Evaluating the Ecological Risk of Lead and Cadmium Contaminants in the Courtyard Dust of Schools in Selected Regions of Tehran

Subject Areas : Environmental pollutions (water, soil and air)

Zeinab Molaee ¹ ( M.Sc., Environmental Science, Department of Natural Resource and Environmental, Islamic Azad University, Science and Research Brach. Iran )
Abbas Esmaili sari ² ( Professor of Environmental Science, Department of Natural Resource and Environmental, Tarbiat Modarres University, Iran * (Corresponding Author) )

Received: 2014-09-17 Accepted : 2016-02-07 Published : 2020-09-22

Keywords: School, Tehran city, Lead, Cadmium, dust,

Abstract :

Background and Objective: The phenomenon of air pollution in urban and industrial areas is one of the most important environmental problems that threaten human health. Among these pollutants, heavy metals contained in air dust can enter the human body directly through ingestion and breathing, or through ground falls to the surface of the earth, and after contamination of water resources and entering the structure of plants through Water and food enter the body. This study aimed to determine the concentration of lead and cadmium contaminants in the dust of the yard of selected schools in Tehran. Method: A total of 24 dust loss samples were collected from the courtyard of eight selected schools, due to the dispersion of these areas in Tehran during the fall. Then, the values of heavy metals of lead and cadmium were measured by a flame atomic absorption. Findings: The results showed that there is a significant difference between the concentrations of metals in different stations; also, the results showed that all stations studied were very high in terms of ecological risk index for living organisms. Discossion and Conclusion: In general, the results show that in areas with high traffic load and high traffic in Tehran, the highest pollution and high ecological risk were not available in other regions.  

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