Assessing human health risk and the amount of surface soils contamination of Arak city by some toxic elements

Document Type : Original Article


1 Department of Environment, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran.

2 Department of Soil Sciences, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran.

3 Department of Geology, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran.



Population growth, the presence of numerous factories and a large number of vehicles are considered as the main sources for environmental pollution and heavy metals in Arak Industrial City. A total of 30 samples of heavy metals including, Lead (Pb), Zinc (Zn), copper (Cu), Nickel (Ni), Arsenic (As), Chromium (Cr) and cadmium (Cd) in surface soils were taken from a depth of 0-20 cm and measured using Atomic Absorption Spectroscopy (AAS) (PG990 Model). The results showed that the mean concentration of all heavy metals except As had a higher average of the background (baseline) values in the world. Heavy metals As and Zn were non-contaminated based on Igeo indices. As the results of this index for heavy metals Pb, Cu, Ni, Cr and Cd indicated the presence of contamination and their accumulation in surface soils. All samples had high level of contamination in terms of NIPI index. The TEF index of heavy metals Ni, Cr, Pb and Cu was higher than other metals. That illustrates geochemical behavior and similar origin of anthropogenic sources for these metals. RI's potential ecological risk for high risk and extremely high risk metals indicated a high level and of non-cancerous evaluation of health showed that heavy metals Cr and Pb had non-cancer effect on children. HI risk index values were in all heavy metals for children than adults. Also, the results of evaluation of carcinogenic health risks showed that the risk of chromium carcinogenicity for children creates a serious health threat to children and adults.


Main Subjects