Accumulation of Heavy Metals in Soil, Leaf and Fruit of, Malus domestica, Elaeagnus angustifolia and Pyrus communis Trees around A Zinc Factory in Zanjan, Iran

Heavy metals cannot be analyzed in the environment easily and can cause many problems in the concentrated food chain for the environment and human being. The purpose of this research is the evaluation of Malus domestica, Elaeagnus angustifolia and Pyrus communis in terms of the rate of absorption in metals such as Lead, Cadmium, Nickel and chrome through the leaves of trees in the surrounding of Zanjan lead and Zinc factory and also determination of the mentioned trees health. Randomly, we gathered our samples based on the soil, leave and the fruits of the mentioned trees. The digestion of the samples was done by acidic digestion and the rate of concentration was measured by the help of atomic absorption set. The results showed that the highest rate of concentration was in Pb and Cd metals and in the leaves of Pyrus communis and Elaeagnus angustifolia were (3/08 µg/gr and 64/8 µg/gr) respectively. The concentration of Ni was less that others. The highest rate of lead concentration was in Malus domestica(4/16 µg/gr)and the highest rate of Cr was found in Elaeagnus angustifolia (2/5 µg/gr), and also the concentrations of Cd and Ni were less than other metals. The results of this research showed that Malus domestica, Eleagunus angustifolia, and pyrus communis trees could absorb heavy metals in their leaves more than others. Even this action has high importance because of pollution reduction in soil, the concentration of these metals in the fruits can be regarded as a danger for the health of human beings.