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The influence of AVS in sediments upon the bioavailability of metals in the mudfish, Labeo molybdinus, from the Olifants River, Kruger National Park

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dc.contributor.advisor Prof. Victor Wepener; Prof. Lieven Bervoets en_US
dc.contributor.author Dyke, Sarah
dc.date.accessioned 2012-08-16T09:43:20Z
dc.date.available 2012-08-16T09:43:20Z
dc.date.issued 2012-08-16
dc.date.submitted 2012-05-23
dc.identifier.uri http://hdl.handle.net/10210/5979
dc.description M.Sc. en_US
dc.description.abstract Sediments within riverine systems act as sinks for metals. Aquatic organisms which are associated with sediments are therefore at risk of being exposed to metals that can be taken up, resulting in adverse biological responses. Due to the processes of bioconcentration and bioaccumulation, all organisms within a food web are thus potentially exposed. Different sediment characteristics can alter the concentrations of metals which are bioavailable to organisms, as well as their impact upon the effected organism. The bioavailability of sediment-bound metals is determined by complex interactions amongst various environmental, biological, physical and chemical parameters. The effects of metals on aquatic organisms are associated with the type and duration of exposure, the concentration and bioavailability of the pollutants, and the sensitivity of the organisms to the toxic effects of the contaminants. Rivers such as the Olifants in Mpumalanga River contain high concentrations of metals. This is due to increased levels of mining activities within the catchment area, which impact directly upon the system. The river has also has an increased siltation load resulting from amplified agricultural, mining and afforestation activities. Following their introduction to aquatic systems, metals from mining effluents adsorb to sediments and suspended particles within the aquatic environment. These metals are then available for uptake by aquatic organisms. The aim of this study is to determine whether acid-volatile sulphides (AVS) influence the availability of sediment-bound metals to benthic dwelling fish species. The study was undertaken in the Olifants River Kruger National Park. At the 5 selected Sites sediment and the bottom dwelling Leaden mudfish (Labeo molybdinus) (Sites 1, 2 and 3) were sampled during a low flow period. Bioavailable metal concentrations in sediments were determined using the Community Bureau of Reference (BCR) soil extraction protocol. As certain characteristics influence metal uptake and bioavailability within sediment, the concentrations of AVS and total organic carbon (TOC) within the sediment were also analysed. Liver tissue samples of L. molybdinus were analysed for Cr, Cu, Ni, Pb and Zn using ICP-OES and ICP-MS techniques. Water nutrient and anion analysis and characterisation of dissolved and suspended metal concentrations were assessed using a Merck Spectroquant Photometer SQ 118, and the Thermofisher x-series ICP-MS, respectively. Analysis revealed high concentrations of Total Dissolved Solids (TDS) and SO4 2- within the water column, with high metal concentrations within analysed Total Suspended Solids (TSS). en_US
dc.language.iso en en_US
dc.subject Acid-volatile sulphides en_US
dc.subject Labeo - Effect of metals on
dc.subject Metal wastes
dc.subject Gravel roads - Environmental aspects
dc.subject Commercial forests - Environmental aspects
dc.subject Aquatic ecology
dc.subject Olifants River (South Africa)
dc.subject Kruger National Park (South Africa)
dc.title The influence of AVS in sediments upon the bioavailability of metals in the mudfish, Labeo molybdinus, from the Olifants River, Kruger National Park en_US
dc.type Mini-Dissertation en_US

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