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Soil is a non-renewable dynamic natural resource that is essential to human life and serves as the most important sink for toxic ingredients like trace elements (1,2). There have been great concerns about the contamination of hazardous elements due to rapid industrialization and urbanization during the recent decades (3-6). Trace elements via urban soils can intake into the human body through three ways, ingestion, inhalation and dermal absorption, accumulate in fatty tissues, and subsequently affect the nervous, endocrine and immune system; also, hematopoietic function and normal cellular metabolism (7,8). In evaluating anthropogenic contaminations, more attention should be paid to understanding the status, quantity and dispersion of the pollution in the ecosystem. There is the need for more detailed information about the accumulation and levels of human exposure to A-R-T-I-C-L-EI-N-F-O A-B-S-T-R-A-C-T Article Notes: Received: Feb 12, 2018 Received in revised form: Mar 29, 2018 Accepted: Apr 28, 2018 Available Online: May 1, 2018 Background & Aims of the Study: Regarding to development of industry, soil contamination has become a serious problem in many countries, such as Iran. The aim of the present work was the illustration of the accumulation of potentially harmful trace elements and the potential risk which is posed to human health in surface soils of three industrial estates of Aran-o-Bidgol city, Isfahan province of Iran. Materials & Methods: Altogether, 24 composite soil samples were collected at depths 0-20 cm from industrial estates of Helal, Sobahi and Ansar located in Aran-o-Bidgol in September and October 2014. Element contents (Cd, Pb, Ni, Zn and Cu) were extracted by 3 acids digestion (HF-HNO3-HClO4). Concentrations of Cu, Pb, Zn and Ni in soil extracts were analyzed by Flame Atomic Absorption Spectrometry, whereas Cd was measured by Graphite Furnace Atomic Absorption Spectrometry. The accumulation and non-cancer risk of trace elements were investigated of these industrial states soils. Results: The mean contents of Cd (0.81 mg/kg), Pb (13.41 mg/kg), Ni (30.14 mg/kg), Zn (53.85 mg/kg) and Cu (14.15 mg/kg) were higher than the uncontaminated background values. The average values of Pb, Ni, Zn and Cu at Ansar industrial site were higher than other industrial sites. Igeo for Cd, Pb, Ni, Zn and Cu were found in the range of 2-2.80, -2.26 3.33, 0.5-2.54, 0.47-2.49 and 0.44-4.01, respectively. The highest non-cancer risk was belonged to Pb (0.3 and 0.01) while the lowest was Zn (0.008 and 0.0002) for child and adult, respectively. Conclusions: Pollution index indicated that industrial estate soils were ‘moderately contaminated’’ or ‘‘moderately to heavily contaminated’’ by Cd, Pb, Ni, Zn and Cu. The noncancer risk levels of sampling sites were lower than the regulatory limits. Also, it can be concluded that, non-cancer risks for adults were lower than children.

Assessment of Accumulation and Human Health Risk of Trace Elements in the Vicinity of Industrial Estates, Central Iran