Abundances, distribution, and sources of trace metals in Nakaumi-Honjo coastal lagoon sediments, Japan
Abundances, distribution, and sources of trace metals in Nakaumi-Honjo coastal lagoon sediments, Japan
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DOI：
10.1007/s10661-009-1065-8
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发表时间：
2010-08-01
影响因子：
3
通讯作者：
Roser, Barry P.
中科院分区：
文献类型：
--
作者：
Ahmed, Faruque;Bibi, M. Hawa;Roser, Barry P.
对日本西南部Nakaumi泻湖和Honjo地区的底部沉积物进行了分析，以确定其地球化学成分，并通过与沉积物质量指南进行比较来评估潜在影响。目前的水质也进行了评估。结果表明，中海泻湖和本庄地区的水质在其上部和下部之间存在差异。As，Pb，Zn，Cu，Ni和Cr在Nakaumi沉积物中的平均丰度分别为12，25，135，32，21和46 ppm，而在本庄地区为10，24，110，26，20和38 ppm。所有的平均值都大于上大陆地壳的平均值。金属浓度的升高可能与沉积物的细粒性质有关，减少了丰富的有机物和可能的轻微非点源人为源产生的底部条件。微量金属含量与Fe2O3密切相关，表明铁氧化物在控制丰度中起作用。金属浓度超过NYSDEC最低效应水平和CCME临时沉积物质量准则，表明对水生生物有中度影响。As和Zn的平均丰度与沿海海洋沉积物数据库阈值相当，而最大浓度超过该值，表明这些金属的浓度具有潜在毒性。这些富集情况表明，即使在不存在金属污染点源的情况下，也可能需要进行定期监测。
Bottom sediments from Nakaumi Lagoon and the Honjo Area in southwest Japan were analyzed to determine their geochemical compositions and to assess potential impacts by comparison with sediment quality guidelines. Present-day water quality was also assessed. Results showed that the water quality of Nakaumi Lagoon and the Honjo area contrasts between their upper and lower parts. Average abundances of As, Pb, Zn, Cu, Ni, and Cr in the Nakaumi sediments were 12, 25, 135, 32, 21, and 46 ppm, respectively, compared to 10, 24, 110, 26, 20, and 38 ppm in the Honjo area. All averages are greater than those of the upper continental crust. The elevated metal concentrations are probably related to the fine-grained nature of the sediments, reducing bottom conditions produced by abundant organic matter and possibly minor non-point anthropogenic sources. Trace metal contents are strongly correlated with Fe2O3, suggesting that Fe oxides play a role in controlling abundances. Metal concentrations exceed the NYSDEC lowest effect level and CCME interim sediment quality guidelines that indicate moderate impact on aquatic organisms. Average abundances of As and Zn are comparable to the Coastal Ocean Sediment Database threshold, whereas maximum concentrations exceed that value, indicating that the concentrations of these metals are potentially toxic. These enrichments suggest that regular monitoring may be desirable even where no point sources of metal pollution exist.