A study of the pH-dependent charge of a selection of highly weathered humic soils

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dc.contributor.advisorFey, Martin Ven_ZA
dc.contributor.authorGubevu, James Sibusisoen_ZA
dc.date.accessioned2016-09-14T13:00:26Z
dc.date.available2016-09-14T13:00:26Z
dc.date.issued1997en_ZA
dc.descriptionBibliography: pages 79-86.en_ZA
dc.description.abstractAcid soils have long been associated with increased mobility of metals and the subsequent nutrient toxicity to plants, the cause of which is believed partly to be a reduction in cation exchange capacity (CEC). At the same time the reduction in CEC would result in a decline in the soil's ability to retain cations. The reduction in CEC is said to result from the development of positive charge at low pH in soils with variable charge which is enhanced by the amphoteric behaviour of Fe and AI oxides as well as the presence of organic matter. Aluminium tends to form stable complexes with organic matter and also competes with lower valency cations for exchange sites, in which way it interferes with the measurement of CEC in soils. Variation of charge with pH has important environmental implications, e.g. groundwater contamination with heavy metals as the soil becomes less capable of retaining them at low pH. Origin of variable charge in soil, factors affecting electric charge variation with pH and the methods employed in determining CEC appear to play an important role in understanding the concept of electric charge variation with pH as well as its environmental significance.en_ZA
dc.identifier.apacitationGubevu, J. S. (1997). <i>A study of the pH-dependent charge of a selection of highly weathered humic soils</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Geological Sciences. Retrieved from http://hdl.handle.net/11427/21774en_ZA
dc.identifier.chicagocitationGubevu, James Sibusiso. <i>"A study of the pH-dependent charge of a selection of highly weathered humic soils."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 1997. http://hdl.handle.net/11427/21774en_ZA
dc.identifier.citationGubevu, J. 1997. A study of the pH-dependent charge of a selection of highly weathered humic soils. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Gubevu, James Sibusiso AB - Acid soils have long been associated with increased mobility of metals and the subsequent nutrient toxicity to plants, the cause of which is believed partly to be a reduction in cation exchange capacity (CEC). At the same time the reduction in CEC would result in a decline in the soil's ability to retain cations. The reduction in CEC is said to result from the development of positive charge at low pH in soils with variable charge which is enhanced by the amphoteric behaviour of Fe and AI oxides as well as the presence of organic matter. Aluminium tends to form stable complexes with organic matter and also competes with lower valency cations for exchange sites, in which way it interferes with the measurement of CEC in soils. Variation of charge with pH has important environmental implications, e.g. groundwater contamination with heavy metals as the soil becomes less capable of retaining them at low pH. Origin of variable charge in soil, factors affecting electric charge variation with pH and the methods employed in determining CEC appear to play an important role in understanding the concept of electric charge variation with pH as well as its environmental significance. DA - 1997 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1997 T1 - A study of the pH-dependent charge of a selection of highly weathered humic soils TI - A study of the pH-dependent charge of a selection of highly weathered humic soils UR - http://hdl.handle.net/11427/21774 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/21774
dc.identifier.vancouvercitationGubevu JS. A study of the pH-dependent charge of a selection of highly weathered humic soils. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 1997 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/21774en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Geological Sciencesen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherGeological Sciencesen_ZA
dc.subject.otherGeochemistryen_ZA
dc.titleA study of the pH-dependent charge of a selection of highly weathered humic soilsen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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