principal component analysis and cluster analysis, coupled with correlation coefficient analysis, were used to identify possible sources of these heavy metals. Pearson correlation coefficients among total metal concentrations and selected water properties showed a number of strong associations. The results indicate that apart from tap water, surface water in Obuasi has elevated heavy metal concentrations, especially Hg, Pb, As, Cu and Cd, which are above the Ghana Environmental Protection Agency (GEPA) and World Health Organization (WHO) permissible levels; clearly demonstrating anthropogenic impact. The mean heavy metal concentrations in surface water divided by the corresponding background values of surface water in Obuasi decrease in the order of Cd > Cu > As > Pb > Hg > Zn > Mn > Fe. The results also showed that Cu, Mn, Cd and Fe are largely responsible for the variations in the data, explaining 72% of total variance; while Pb, As and Hg explain only 18.7% of total variance. Three main sources of these heavy metals were identified. As originates from nature (oxidation of sulphide minerals particularly arsenopyrite-FeAsS). Pb derives from water carrying drainage from towns and mine machinery maintenance yards. Cd, Zn, Fe and Mn mainly emanate from industry sources. Hg mainly originates from artisanal small-scale mining.It cannot be said that the difference in concentration of heavy metals might be attributed to difference in proximity to mining-related activities because this is inconsistent with the cluster analysis. Based on cluster analysis SN32, SN42 and SN43 all belong to group one and are spatially similar. But the maximum Cu concentration was found in SN32 while the minimum Cu concentration was found in SN42 and SN43 en_US
dc.language.iso en en_US
dc.publisher University of Cape Coast en_US
dc.subject Gold mining en_US
dc.subject Heavy metals en_US
dc.subject Multivariate statistics en_US
dc.subject Obuasi en_US
dc.subject Water bodies Ghana en_US
dc.title Anthropogenic sources and environmentally relevant concentrations of heavy metals in surface water of a mining district in Ghana: a multivariate statistical approach en_US
dc.type Article en_US


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