Environmental Geochemistry and Geology of Dusts in Ray City
Subject Areas :Mohammad Yazdi 1 , Hamideh Soltanzadeh 2 , Aida Biati 3
1 - Associated Prof., Department of Geology, Faculty of Earth Sciences, Shahid Beheshti Unversity
2 - M.Sc. Holder of Environmental Geology, Tehran Science and Research Branch, Islamic Azad University
3 - Assistant Prof., Faculty of Environment and Energy, Tehran Science and Research Branch, Islamic Azad
University
Keywords: dust, Geochemistry, origin, Ray city,
Abstract :
In the following research 19 samples were collected from dust of the main streets of Ray City in dry conditionsof the summer and wet conditions of the winter in heavy traffic time of evening. The samples were analyzed byICP-OES for 49 elements such as Pb, Zn, and Cu, As, Fe, Ni, Cr, Cd, Mn and Bi. Also, 15 samples wereanalyzed by XRF to determine major oxide and minor elements. The enrichment factors and Mullergeoaccumulation 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 indicatethat Ag ٬Pb ٬Zn ٬Cu, Hg ٬S٬ have the highest enrichment level. Muller geoaccumulation index is representedhigh pollution range for Ag ٬Pb ٬Zn ٬S in all streets. The results show that this high pollution are related toTehran refinery, metallurgical activities, erosion of Holly Shrine of Abudalazim and vehicles (fossil fuelcombustion). Finally we used one-step chemical separation method to calculate the anthropogenic and nonanthropogenic ratio. The samples were analysed by ASS for Pb, Mn, Fe, Cu, Zn, Ni, Co. The results show thatthe anthropogenic effects of these elements are more than that of non- anthropogenic factors. It is because of thegreat influence of using natural resources in the productions of concrete factory
