Abstract
The fish organs and water was collected from three sampling sites of Lakes Chamo and Abaya. A procedure consuming 12 mL mixture of HNO 3 -H 2 O 2 for gill, kidney, liver and 1:2.5 mL mixture of HNO 3 -HCl for water samples for digestion of was developed. Concentrations of six metals in water and their accumulation in the edible tissue of Tilapia (Oreochromis niloticus) and Barbus (Labeobarbus intermedius) fish species were determined using Flame Atomic Absorption Spectroscopy. The results revealed that the average heavy metal concentrations in water samples were; Zn 0.017, Cu 0.077, Fe 7.50, Cr 0.033, Cd 0.264 and Pb 1.731 mg/L respectivelty. The highest concentrations of iron (Fe) and lead (Pb) were observed at Chamo Park and Sile sites, respectively. The average contents of heavy metals in fish samples were; Zn 0.062, Cu 0.047, Fe 2.270, Cr 0.041, Cd 0.045 and Pb1.78 mg/Kg in both fish species. The highest accumulations of iron (Fe) and lead (Pb) concentration were observed in liver and gill of Tilapia fish from Chamo Lake. There was no significant difference between the two lakes in accumulating trace metals. Keywords : Fish variety, Heavy metals, Lakes, ANOVA DOI : 10.7176/FSQM/83-05
Highlights
Metals are elements, present in chemical compounds as positive ions, or in the form of cations (+ ions) in solution
The present study focuses on the levels of selected of toxic heavy metal (Zn, Cu, Fe, Cr, Cd and Pb) in two fish species; Tilapia (Oreochromis niloticus) and Barbus (Labeobarbus intermedius), and water samples collected from Abaya and Chamo Lakes, which are located in Rift Valley of Ethiopia
Summary and Conclusions The study determines heavy metals concentrations in edible part of two fish species (Oreochromis niloticus and Labeobarbus intermedius) as well as with water samples collected from Chamo and Abaya, Ethiopian Rift Valley Lakes
Summary
Present in chemical compounds as positive ions, or in the form of cations (+ ions) in solution. Heavy metals are among the most serious environmental pollutants due to their high toxicity, abundance and ease of accumulation by various plant and animal organisms. Persistent increase of heavy metals in harbor sediments can be attributed to the contribution of effluent from waste water treatment plants, industries, mining, power stations and agriculture (Guevara-Riba et al, 2004). Heavy metals are extremely persistent in the environment They are non-biodegradable and non-thermo degradable and readily accumulate to toxic levels (Guevara-Riba et al, 2004). They are released into the environment from natural as well as anthropogenic activities
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