Evaluation of Heavy Metal Contamination and Ecological Risk Assessment in Sediments of Karun using Aquatic Pollution Indices

Hedayatzadeh, Fariba; Hassanzadeh, Nasrin

doi:10.29252/ArchHygSci.9.1.10

Volume 9, Issue 1 (Winter 2020) Arch Hyg Sci 2020, 9(1): 10-26 | Back to browse issues page

‎ 10.29252/ArchHygSci.9.1.10

‎ 20.1001.1.22519203.2020.9.1.1.8

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Hedayatzadeh F, Hassanzadeh N. Evaluation of Heavy Metal Contamination and Ecological Risk Assessment in Sediments of Karun using Aquatic Pollution Indices. Arch Hyg Sci 2020; 9 (1) :10-26
URL: http://jhygiene.muq.ac.ir/article-1-435-en.html

Evaluation of Heavy Metal Contamination and Ecological Risk Assessment in Sediments of Karun using Aquatic Pollution Indices

Fariba Hedayatzadeh¹

, Nasrin Hassanzadeh ^*

1- a PhD Candidate of Environment, Department of Environmental Science, Faculty of Natural Resources and Environment, Malayer University, Malayer, Iran
2- Assistant Professor, Department of Environmental Science, Faculty of Natural Resources and Environment, Malayer University, Malayer, Iran

Abstract: (3321 Views)

Background & Aims of the Study: The current study was designed to determine the quality of sediments in Karun in Ahvaz, Iran, according to aquatic pollution indices.
Materials and Methods: The sediment samples were obtained from six river stations in summer and winter. The sediment samples were air-dried, sifted, homogenized, and stored in plastic bags, and the concentrations of metals were determined in the laboratory.
Results: The obtained findings revealed that the mean concentrations of lead, zinc, chrome, and cadmium were 26.27, 72.36, 53.47, and 3.85 mg/kg dw in summer and 13.41, 59.54, 30.28, and 0.42 mg/kg dw in winter, respectively. According to the mean scores of the potential ecological risk index (PERI), in two seasons, the sediment enrichment with metals was observed in the order of Cd > Pb > Cr > Zn; however, according to biological toxicity test (the effects range-median quotient), the sequences of the metals during summer and winter were Cd > Cr > Zn > Pb and Zn > Cr > Pb > Cd, respectively. The comparison of indices between stations showed that in summer, stations 3 and 4 were medium-low priority side according to the mean effects range-median quotient (mERM-Q) and were reported with moderate ecological risk based on the PERI. In winter, stations 2 and 4 had a medium-low priority side and moderate ecological risk according to mERM-Q and PERI, respectively. The results of hazard quotient (HQ) and modified hazard quotient also showed that the HQ values of Pb and Zn (0.1

Conclusion: Based on all the indices, station 4 was the most contaminated site, and Cd was reported with the highest risk. Therefore, entering the wastewater canal and input contaminants, especially cadmium into Karun can be regarded as a major concern.

Keywords: Sediment, Heavy metals, Potential Ecological Risk Index (R), Biological Risk Index (mERM-Q), Hazard quotient (HQ), Karun River

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Type of Study: Original Article | Subject: Environmental Health
Received: 2019/12/22 | Accepted: 2020/02/3 | Published: 2020/03/29

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