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首页> 外文期刊>Biological trace element research >Ecological risks assessment and pollution source identification of trace elements in contaminated sediments from the Pearl River Delta, China
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Ecological risks assessment and pollution source identification of trace elements in contaminated sediments from the Pearl River Delta, China

机译：珠江三角洲受污染沉积物中微量元素的生态风险评估和污染源识别

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Sediments from 14 stations in the Foshan Waterway, a river crossing the industrial district of Guangdong Province, South China, were sampled and subsequently analyzed. The 14 stations were selected for the pollution discharging features of the river, such as the hydrology, the distribution of pollution sources, and the locations of wastewater outlets. The ecological risks were assessed, and the pollution sources were identified to provide valuable information for environmental impact assessment and pollution control. The spatial variability was high and the range were (in milligrams per kilogram dry weight): Pb, 46.0～382.8; Cu, 33.7～ 482.3; Zn, 62.2～1,568.7; Ni, 28.5～130.7; Cr, 34.7～1,656.1; Cd, 0.50～8.53; Hg, 0.02～8.27; and As, 5.77～66.09. The evaluation results of enrichment factor and potential ecological risk index indicate that the metal pollution in the surface and bottom sediments were severely polluted and could pose serious threat to the ecosystem in most stations. Although the hazard levels of the trace element differed among the stations, Hg was the most serious pollutant in all stations. The results of principal component analysis (PCA) show that the discharge of industrial wastewater is the most important polluting factor whereas domestic sewage, which contains a large amount of organic substances, accelerates metal deposition. And potential pollution sources were identified by the way of integrating the analysis results of PCA and data gained from the local government. Therefore, the conclusion is drawn that Foshan Waterway is seriously polluted with trace elements, both in the surface sediment (0 to 20 cm) and the bottom sediments (21 to 50 cm) are contaminated.
机译：采样并分析了佛山水道（穿越中国广东省工业区的一条河流）的14个站点的沉积物。选择了14个站，用于河流的水排放特征，例如水文，污染源的分布以及废水出口的位置。评估生态风险，确定污染源，为环境影响评估和污染控制提供有价值的信息。空间变异性高，范围（以毫克/千克干重计）：Pb，46.0〜382.8;铜，33.7〜482.3;锌，62.2〜1,568.7;镍28.5〜130.7;铬，34.7〜1,656.1;镉0.50〜8.53;汞0.02〜8.27;并且，5.77〜66.09。富集因子和潜在生态风险指数的评估结果表明，大多数站点的表层和底部沉积物中的金属污染受到严重污染，可能对生态系统构成严重威胁。尽管各站的微量元素危害水平不同，但汞是所有站中最严重的污染物。主成分分析（PCA）的结果表明，工业废水的排放是最重要的污染因素，而包含大量有机物质的生活污水则加速了金属沉积。通过将五氯苯甲醚的分析结果与地方政府提供的数据相结合，确定了潜在的污染源。因此，可以得出结论，佛山水道的表层沉积物（0至20 cm）和底部沉积物（21至50 cm）均受到微量元素的严重污染。

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