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首页> 外文期刊>Chemosphere >Runoff effect on eutrophic lake water quality and heavy metal distribution in recent littoral sediment
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Runoff effect on eutrophic lake water quality and heavy metal distribution in recent littoral sediment

机译：径流对近岸沉积物富营养化湖泊水质和重金属分布的影响

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摘要

Multivariate statistical methods (hierarchical clustering analysis: HCA, and principal component analysis: PCA) were used to study the influence of runoff and other diffuse pollution sources on lake water chemistry of Hough Park lake in Central Missouri. In addition, heavy metal concentrations in lake littoral sediment were evaluated for enrichment and probable ecological risk. The abundance of macronutrients in the lake water column followed the order: Ca > Mg > TIC > K > Na > S > NO_3 - N > Fe > NH_3 - N > TP. Heavy metal concentrations in the lake water column were below acute and chronic level ecological guidelines. TN:TP ratios (range: 4.1-6.8) revealed nitrogen limitation of algal and other photosynthetic plant growth. The HCA showed two major clusters of similarity between the sampling points suggesting different pollution levels for the clusters. PCA 1, 2 and 3 reflected the influence of natural biochemical processes, atmospheric deposition and runoff respectively on lake water chemistry. The abundance of heavy metals and the normalizing element (Li) in littoral sediment (<63 urn fraction) samples analyzed in decreasing order were: Mn > Zn > Cr > Ni > Li > Cu > Pb > Cd > Hg. The average concentration of Cr, Mn and Ni in littoral sediment fraction exceeded the respective lowest effects level (LEL) threshold limit. Metal bioavailability in sediment fraction was low since the most labile metal species contained between 0% and 11% of the total metal content. Using the risk assessment code (RAC) criteria, only Mn posed a medium risk to the lake system.
机译：采用多元统计方法（层次聚类分析：HCA，主成分分析：PCA）研究径流和其他弥散性污染源对密苏里州中部霍夫公园湖水化学的影响。此外，还评估了湖滨沉积物中重金属的含量，以评估其富集性和可能的​​生态风险。湖水柱中大量营养元素的含量顺序为：Ca> Mg> TIC> K> Na> S> NO_3-N> Fe> NH_3-N> TP。湖水柱中的重金属浓度低于急性和慢性水平的生态准则。 TN：TP比（范围：4.1-6.8）显示了藻类和其他光合植物生长的氮限制。 HCA显示了两个主要的采样点相似性集群，表明这些集群的污染水平不同。 PCA 1、2和3分别反映了自然生化过程，大气沉积和径流对湖泊水化学的影响。沿海地区沉积物中（<63 urn分数）样品中重金属含量和归一化元素（Li）的含量按降序分析：Mn> Zn> Cr> Ni> Li> Cu> Pb> Cd> Hg。沿海沉积物部分中Cr，Mn和Ni的平均浓度超过了各自的最低影响水平（LEL）阈值极限。沉积物中金属的生物利用度较低，因为最不稳定的金属种类占总金属含量的0％至11％。使用风险评估代码（RAC）标准，只有Mn对湖泊系统构成中等风险。

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  • 来源
    《Chemosphere》 |2011年第2期|p.259-267|共9页
  • 作者

    A. Ikem; S. Adisa;

  • 作者单位

    Department of Agriculture and Environmental Sciences, Lincoln University, 904 Chestnut Street, Jefferson City, MO 65101, USA;

    Department of Agriculture and Environmental Sciences, Lincoln University, 904 Chestnut Street, Jefferson City, MO 65101, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    runoff; lake water quality; heavy metals; metal distribution; sediment quality guidelines (SQGs);

    机译：径流;湖泊水质;重金属;金属分布;沉积物质量准则（SQG）;

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