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Polynuclear aromatic hydrocarbons (PAHs) are amongst the pollutants of main concern in the aquatic ecosystems. They are mostly characterized by mutagenic and carcinogenic effects. Origins and distribution of the 16 PAHs was studied in water and sediments samples which collected from Al-Musharah, Al-Musharah, Al-Batiruh and Al-Kahlaa rivers and three sites along Tigris River namely Ali Al-grbi, Maemal alzuyut and Qulat Salih, in Misan Province. The results revealed the sum concentrations of the 16 PAHs that in water ranging from 1667.15 to 5552.7ng/l in Al-Batiruh and Al-Mijer rivers, respectively. Low Molecular Weight PAHs (LPAHs) levels in the water column were lower than High Molecular Weight PAHs (HPAHs) in all stations except Al-Batiruh River. Also according to our findings, Σ16 PAHs in the sediments was varied from 10365.73 to 28876.2μg/gm.dry weight in Ali Al-grbi station and Al-Kahlaa River, respectively. The concentration of LPAHs in sediment samples was lower than HPAHs at all rivers. The mutagenic equivalent quotient MEQ and toxic equivalent quotient TEQ was generally low except Benzo[k]fluoranthene, Benzo[a]pyrene, Dibenzo[a,h]anthracene, Benzo[g,h,i]perylene and Indeno[1,2,3-c,d] pyrene that were found extremely higher in the sediments of the studied rivers indicating a possible cancer risk to those how perhaps exposed to the river sediments. According to diagnostic ratios of Inpy/(Inpy+BghiP) were more than 0.2 and LPAHs/HPAHs ratios were less than one. These results suggested that the origins of PAHs compounds were derived from pyrolytic origins in water and sediments of the studied rivers.


PAHs River Tigris Pollution.

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JAZZA, S. H., & KHWEDEM, A. A. (2021). Origins and distribution of polynuclear aromatic hydrocarbons (PAHs) in water and sediments of some rivers in Misan Province, Iraq. Iranian Journal of Ichthyology, 8, 46–53. Retrieved from


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