Volume 17, Issue 4 (3-2025)
ijhe 2025, 17(4): 673-690 |
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Asadi I, Cheraghi M, Lorestani B, Merrikhpour H, Sobhanardakani S. Chemical speciation and bioavailability of potentially toxic elements in agricultural soils (case study: south of Hamedan province). ijhe 2025; 17 (4) :673-690
URL: http://ijhe.tums.ac.ir/article-1-6977-en.html
URL: http://ijhe.tums.ac.ir/article-1-6977-en.html
Iraj Asadi1 
, Mehrdad Cheraghi * 2, Bahareh Lorestani1 , Hajar Merrikhpour3 , Soheil Sobhanardakani1
, Mehrdad Cheraghi * 2, Bahareh Lorestani1 , Hajar Merrikhpour3 , Soheil Sobhanardakani1
1- Department of the Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran
2- Department of the Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran ,cheraghi@iauh.ac.ir
3- Department of Water, Wastewater and Environmental Engineering, Civil, Water and Environmental Engineering Faculty, Shahid Beheshti University, Tehran, Iran AND Department of Agricultural Sciences, Agriculture Faculty, Sayyed Jamaleddin Asadabadi University, Asadabad, Iran
2- Department of the Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran ,
3- Department of Water, Wastewater and Environmental Engineering, Civil, Water and Environmental Engineering Faculty, Shahid Beheshti University, Tehran, Iran AND Department of Agricultural Sciences, Agriculture Faculty, Sayyed Jamaleddin Asadabadi University, Asadabad, Iran
Abstract: (49 Views)
Background and Objective: Evaluating the chemical speciation and bioavailability of heavy metals, along with identifying the effective parameters influencing their bioavailability, plays a key role in soil management and the improvement of agricultural lands. Therefore, this research was conducted to determine the origin, chemical speciation, and bioavailability of potentially toxic elements (PTEs) in the agricultural soils of the southern cities of Hamedan province.
Materials and Methods: In this study, 90 surface soil samples were randomly collected from a depth of 0–20 cm in agricultural lands. After preparing the samples in the laboratory, the elemental content was measured using an atomic absorption device. Texture characteristics, acidity (pH), salinity (EC), calcium carbonate content, organic matter, and exchangeable cations were determined using methods proposed by the Environmental Protection Organization. The relationships between the bioavailability of heavy metals and these characteristics were investigated using Spearman's correlation test.
Results: The average concentrations of manganese, cadmium, iron, cobalt, chromium, copper, nickel, antimony, and arsenic in the three studied cities were 267.63, 0.19, 4.20, 20.65, 90.49, 35.86, 70.84, 3.78, and 17.82 mg/kg, respectively. Sequential extraction results showed that manganese, copper, and nickel had the highest bioavailability, with concentrations of 6.76, 2.91, and 3.77 mg/kg, respectively. More than 70% of the bonds between heavy metals and soil were in resistant and residual fractions, indicating that heavy metals in the soil have a natural background.
Conclusion: The bioavailability of heavy metals in the soil environment is low, suggesting minimal potential for these metals to enter water, soil, and crops, and thus does not pose significant concern.
Materials and Methods: In this study, 90 surface soil samples were randomly collected from a depth of 0–20 cm in agricultural lands. After preparing the samples in the laboratory, the elemental content was measured using an atomic absorption device. Texture characteristics, acidity (pH), salinity (EC), calcium carbonate content, organic matter, and exchangeable cations were determined using methods proposed by the Environmental Protection Organization. The relationships between the bioavailability of heavy metals and these characteristics were investigated using Spearman's correlation test.
Results: The average concentrations of manganese, cadmium, iron, cobalt, chromium, copper, nickel, antimony, and arsenic in the three studied cities were 267.63, 0.19, 4.20, 20.65, 90.49, 35.86, 70.84, 3.78, and 17.82 mg/kg, respectively. Sequential extraction results showed that manganese, copper, and nickel had the highest bioavailability, with concentrations of 6.76, 2.91, and 3.77 mg/kg, respectively. More than 70% of the bonds between heavy metals and soil were in resistant and residual fractions, indicating that heavy metals in the soil have a natural background.
Conclusion: The bioavailability of heavy metals in the soil environment is low, suggesting minimal potential for these metals to enter water, soil, and crops, and thus does not pose significant concern.
Type of Study: Research |
Subject:
General
Received: 2024/09/3 | Accepted: 2024/12/22 | Published: 2025/03/8
Received: 2024/09/3 | Accepted: 2024/12/22 | Published: 2025/03/8
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