Heavy Metal Pollution and Its Effects on Urban Agriculture In Case of, Peacock and Gofa Vegetable Farming, in Addis Ababa, Ethiopia.
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Date
2018-01-02
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Addis Ababa University
Abstract
Heavy metal pollution and its effects on urban agriculture in case of, peacock and gofa vegetable farming, in Addis Ababa, Ethiopia.
Asayech Worku Woyesa
Addis Ababa University, 2018
Rivers in urban areas including Addis Ababa has water quality problems. Domestic and industrial wastes, often discharged untreated into water bodies that causing potentially toxic element mainly heavy metal concentrations in water and Vegetables produced by irrigating river. The objective of this study was to evaluate the degree of selected heavy metals pollution in vegetables, river water, and soil sediments from peacock and Gofa vegetable farming sites. In the study vegetables; swiss chard, lettuce, potato, and cucumber, soil sediment and river water samples were collected. The extraction of heavy metals was done by standard methods (APHA). The heavy metal in all samples were analyzed by ICP-OES. The data obtained was analyzed using SPSS version 20. Turkey post hoc test was used to determine the level of significance of variations between the samples and Pearson correlation was applied to test the relationship between various parameters. pH, EC, T.N, AV. P, OC, texture of soil sediment and, BOD, COD pH, EC, T.N, & AV. P of river water were analyzed. From analyzed eleven heavy metals in river water and soil sediment samples, analysis showed that the highest concentration of Fe was observed at Kera river, and the lowest concentration of Cd in river and Cu in sediment was obtained. In the current study the eleven metals in river water and sediments samples decreased in the following order, Fe > Mn > Sn > B > Pb > Cr > As > Zn > Ni > Cu > Cd, and Fe > M n > B > Pb > Sn > As > Zn > Cr > Ni > Cd > Cu respectively. In vegetables sample the highest heavy metal concentration was found in Swiss chard 6.63 mg/kg at Gofa site and the lowest was in Potato 0.7246mg/kg at Bulbula site. As, Pb, B, Mn and Fe from river water, As, Cd and Sn from soil sediment sample, and As and Pb from vegetable sample, were more than recommended maximum limit.
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Heavy Metals, Kebena River, Kera River, Bulbula River, Vegetables, Sediments