Prioritizing the Amount of Contamination of Metals Using Pollution Load Factors and Potential Biologic Hazards in the Surface Sediments of the Rivers of the Southeast Coast of the Caspian Sea

Subject Areas : sediment

Sahabeh talesh pour ¹ , Lobat taghavi ² , Nasrollahzadeh Saravi ³

1 - Ph.D Student, Department of Environmental Science, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran
2 - Associate Professor, Department of Environmental Science, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran* (Correspondent)
3 - Caspian Sea Ecology Institute, Fisheries Research Institute of Iran, Organization for Research, Education and Promotion of Agriculture, Sari, Iran

Received: 2017-01-14 Accepted : 2017-08-30 Published : 2020-08-22

Keywords: Metal elements, Caspian Sea, rivers, Pollution indicators, Sediment,

Abstract :

Abstract: Sediments are the most important storage and uptake of metals and other pollutants in aquatic ecosystems and can reflect the quality of aquatic systems. In this study, sediment contamination to zinc, copper, lead and cadmium metals based on pollution index (PLI) and evaluation of metal element hazards on living organisms based on biological hazard potential index (MERMQ) in surface sediments of rivers in the southeast coast of the Caspian Sea was performed. Methods: In order to measure and determine the indicators of metal pollution, sampling of surface sediments of the estuary and a distance of 1000 meters from the estuary of some rivers on the southeastern shores of the Caspian Sea including Gorganrood, Qarahsu, Nekaroudeh, Tajna, Talar and Babolrood was performed. Samples were prepared in the laboratory using a mixture of three nitric acids, fluoride and hydrochloric acid and then analyzed by atomic absorption spectrometry. Results: The results of the present study indicate that the MERMQ index of metallic elements in the sediments of rivers on the southern shores of the Caspian Sea ranged from 0.073 to 0.12 and the PLI pollution index ranged from 0.36 to 0.58. The results of comparing the concentration of metals in surface sediment samples with the sediment quality standard (NOAA) showed that in all studied stations the amount of measured elements is less than the amount of ERL. Conclusion: Results of MERMQ for sediments demonstrated that in estuaries of Gharesou and Talar river and 1000 metres from Babolroud, the prioritization of biological hazards is in low to medium level and in other stations in the study is in low level. Besides, the results of PLI in sediments Indicated that level of sediments’ pollution to heavy metals is in low level.

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