Geochemistry of Natural and Anthropogenic Dusts of Ray City, Tehran, Iran
[1]
Mohammad Yazdi, Department of Geology, Faculty of Earth Science, Shahid Beheshti Unversity, Tehran, Iran.
[2]
Hamideh Soltanzadeh, Faculty of Environment and Energy, Tehran Science and Research Branch, Islamic Azad University, Tehran, Iran.
[3]
Aida Biati, Faculty of Environment and Energy, Tehran Science and Research Branch, Islamic Azad University, Tehran, Iran.
The Ray City is located on the southern suburbs of Tehran in the northern Central Iran region. The samples for the present study were collected from main streets of Ray City, in dry climatic conditions of summer and wet climatic conditions of winter during heavy rush-hour of evening. The 19 dusts samples were analyzed by ICP-OES for 49 elements such as Pb, Zn, 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 geo-accumulation index were calculated for these samples. Data processing shows the enrichment of Ag, Pb, Zn, Cu, As, S, Ba, U, Zr, Sr and Hf relative to the earth’s crust. The results of enrichment factors indicate that the Ag, Pb, Zn, Cu, Hg, and S in all of the streets are located in extremely high enrichment region. Muller geo-accumulation index represents high pollution range for Ag, Pb, Zn and S in all of the streets’s samples. The results show that this high pollution is due to emissions from Tehran refinery, metallurgical activities, erosion, holly shrine of Abudalazim and vehicular traffics (fossil fuel combustion). Finally we used one-step chemical separation method to calculate the anthropogenic and non-anthropogenic ratio. The samples were analyzed by AAS for Pb, Mn, Fe, Cu, Zn, Ni and Co. The results reveal that the anthropogenic ratio is too high relative to the non- anthropogenic factors in pollution of these dusts.
Geochemistry, Origin, Dust, Urban, Ray City
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