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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/220

Title: Hydrogeochemical Investigation of Lake Beseka with Some Selected Parameters
Authors: Abubeker, Wubet
Advisors: Dr. Feleke Zewge
Dr. Mesfin Redi
Dr. Tenalem Ayenew
Copyright: 2007
Date Added: 13-Nov-2007
Publisher: Addis Ababa University
Abstract: Lake Beseka is found within the volcanically active rift floor at the northern end of the Main Ethiopian Rift (MER). The lake water, which has a brownish-yellow color, is highly mineralized. In addition, its hydrogeochemistry has been changing due to the continuous expansion of the lake for the last four decades. Taking the above considerations in to account, it has been found important and necessary to investigate the current hydrogeochemistry of the lake water in terms of some selected parameters. The results reveal spatial variation in temperature, pH, TDS, EC and dissolved iron and cobalt concentration levels across the surface of the lake. The depth-profiles of pH, TDS, EC; and dissolved iron and cobalt levels of concentration show generally either decreasing, or increasing, or the combination of both, trends along down the depths of the lake. However, the dissolved concentration levels of the trace metals: Mn, Ni and Cr were below instrumental detection limits. The brownish-yellow color of the water is found out to be due to the relatively higher trace metal concentration of iron the lake water contains. It also appears that the iron is imparting the brownish-yellow color to the lake water either in the form of colloids of Fe(OH)3, or in the form of dissolved hydrated ferric ions.
Description: A Thesis Submitted to the School of Graduate Studies of the Addis Ababa University in Partial Fulfillment of the Requirements for the Degree of Master of Science in Environmental Science
URI: http://hdl.handle.net/123456789/220
Appears in:Thesis - Environmental Sciences

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