Evaluation of concentration of some heavy metals in some vegetables grown in Ashati agriculture project
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Heavy Metals, Vegetables, Contamination, irrigation, fertilizers.
Abstract
Ashati agriculture project built in 1975 for the production of vegetables and as well as grasses for animals. Since that time vegetables were grown and fertilized by chemical fertilizers and manures. therefore this investigation was conducted to study the state of the accumulation of some heavy metals such as, Fe, Zn. Cu, Mn, Cr, Pb, Cd and Ni. in some selected vegetables which include Solanumtuberosum(Potatoes), Allium cepa L. (Onion), DaucusCorota L. (Carrot), CucurbitaPepo(Courgette ),Solanummelongena L. (Eggplant), Lactuca sativa L. (Lettuce), Petroselinumcrispum (mill.) Nym.(Parsley) and Spinaceaoleracea (Spinach). The mean levels of these heavy metals were ranged from 81.2-237.8, 11.5-56.3, 0.0-0.16, 06.9-42.6, 0.0-0.03, 0.0-20.13, 0.0-2.36 and 0.0-08.13. ppm for Fe, Mn, Cu, Zn, Pb, Ni, Cd and Cr. respectively. Soil samples were also collected from the same sites of collected vegetables, concentration of these metals in the soil were 2151.1, 265.4, 0.0, 8.7, 0.38, 15.85, 0.87 and 1.75 ppm respectively. Among the vegetables studied Fe, Zn and Mn have the highest concentrations even though they are still within the permissible value for the human consumption, whereas concentration of toxic metals of Ni, Cd and Cr exceeded the allowable limits in some vegetables. The results also shows chemical fertilizers used contains high concentrations of heavy metals such 1.15, 33.0 and 6.4 ppm of Cd, Zn and Fe respectively as impurities.
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