Abundances, distribution, and sources of trace metals in Nakaumi-Honjo coastal lagoon sediments, Japan

被引:23
作者
Ahmed, Faruque [1 ]
Bibi, M. Hawa [2 ]
Seto, Koji [3 ]
Ishiga, Hiroaki [4 ]
Fukushima, Takehiko [1 ]
Roser, Barry P. [4 ]
机构
[1] Univ Tsukuba, Grad Sch Life & Environm Sci, Tsukuba, Ibaraki 3058572, Japan
[2] Saitama Univ, Dept Environm Sci & Technol, Saitama 3388570, Japan
[3] Shimane Univ, Res Ctr Coastal Lagoon Environm, Matsue, Shimane 6908504, Japan
[4] Shimane Univ, Dept Geosci, Matsue, Shimane 6908504, Japan
关键词
Coastal lagoon sediment; Geochemistry; Trace metals; Environmental guidelines; Southwest Japan; FRESHLY DEPOSITED SEDIMENTS; HEAVY-METALS; SOUTHWEST JAPAN; LAKE-SEDIMENTS; SANIN DISTRICT; WATER-QUALITY; GOMATI RIVER; RECORD; CONTAMINATION; POLLUTION;
D O I
10.1007/s10661-009-1065-8
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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.
引用
收藏
页码:473 / 491
页数:19
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