Evaluating And Determining Of Heavy Metals In The ‎atmospheric Dust By Using Statistical Methods (pca And Ca)‎

Today with the galloping rate of population air pollution has ‎recently become an inherent part of human life. In fact no one ‎can turn a blind eye to the enormous effect of this issue on ‎human health. Street dust is an indicator of air pollution status in ‎cosmopolitan atmosphere. It is very valuable for measuring the ‎amount of air pollution. In this research a spatiotemporal trend ‎has been conducted on heavy metals including Pb, Cd, Co, Zn, ‎Mn, Fe, Cu and Ni existing in Isfahan atmospheric area. In this ‎study temporal trend analysis of concentrations of heavy metals ‎through sampling during 7 months (May to November 2014) ‎revealed the fact that highest concentration of heavy metals Pb, ‎Cd, Zn, Ni and Cu showed in the last month of sampling ‎‎(November). Spatial trend of heavy metals variations in this area ‎also showed that the highest concentrations of Zn, Cu, Ni, Cd ‎and Pb exist in the center and southern part of the city (High ‎traffic, and Population); but, the concentration of Co, Mn and Fe ‎were almost uniformly distributed in all parts of the city. ‎Normalized elemental content of soil dust in ratio to their ‎corresponding value in reference soil has displayed the following ‎enrichment order: Zn> Cu> Co> Pb> Ni> Fe> Mn. The results ‎show that there are three main sources for heavy metals ‎available in atmospheric dust in Isfahan city. The first group is ‎metals with industrial-traffic source that contain Pb, Cd, Zn, Ni ‎and Cu. The second group comprises metals from natural soil ‎that contains Fe and Mn; and the third includes Co that ‎originates from various manufacturing industries.‎