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A. A. Abuzkhar A. S. Gibali Y. I. Elmehrik Rahmatullah 《Environmental monitoring and assessment》1987,8(2):127-133
Solid waste from the Tripoli Sewage Treatment Plant is being used for manuring various crops in Al-Hadba production project. To monitor concentrations of several heavy elements, essential and nonessential to plants that are potentially hazardous to animal and human healthy by entering food chain via soil-plant system, samples of solid waste were collected monthly (every four weeks) during the years 1980–1981. These samples were appropriately handled and analized for total -N, P, K, Ca, Mg, Na, Fe, Mn, Cu, Zn, Cd, Cr, Ni, Co, and Pb.The sludge samples were found to contain an average of 2.00–2.22–0.31% when expressed as a mixed fertilizer (N–P2O5–K2O) respectively. Concentrations of Zn, Pb, Ni, and Cd were greater than their critical levels of 1500, 550, 150, and 15 ppm in 54, 58, 8, and 29% of the samples respectively. The concentrations of Cu and Cr were less than their critical levels of 750 and 500 ppm in all samples respectively.Contribution of Al-Fateh University, Soil Science Dept. and The National Academy for Scientific Research, Environmental Protection Program, Tripoli, Libya. 相似文献
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