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| Residual characteristics and ecological risk assessment of polychlorinated biphenyls (PCBs) in the surface sediments of Dishui Lake watershed |
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Abstract Dishui Lake is the largest artificial lake in China. Polychlorinated biphenyls (PCBs) were measured bimonthly in sediments from Dishui Lake watershed in 2012. Total concentrations of 7PCBs increased gradually in the flowing river, while fluctuated slightly inside the lake. The spatial distribution showed that PCBs outside the diversion sluice [(844.74±687.62)ng/g] was higher than that inside the diversion sluice [(516.83±645.45)ng/g], and both were much higher than that in Dishui Lake [(81.63±72.18)ng/g]. Judged by principal component analysis method, the possible sources included import capacitor migration (43%), paint additive pollution (33%) and domestic capacitor and transformer pollution (11%). The ecological risk assessment indicated that biological toxicity effect of PCBs was serious in the flowing river, whereas Dishui Lake had potential hazards. Compared with other studies, PCBs contaminated sediments in the flowing rivers were in a serious pollution level, while Dishui Lake was considered in a medium pollution level.
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Received: 31 October 2013
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