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Dioxin-like PCBs and PCDD/Fs in surface sediments near the shore of Winam Gulf, Lake Victoria

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dc.contributor.author Omwoma, Solomon
dc.contributor.author Lalah, Joseph O
dc.contributor.author Virani, Munir
dc.contributor.author Schramm, Karl-Werner
dc.contributor.author Henkelmann, Bernhard
dc.date.accessioned 2015-06-03T10:27:09Z
dc.date.available 2015-06-03T10:27:09Z
dc.date.issued 2015
dc.identifier.citation Chemosphere Volume 118, January 2015, Pages 143–147 en_US
dc.identifier.uri http://www.sciencedirect.com/science/article/pii/S0045653514009254
dc.identifier.uri http://hdl.handle.net/123456789/1281
dc.description.abstract Winam Gulf of Lake Victoria is considered to be contaminated with toxic chemicals emanating from anthropogenic activities, especially near large industrial towns such as Kisumu. This has recently caused concerns about its water quality and impact on aquatic organisms and human beings. This study was justified by the need to generate baseline concentrations of polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs) and dioxin-like polychlorinated biphenyls (dl-PCBs) in surface sediment from selected sites in the lake and determine the influence of activities on their concentrations and potential risks to fish-eating birds living near the lake. Surface sediments (<30 cm) from three different fish landing beaches, located 200 m from the shore of Winam Gulf of Lake Victoria near Kisumu city, Homa Bay and Mbita (control) towns, were analysed. The total mean concentrations (in pg g−1 dry wt) were found to range from 17.4–812 (Σdl-PCBs), 36.6–813 (ΣPCDDs) and 1.45–46.4 (ΣPCDFs). The calculated Toxic Equivalents (TEQWHO(2005)) ranged from 0.001–0.43 (Σdl-PCBs) and 0.09–31 (ΣPCDD/Fs). The fish landing beaches at Kisumu city were found to be contaminated with respect to dl-PCBs and dioxins, followed by Homa Bay and Mbita. The relatively high levels of octachlorodibenzo-p-dioxin (OCDD) and octachlorodibenzofuran (OCDF) influenced the TEQ and the ΣPCDFs/ΣPCDDs ratios indicated chemical processes as partial sources of the dioxins. The levels of contaminants obtained in this study showed potential exposure to aquatic organisms and fish eating birds through food chain transfer en_US
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.subject Lake Victoria en_US
dc.subject Kisumu en_US
dc.subject Homa Bay en_US
dc.subject Polychlorinated dibenzo-p-dioxins en_US
dc.subject Dibenzofurans en_US
dc.subject Polychlorinated biphenyls en_US
dc.title Dioxin-like PCBs and PCDD/Fs in surface sediments near the shore of Winam Gulf, Lake Victoria en_US
dc.type Article en_US

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