Investigating the concentration of heavy metals and soil pollution indicators in west of Tehran
Subject Areas :
ENVIROMENT
Fataneh Valinejad Tabrizi
1
(PhD student, Department of Climatology, Faculty of Human Sciences, University of Science and Research)
Azadeh Arbaby
2
(Department of Geography and Urban Planning, Azad University, Islamshahr Branch)
Reza Borna
3
(Associate Prof. Department of Geography, Islamic Azad University, Ahvaz, Iran)
Received: 2023-05-02
Accepted : 2023-08-27
Published : 2023-08-23
Keywords:
soil,
air pollution,
Tehran,
Heavy elements,
pollution index,
Abstract :
The expansion of urbanization and the development of cities along with the rapid increase in population, the development of industrial activities and the excessive consumption of fossil fuels have greatly increased pollution and have turned this issue into one of the environmental issues in recent decades. Tehran metropolis is one of the cities with high air pollution, which can be deposited in the soil and observed in the long term. In this research, in order to evaluate the concentration of heavy elements from the soil of the three areas of the 21st district of Tehran municipality, 10 samples were prepared with three repetitions and a total of 90 samples. Sampling was performed from a depth of 0-20 cm with three replications. Degree of pollution, pollution load index, and ecological risk index were used to assess pollution. Comparison of the concentrations of heavy elements and the trend of their changes showed that the accumulation of these elements has been created in the soil surface. The mean concentrations of the studied elements in zones 2 and 3 were higher than zone 1 (P-value < 0.05). Based on the results, the concentration of the studied elements in regions of two and three were higher than area one (P-value <0.05). Also, the pollution index being higher than one, indicates a high concentration of heavy elements compared to the background concentration in the studied area. The results of this research showed that due to the increasing development of urban and industrial areas in west Tehran, the soil of this area is highly exposed to heavy elements. Therefore, it seems necessary to regularly monitoring the soil of the region in terms of heavy elements and to carefully check the origin of these elements.
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