Recent sedimentary environment of coastal lagoon in southwestern Japan: evidence from major and trace elements.
Recent sedimentary environment of coastal lagoon in southwestern Japan: evidence from major and trace elements.
复制标题
日本西南部沿海泻湖的近期沉积环境：来自常量元素和微量元素的证据。
DOI：
10.1007/s10661-010-1379-6
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
and B. P. Roser
中科院分区：
文献类型：
--
作者：
F. Ahmed;M. H. Bibi;K. Seto;H. Ishiga;T.Fukushima;and B. P. Roser
对日本西南部的新知湖和大桥河的底部沉积物进行了地球化学研究，以确定其元素组成，并采用富集因子（EF）、污染负荷指数（PLI）和地累积指数（Igeo）评价湖泊沉积物的污染状况。目前的水质也进行了评估。结果表明，新寺湖的水质在上、下两部分之间略有差异。沉积物的化学成分，通过X射线荧光测量，包括主要和微量元素和总硫（TS）。As，Pb，Zn，Cu，Ni和Cr的平均丰度分别为10，29，143，27，19和54 ppm，相比之下，河流沉积物中的6，18，57，16，10和37 ppm。基于EF、PLI和Igeo，湖泊沉积物中As为中度至重度污染，Pb、Zn和Cr为中度污染，Cu和Ni未受污染。湖泊沉积物中As、Pb和Zn的高EF和Igeofor表明在新寺发生了金属富集。这些金属丰度的增加可能与沉积物的细粒性质、底部沉积物的还原条件、有机物的富集以及非点源人为来源的微小贡献有关。微量金属含量与Fe2O3和TS有很强的相关性，表明铁的氧化物和硫化物在调查区域的丰度起着控制作用。
A geochemical study of the bottom sediments of Lake Shinji and the River Ohashi in southwestern Japan was carried out to determine their elemental compositions and to evaluate the pollution status of lake sediments by employing enrichment factor (EF), pollution load index (PLI), and geoaccumulation index (Igeo). Present-day water quality was also assessed. Results showed that the water quality of Lake Shinji contrasts slightly between the upper and lower parts. The chemical composition of the sediments, as measured by X-ray fluorescence, included major and trace elements and total sulfur (TS). Average abundances of As, Pb, Zn, Cu, Ni, and Cr in the Shinji sediments were 10, 29, 143, 27, 19, and 54 ppm, respectively, compared to 6, 18, 57, 16, 10, and 37 ppm in the river sediments. Based on the EF, PLI, andIgeo, the lake sediments are moderately to strongly polluted with respect to As, moderately polluted with Pb, Zn, and Cr, and unpolluted with Cu and Ni. The high EF andIgeofor As, Pb, and Zn in the lake sediments indicate that metal concentration has occurred in Shinji. Increases in the abundances of these metals are likely related to the fine-grained nature of the sediments, reducing conditions of the bottom sediments, enrichment in organic matter, and possibly a minor contribution from non-point anthropogenic sources. Trace metal contents are strongly correlated with Fe2O3and TS, suggesting that Fe oxides and sulfides play a role in controlling abundances in the investigated areas.