Journal of Natural Environment

Determining the allowable rate of Oncorhynchus mykiss fish consumption in terms of heavy metals in rivers of Khash city

Document Type : Research Paper

Authors

1 Judgment

2 PhD graduated ,Department of Environmental Science, Faculty of Natural Resources, Tarbiat Modares University, Noor, Iran

3 Univercity of tarbiat modares

Abstract

Heavy metals are one of the main groups of environmental pollutants; enter the aquatic environment through natural and human activities. These metals may accumulate in aquatic organisms including fish and be a potential danger to the health of the ecosystem and living organisms, especially for human beings. In the present study, the concentration of heavy metals (Zn, Cu, Pb and Ni) were measured in the muscle tissue of Oncorhynchus mykiss fish in three stations (Dehpabid, Bidaster and Eskalabad) of Khash city in spring 2019. After preparation and chemical digestion of fish tissue, the amounts of heavy metals studied were determined by the atomic absorption. The results of this study showed that the highest rate of accumulation in all stations studied was related to Zn> Cu> Pb >Ni, respectively. Average amount of heavy metal accumulation was compared within the international standards of WHO, FDA, NHMRC, FAO, UKMAFF and USEPA. The toxicity of heavy metals Zn, Cu and Pb were lower than the permitted concentration of international standards. According to the results, only nickel metal was close to the WHO standard limit in the Bidaster and Eskel Abad samples, indicating that more control should be carried out on the production resources this metal around the regions studied. Also, the daily absorption rates of the studied metals (EDI) for children and adults were lower than the reference dose set by the EPA and the TI provided by the FAO/WHO Organization. The results of this study showed that the consumption of Oncorhynchus mykiss fish was considered hygienically suitable for human consumption, but due to the bioaccumulation and toxicity of heavy metals, it is necessary to study risk assessment, considering all its possible routes exposure in these regions.

Keywords

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Journal of Natural Environment
Volume 73, Issue 4
March 2021
Pages 665-675