بررسي منشا و دسترسي بيولوژيكي عناصر سنگين د ر خاك ارتعاشات شمال غرب ايران

Evaluation of source and biological accessibility of heavy metals in the soil of Tehran northwestern elevations

Soil can retain the environmental pollution, so by chemically analyzing it, we can learn about the pollution of a region. In the present study, samples of Tehran northwest soil are used. In total, 16 soil samples are collected and the mean concentration of Pb, Zn, Ni, and V are computed to be 173ppm, 101 ppm, 62 ppm, and 44 ppm, respectively. The results show a higher concentration of Pb than those of other elements. Moreover, the mean Pb concentration in the present study is 1,200% higher than that of the earthʹs crust, which is because of air pollution. The elements (Pb, Zn, Ni, V, & Fe) were also studied in terms of biological accessibility and the related figures were obtained in the following order: Pb(929ppm)>Zn(27ppm) > Fe(7ppm) > Ni(5ppm) > V(0ppm) Furthermore, the cluster analysis revealed that Pb had an organic basis and that there was a high positive relationship between Ni and V. Since V is known as an oil pollution indicator, it can be concluded that Ni is scattered in the soil of the region due to fuel consumption