Comparison of lead content absorption in different parts of Eldar pine (Pinus eldarica Medw.) in Tehran city

Abstract

Evaluation of toxic metal concentration in soil and plants are the most important subject according to the health of ecosystem. This study was carried out to investigate on the lead content absorption in different parts (leaf, root and branch) of Eldar pine (Pinus eldarica Medw.) trees in Tehran city. For this aim in polluted sites (Azadi, Bahman and Bazar) and controlled site (Aghdasiyeh), in defferent seasons (January, March, July and September) and in different distance of air pollution measurment station (0, 500m and 1000m), 432 samples from leaves, branches and top root were collected and lead content density in each samples determined by atomic absorption instrument model Varian 220. Result indicated that lead content absorption in root of pine was higher than aerial parts (leaf and branch). Lead absorption in parts of tree in Azadi site was higher than other sites and the lowest content of lead was measured in Aghdasiyeh site. However, the highest lead content in parts of trees was observed in September and the lowest in March. The results also showed that by increasing of distance from air pollution measurment station, lead content absorption in parts of trees decreased