Present environment of Dam Lake Sambe, southwestern Japan : a geochemical study of bottom sediments
Present environment of Dam Lake Sambe, southwestern Japan : a geochemical study of bottom sediments
复制标题
日本西南部桑贝大坝湖的现状：底部沉积物的地球化学研究
DOI：
10.1007/s12665-009-0205-3
复制
发表时间：
2010
影响因子：
2.8
通讯作者：
Fujino T
中科院分区：
文献类型：
--
作者：
Bibi MH;Ahmed F;Ishiga H;Asaeda T;Fujino T
对日本西南部岛根县小田市郊区三部湖的湖床和湖芯沉积物进行了地球化学分析，以评价其水质和16种元素的浓度和分布规律。湖底溶解氧、As、Fe、Mn呈分层分布，夏季呈上升趋势。x射线荧光测定沉积物的化学成分包括主、微量元素（P、Ca、Sc、Ti、V、Cr、Fe、Ni、Cu、Zn、as、Sr、Zr、Pb和Th）和总硫（TS）。As、Zn、V、Fe、P和TS在岩心上部（0 ~ 5 cm）和其他表层沉积物中均有升高。这些金属在湖泊沉积物中丰度的增加可能与沉积物的还原条件、细粒富有机质沉积物和沉积后的成岩再活化有关。此外，沉积物中痕量金属和铁的浓度之间的相关性表明它们吸附在铁（氧）氢氧化物上，而与硫的相关性表明它们以铁硫化物的形式沉淀。砷、铅、锌和铜的平均丰度超过了纽约州环境保护部和加拿大环境部长理事会确定的对水生生物产生中等影响的最低影响水平和临时沉积物质量指南值。此外，砷和锌的浓度超过了沿海海洋沉积物数据库的阈值，表明潜在的有毒水平。因此，湖泊沉积物中微量金属的存在可能对生物群健康产生不利影响。
Geochemical analyses of lakebed and core sediments from Lake Sambe on the outskirts of Oda City in Shimane prefecture in southwestern Japan were carried out in order to assess the water quality and the concentration and distribution patterns of sixteen elements. The lake water showed a stratified condition with respect to dissolved O2, and As, Fe, and Mn concentrations in the bottom layers which increased in the summer. The chemical composition of the sediments, as measured by X-ray fluorescence, included major and trace elements (P, Ca, Sc, Ti, V, Cr, Fe, Ni, Cu, Zn, As, Sr, Zr, Pb, and Th), and total sulfur (TS). Elevated values of As, Zn, V, Fe, P, and TS were present in several layers of the upper cores (from 0 to 5 cm) and other surface sediments. Increases in the abundances of these metals in lake sediments are probably related to the reducing condition of the sediments, fine-grained organic rich sediments, and post-depositional diagenetic remobilization. Moreover, correlations between the concentrations of trace metals and iron in the sediments suggest their adsorption onto Fe (oxy)hydroxides, whereas correlations with sulfur indicate that they were precipitated as Fe-sulfides. The average abundances of As, Pb, Zn, and Cu exceeded the lowest effect level and Interim Sediment Quality Guideline values that the New York State Department of Environmental Conservation and the Canadian Council of Ministers of the Environment determined to have moderate impact on aquatic organisms. In addition, concentrations of As and Zn exceeded the Coastal Ocean Sediment Database threshold value, indicating potentially toxic levels. Therefore, the presence of trace metals in the lake sediments may result in adverse effects on biota health.