تجمع فلزات سنگين سرب و روي در برگ و ميوه درختان زيتون (.Olea europaea L) و خاك آبياري شده با فاضلاب شهري

Investigation of Heavy Metals Accumulation in Soil, Leave and Fruit of Olive (Olea europaea L.) Irrigated with Municipal Effluent

The most factor of making unbalance in irrigation of soil with municipal effluent is the presence of heavy metals in municipal effluent and transformation of this pollution in food chain and threaten of healthy. The aim of the present study was to determine the effect of irrigation with municipal effluent on accumulation of heavy metals (Pb and Zn) in different layers of soil (0-15, 15-30 and 30-60 cm depths) and Olea europaea s leaves and fruits in Tehran green space. The study area located on southern of Tehran and the study was performed a random-systematic design with three replications with olive species and two irrigation levels with municipal effluent and well water (during 7 years). After determination of topography and geographical properties of control and polluted area, in each treatment, three samples were selected systematic randomly. In each samples, soil (0-15, 15-30 and 30-60 cm depths); leaves and fruits of olive trees were collected for analyses in three replications. Samples were dissolved in acid and the concentrations of Pb and Zn in samples were determined by atomic absorption spectrometry. For comparison of concentrations of heavy metals in layers of soil, leaves and fruits and due to normality of data independent sample t-test was used. Results of this study show that application of municipal effluents increase concentration of heavy metals in different layers of soil (0-15, 15-30 and 30-60 cm depths) and Olea europaeaʹs leaves but did not show accumulation of Olea europaea s fruit. Use of municipal effluent in long term may be increase heavy metal in soil and plant tissues