The geochemistry and phosphorus sorption characteristics of Mgeni catchment sediments

 

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dc.contributor.advisor Fey, Martin V en_ZA
dc.contributor.author Hounsome, Robin Simon en_ZA
dc.date.accessioned 2016-07-04T08:41:55Z
dc.date.available 2016-07-04T08:41:55Z
dc.date.issued 1995 en_ZA
dc.identifier.citation Hounsome, R. 1995. The geochemistry and phosphorus sorption characteristics of Mgeni catchment sediments. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/20189
dc.description Includes bibliographical references. en_ZA
dc.description.abstract The Mgeni River is vital for the continued industrial and social development of Durban and Pietermaritzburg and the river has been impounded in four places to provide a crucial water resource to these areas. The river is highly susceptible to anthropogenic pollution, particularly phosphorus, which may be derived from unsanitised peri-urban areas or run-off from fertilised agricultural lands. Sediments may be sources or sinks of pollution in aquatic systems. Grab samples of the uppermost sediment layer were taken from sites at each of the impoundments and analysed for salient geochemical characteristics, such as major and trace element concentrations, clay mineralogy, organic carbon, P fractionation, and particle size distribution. Batch experiments were also carried out to determine the P sorption desorption characteristics of the sediments under different pH and redox conditions. The sediments are dominated by clay sized material (< 2mm) which is composed of kaolinite, gibbsite, goethite, mica and other undifferentiated· 2: 1 layer silicates and quartz. Kaolinite, gibbsite and goethite are found extensively throughout the catchment area and are the result of intense weathering. These minerals readily sorb cations onto their surfaces. The significant correlations which were found between the clay content and the concentration of trace metals, particularly Mo, Pb, and Zn, most likely result from accumulations of cations on the mineral surfaces. It was suggested, therefore, that the Mgeni sediments are potential sinks for polluting elements. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Geological Sciences en_ZA
dc.title The geochemistry and phosphorus sorption characteristics of Mgeni catchment sediments en_ZA
dc.type Master Thesis
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Department of Geological Sciences en_ZA
dc.type.qualificationlevel Masters
dc.type.qualificationname MSc en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Hounsome, R. S. (1995). <i>The geochemistry and phosphorus sorption characteristics of Mgeni catchment sediments</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Geological Sciences. Retrieved from http://hdl.handle.net/11427/20189 en_ZA
dc.identifier.chicagocitation Hounsome, Robin Simon. <i>"The geochemistry and phosphorus sorption characteristics of Mgeni catchment sediments."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 1995. http://hdl.handle.net/11427/20189 en_ZA
dc.identifier.vancouvercitation Hounsome RS. The geochemistry and phosphorus sorption characteristics of Mgeni catchment sediments. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 1995 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/20189 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Hounsome, Robin Simon AB - The Mgeni River is vital for the continued industrial and social development of Durban and Pietermaritzburg and the river has been impounded in four places to provide a crucial water resource to these areas. The river is highly susceptible to anthropogenic pollution, particularly phosphorus, which may be derived from unsanitised peri-urban areas or run-off from fertilised agricultural lands. Sediments may be sources or sinks of pollution in aquatic systems. Grab samples of the uppermost sediment layer were taken from sites at each of the impoundments and analysed for salient geochemical characteristics, such as major and trace element concentrations, clay mineralogy, organic carbon, P fractionation, and particle size distribution. Batch experiments were also carried out to determine the P sorption desorption characteristics of the sediments under different pH and redox conditions. The sediments are dominated by clay sized material (< 2mm) which is composed of kaolinite, gibbsite, goethite, mica and other undifferentiated· 2: 1 layer silicates and quartz. Kaolinite, gibbsite and goethite are found extensively throughout the catchment area and are the result of intense weathering. These minerals readily sorb cations onto their surfaces. The significant correlations which were found between the clay content and the concentration of trace metals, particularly Mo, Pb, and Zn, most likely result from accumulations of cations on the mineral surfaces. It was suggested, therefore, that the Mgeni sediments are potential sinks for polluting elements. DA - 1995 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1995 T1 - The geochemistry and phosphorus sorption characteristics of Mgeni catchment sediments TI - The geochemistry and phosphorus sorption characteristics of Mgeni catchment sediments UR - http://hdl.handle.net/11427/20189 ER - en_ZA


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