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首页> 外文期刊>International Journal of Soil, Sediment and Water >An Ecological Risk-Based Cleanup Strategy for Contaminated Sediments in a Freshwater Brook
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An Ecological Risk-Based Cleanup Strategy for Contaminated Sediments in a Freshwater Brook

机译：一种基于生态风险的淡水溪流沉积物清除策略

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An ecological risk-based approach was used to define the extent of remediation in a brook adjacent to a former manufacturing and assembly plant. Sediment, soil, and surface water contained concentrations of metals, polycyclic aromatic hydrocarbons (PAHs), phthalates, polychlorinated biphenyls (PCBs), and pesticides above sediment quality benchmarks. Samples of sediment were analyzed for metals, 34 individual PAHs, phthalates, PCBs, pesticides, total organic carbon, black carbon, and sediment toxicity using the 42-day Hyalella azteca toxicity test. In addition, freely dissolved concentrations of PAHs in pore water from a subset of samples were determined using a solid phase microextraction (SPME) technique. Concentrations of freely dissolved PAHs in pore water and bioavailable PAHs in sediment were below levels of concern for aquatic organisms. Further evaluations indicated that lead was the contaminant most closely associated with sediment toxicity. A site-specific sediment cleanup level for lead in sediment was developed to define areas for sediment removal in the brook. Using the site-specific sediment cleanup level for lead resulted in a substantially smaller remediation footprint in the brook (24,434 ft2; 2,270 m2) than that originally proposed (64,799 ft2; 6,020 m2) based on exceedance of sediment quality benchmarks.
机译：一种基于生态风险的方法被用于定义与前制造和装配工厂相邻的小溪中的修复程度。沉积物，土壤和地表水中所含金属，多环芳烃（PAHs），邻苯二甲酸盐，多氯联苯（PCBs）和农药的浓度均高于沉积物质量基准。使用为期42天的透明质酸Hyalella Azteca毒性测试，分析了沉积物样品中的金属，34种单独的PAH，邻苯二甲酸盐，PCB，农药，总有机碳，黑碳和沉积物毒性。此外，使用固相微萃取（SPME）技术确定了子集中样品在孔隙水中PAHs的自由溶解浓度​​。孔隙水中自由溶解的PAHs和沉积物中生物可利用的PAHs的浓度低于水生生物关注的水平。进一步的评估表明，铅是与沉积物毒性最密切相关的污染物。建立了针对特定地点的泥沙中铅清除量的水平，以定义溪流中泥沙清除的区域。根据特定的沉积物质量基准，使用特定地点的铅沉积物清理水平导致溪中的修复足迹（24,434平方英尺; 2,270平方米）比原来建议的（64,799平方英尺; 6,020平方米）要小得多。

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