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Time and Space Dependence of Ionic Composition of the Kebena River in Addis Ababa

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dc.contributor.advisor Hundhammer, Bernd (PhD)
dc.contributor.author Tsegaye, Dereje
dc.date.accessioned 2018-06-16T15:14:57Z
dc.date.available 2018-06-16T15:14:57Z
dc.date.issued 2001-06
dc.identifier.uri http://etd.aau.edu.et/handle/123456789/1055
dc.description.abstract The Kebena River traverses Addis Ababa from north to south, The river starts upstream from a scarcely populated area and goes to the south through the densely populated areas. The difference in ionic compositions as one goes from upstream to down stream is then an indication of human impact on the quality of water. The geogenic ions, which are introduced from the natural environment through which the water passes, and the anthropogenic ions, which mainly enter into the water by the action of man, have been determined . The pH, conductivity, alkalinity, the chemical oxygen demand (COD), ammonium, nitrite, nitrate, phosphate, sulfate, chloride, fluoride, sodium , potassium, magnesium , calcium ions and silica have been determined from three different sampling sites, which represent upstream, midstream and downstream using standard methods of analysis. Time and space dependence of ionic composition has been studied starting from the end of the rain season (September, 2000) to the beginning of the small rain (April, 2001). The diy season dominates in between. The increase in concentration of the anthropogenic ions as nitrate, nitrite, ammonium, phosphate, COD, and chloride, as one goes from upstream to downstream through the highly populated areas and the increase in these ions as the rain ceased and the surface runoff decreased were very good indications of the deterioration of water quality by human activities; by direct disposal of liquid and solid wastes to the river The Addis Ababa city solid waste disposal site is the landfill at Kore (Jimma Road). Two samples were taken to determine the ionic composition of the runoff from this landfill. Emphasis was given for trace elements, especially cadmium, lead, copper, and zinc, differential pulse stripping voltammetry (DPSV) was used for their determination. The trace elements (Cu, Pb, Cd and Zn) were not detected using DPSV, which has a detection limit of 1O'7-1O'8 M. en_US
dc.language.iso en en_US
dc.subject Time and Space Dependence en_US
dc.title Time and Space Dependence of Ionic Composition of the Kebena River in Addis Ababa en_US
dc.type Thesis en_US

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