Accumulation of Zn, Cu, Ni and Pb in soil and leaf of Robinia pseudoacacia L. following irrigation with municipal effluent
2009
Salehi, A., M.Sc. in Forestry, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University | Tabari, M., Associate Professor, Forestry Department, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University | Mohammadi, J., Associate Professor, Soil Science Department, Shahrekord University | Ali-Arab, A. R., Ph.D. student in Forestry, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University
Irrigation with effluent maybe increases concentration of heavy metals in soil and plant. Hence, a case study was undertaken to assess the long-term effect of effluent irrigation on heavy metals content in soil and plant. In this study, two sites under afforestation of black locust (Robinia pseudoacacia L.) trees irrigated by municipal effluent and well water in south of Tehran for at least 15 years were selected. For this purpose, four sample plots (30 m × 30 m) were randomly chosen in either of both areas. In each plot four trees were selected to collect the leaf samples. Under each selected tree a soil profile was dug to take the samples in depths of 0-15, 15-30, 30-60. In laboratory, the concentration of Zn, Cu, Ni and Pb of water (effluent and well water), soil and leaf samples were determined. Results indicated that municipal effluent had higher amount of Zn, Cu, Ni and Pb compared to well water. The concentrations of Zn, Ni and Pb of municipal effluent and Ni and Pb of well water were greater from those of the normal ranges (WHO). The heavy metals accumulations of soil were significantly greater in area irrigated with municipal effluent than in well water and also in depth of 0-15 compared to lower layers. Pb concentration of soil irrigated by municipal effluent and well water, and Ni concentration of soil irrigated by municipal effluent were greater than those of the normal ranges (EPA). The results did not show any accumulation of Ni and Pb in leaf samples but Zn and Cu concentrations in leaf of trees irrigated by municipal effluent were significantly greater than those irrigated by well water but were not dangerous for the tree.
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