Environmental Geochemistry and Geology of Dusts in Ray City

In the following research 19 samples were collected from dust of the main streets of Ray City in dry conditions of the summer and wet conditions of the winter in heavy traffic time of evening. The samples were analyzed by ICP-OES for 49 elements such as Pb, Zn, and Cu, As, Fe, Ni, Cr, Cd, Mn and Bi. Also, 15 samples were analyzed by XRF to determine major oxide and minor elements. The enrichment factors and Muller geoaccumulation index were calculated for these samples. Data processing shows enrichment in Ag ٬Pb ٬Zn ٬ Cu ٬As ٬S ٬Ba ٬U ٬Zr ٬Sr, Hf levels relative to earth's crust. The results of enrichment factors indices indicate that Ag ٬Pb ٬Zn ٬Cu, Hg ٬S٬ have the highest enrichment level. Muller geoaccumulation index is represented high pollution range for Ag ٬Pb ٬Zn ٬S in all streets. The results show that this high pollution are related to Tehran refinery, metallurgical activities, erosion of Holly Shrine of Abudalazim and vehicles (fossil fuel combustion). Finally we used one-step chemical separation method to calculate the anthropogenic and non- anthropogenic ratio. The samples were analysed by ASS for Pb, Mn, Fe, Cu, Zn, Ni, Co. The results show that the anthropogenic effects of these elements are more than that of non- anthropogenic factors. It is because of the great influence of using natural resources in the productions of concrete factory.