Hydrogeochemical Investigation Of Lake Beseka With Some Selected Parameters

Lake Beseka is found within the volcanically active rift floor at the northernrnend of the Main Ethiopian Rift (MER). The lake water, which has arnbrownish-yellow color, is highly mineralized. In addition, itsrnhydrogeochemistry has been changing due to the continuous expansionrnof the lake for the last four decades. Taking the above considerations in tornaccount, it has been found important and necessary to investigate therncurrent hydrogeochemistry of the lake water in terms of some selectedrnparameters. The results reveal spatial variation in temperature, pH, TDS, ECrnand dissolved iron and cobalt concentration levels across the surface ofrnthe lake. The depth-profiles of pH, TDS, EC; and dissolved iron and cobaltrnlevels of concentration show generally either decreasing, or increasing, orrnthe combination of both, trends along down the depths of the lake.rnHowever, the dissolved concentration levels of the trace metals: Mn, Nirnand Cr were below instrumental detection limits. The brownish-yellowrncolor of the water is found out to be due to the relatively higher tracernmetal concentration of iron the lake water contains. It also appears thatrnthe iron is imparting the brownish-yellow color to the lake water either inrnthe form of colloids of Fe(OH)3, or in the form of dissolved hydrated ferricrnions.

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