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| Spatial distribution of ecological risk of polycyclic aromatic hydrocarbons in the surface waters of Lake Taihu. |
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Abstract On the basis of PAHs concentrations in Meiliang Bay, Gonghu Bay and Xukou Bay of Taihu Lake, potentially affected fractions of PAHs to aquatic organisms in Lake Taihu were calculated using species sensitivity distribution.Spatial distribution of ecological risk were mapped using geographical information system. The ecological risk of PAHs to aquatic organisms was in the order of Flua (1.1641%), Phe (0.2206%), Pyr (0.1633%), BaP (0.0175%), Ant (0.0021%), Flu (0.0005%), Ace (0.0000%). The combined ecological risk caused by ∑7PAH was higher than that from individual PAHs. Ecological risks of Ant, BaP and ∑7PAH to aquatic organisms in Meiliang Bay (0.0209%, 0.1237%, and 4.1018%) were significantly higher than those in Gonghu and Xukou Bay, while there was no significant difference between ecological risks in Gonghu Bay (0.0023%, 0.0085%, and 3.0414%)and Xukou Bay(0.0002%, 0.0015%, and 2.3899%). Ecological risks of Flu and Phe in Xukou Bay (0.0004%, 0.1553%)were significantly lower than those in Meiliang Bay (0.0011%, 0.2999%) and Gonghu Bay (0.0009%, 0.2681%), whereas there was no significant difference in ecological risks from Flu and Phe in Meiliang Bay and Gonghu Bay. Ecological risks of Pyr and Flua in Meiliang Bay(0.3268%和1.7156%), Gonghu Bay (0.1697%, 1.2386%) and Xukou Bay (0.1044%, 0.8339%) were significantly different from each other. The maps of spatial distribution of ecological risk produced by the distance inverse weight method demonstrated that the distribution characteristics of ecological risks from several individual PAHs and ∑7PAH in three bays of Lake Taihu were similar, and the ecological risk of PAHs to all the aquatic organisms in descending order of Northwestern Meiliang Bay, Northern Gonghu Bay and Xukou Bay.
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Received: 01 September 2011
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