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Risk assessment of polychlorinated biphenyls (PCBs) and trace metals in River Nile up- and downstream of a densely populated area.
Omar, Wael A; Mahmoud, Hamada M.
Affiliation
  • Omar WA; Zoology Department, Faculty of Science, Cairo University, Giza, Egypt. ecowael@yahoo.com.
  • Mahmoud HM; Biology Department, Faculty of Science, Taif University, Taif, Saudi Arabia. ecowael@yahoo.com.
Environ Geochem Health ; 39(1): 125-137, 2017 Feb.
Article in En | MEDLINE | ID: mdl-26979054
Cairo city is the largest populated area along the whole course of River Nile with a wide range of anthropogenic activities. Efforts to restore fish habitat and recreational use of the river have raised concerns about its water, sediment and biota quality. This study provides a baseline data on the levels of PCBs and trace metals in River Nile along Cairo sector and implements the formulation of monitoring activities of the river's pollution status. Water, sediment and Nile tilapia (Oreochromis niloticus) samples were collected during summer season, 2013 from two sites, up- and downstream, for detection and determination of 11 PCB congeners (PCBs 28, 44, 52, 70, 101, 105, 118, 138, 152, 180 and 192) as well as six trace metals (Cu, Zn, Mn, Cd, Pb and Fe). Evidences of long- or short-term exposures to these contaminants as well as its accumulation tendency were assessed by integrating the obtained analytical results of biotic and abiotic components of this aquatic ecosystem. All calculated lifetime cancer risk values for PCBs showed unacceptable risk of cancer for human consumers at both normal and subsistence fish consumption rates. The calculated hazard index for total PCBs indicates that fish are not safe for human consumption except in site 1 at normal consumption rate. Meanwhile, trace metals do not pose unacceptable risks at both consumption rates except for Pb in site 1 at subsistence consumption rate.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Trace Elements / Polychlorinated Biphenyls / Risk Assessment / Metals Type of study: Etiology_studies / Risk_factors_studies Limits: Humans Language: En Journal: Environ Geochem Health Journal subject: QUIMICA / SAUDE AMBIENTAL Year: 2017 Document type: Article Affiliation country: Egypt Country of publication: Netherlands

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Trace Elements / Polychlorinated Biphenyls / Risk Assessment / Metals Type of study: Etiology_studies / Risk_factors_studies Limits: Humans Language: En Journal: Environ Geochem Health Journal subject: QUIMICA / SAUDE AMBIENTAL Year: 2017 Document type: Article Affiliation country: Egypt Country of publication: Netherlands