期刊
CHEMOSPHERE
卷 118, 期 -, 页码 143-147出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2014.07.062
关键词
Lake Victoria; Kisumu; Homa Bay; Polychlorinated dibenzo-p-dioxins; Dibenzofurans; Polychlorinated biphenyls
资金
- Alexander von Humboldt Foundation of Germany
- Peregrine Fund (USA)
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 (Sigma dl-PCBs), 36.6-813 (Sigma PCDDs) and 1.45-46.4 (Sigma PCDFs). The calculated Toxic Equivalents (TEQ(WHO(2005))) ranged from 0.001-0.43 (Sigma dl-PCBs) and 0.09-31 (Sigma PCDD/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 Sigma PCDFs/Sigma PCDDs 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. (c) 2014 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据