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Show simple item record Walters, Chavon R Somerset, VS Leaner, JJ Nel, JM 2011-11-24T07:38:07Z 2011-11-24T07:38:07Z 2011-08
dc.identifier.citation Walters, CR, Somerset, VS, Leaner, JJ and Nel, JM. 2011. Review of mercury pollution in South Africa: current status. Journal of Environmental Science and Health, Part A, Vol 46(10), pp 1129-1137 en_US
dc.identifier.issn 1093-4529
dc.description Copyright: 2011 Taylor & Francis. This is an an ABSTRACT ONLY en_US
dc.description.abstract The present paper is a review on the status of mercury (Hg) as a pollutant in South African aquatic ecosystems. Spatial patterns of Hg distribution and bioaccumulation in water resources were investigated by collecting and analyzing multimedia samples for physiochemica and Hg-species determination from 62 sampling sites. The data presented showed a wide range in concentrations, which was expected given the array of environmental parameters, water chemistry and sources of Hg. Generally, higher Hg concentrations were measured in environmental compartments impacted by the major anthropogenic Hg sources which, in South Africa, are largely represented by emissions from coal-fired power stations (i.e. Olifants and Upper Vaal WMAs) and artisanal gold mining (i.e., Inkomati WMA). Ancillary water quality parameters (e.g. pH, temperature, DOC, EC and nutrients) were measured and regressed with the measured Hg concentrations to determine which environmental parameters most influenced regional Hg concentrations. The TotHgsed and DOC concentrations were identified as important factors controlling TotHgaq, while TotHgsed were correlated to TotHgaq. This result is indicative of the combined effects of sediment settling and resuspension in the aquatic environment. In contrast, MeHgaq was not correlated to DOC. MeHginvert were correlated to MeHgsed, while MeHgfish were correlated to MeHgaq and water quality variables (chlorides - Cl- and electrical conductivity - EC). A steady progress has been made in Hg research in South Africa. However, despite the substantial knowledge about Hg toxicity, there are still considerable knowledge gaps on the fate and transport of Hg. Hence, further environmental and human health studies are proposed. en_US
dc.language.iso en en_US
dc.publisher Taylor & Francis en_US
dc.relation.ispartofseries Workflow request;7461
dc.subject Mercury en_US
dc.subject Mercury pollution en_US
dc.subject Environmental parameters en_US
dc.subject South African aquatic ecosystems en_US
dc.subject Water pollution en_US
dc.subject Methylmercury en_US
dc.subject Invertebrates en_US
dc.subject Hg toxicity en_US
dc.title Review of mercury pollution in South Africa: current status en_US
dc.type Article en_US

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