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  • Title: [Analysis of the source, potential biological toxicity of heavy metals in the surface sediments from shellfish culture mudflats of Rudong Country, Jiangsu Province].
    Author: Li L, Wang YL, Jiang M, Yuan Q, Shen XQ.
    Journal: Huan Jing Ke Xue; 2012 Aug; 33(8):2607-13. PubMed ID: 23213880.
    Abstract:
    Concentrations of six heavy metals were measured in the surface sediments from shellfish culture mudflats of Rudong Country, Jiangsu Province in 2010. The geo-accumulation index (Igeo) was employed to evaluate the pollution level of heavy metals and the results showed that the heavy metal contamination could be divided into three groups: no contamination (Igeo), as in the case of Cu, Cd, Hg; light to moderate contamination (0 < Igeo, < 1), as in the case of Pb, As; and moderate contamination (1 < Igeo, < 2), as in the case of Zn. The pollution level of heavy metals followed the order of Zn > As > Pb > Cd > Cu > Hg. The potential biological toxicity was analyzed using sediment quality guidelines (SQG), as the guideline values, Cd showed no potential biological toxicity, As showed occasional potential biological toxicity in all sampling stations, Cu, Pb, Zn, Hg showed potential biological toxicity in some sampling stations, whereas Zn was the only one showing frequent potential biological toxicity in some sampling stations. Sigma TUs revealed that only one of the sampling stations showed significant acute toxicity, whereas the others showed no acute toxicity. Analysis of heavy metal contamination source through principal component analysis (PCA) revealed that the contribution rates of the top two principal components were 37.56% and 33.71%, respectively, indicating that the two main sources of heavy metals were industrial waste water and pollution from transportation and shipping.
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