https://scholars.lib.ntu.edu.tw/handle/123456789/356699
標題: | Historical record of heavy metal pollution deduced by lead isotope ratios in core sediments from the Osaka Bay, Japan | 作者: | CHIH-CHIEH SU Hosono, T. Su, CC Okamura, K Taniguchi, M |
關鍵字: | 210Pb dating; Heavy metal; Lead isotope ratio; Osaka Bay; Pollution | 公開日期: | 2010 | 卷: | 107 | 期: | 1 | 起(迄)頁: | 1-8 | 來源出版物: | Journal of Geochemical Exploration | 摘要: | Three marine sediment cores from Osaka Bay were analyzed for 210Pb geochronology, heavy metal concentrations (Zn, Cu, and Pb) and stable lead isotope ratios (206Pb/207Pb) in order to reconstruct high-resolution heavy metal pollution history from 1900-2006. Anthropogenic metal accumulation in sediments peaked in 1970 in agreement with the high economic growth period in Japan. The comparison of temporal patterns of 206Pb/207Pb ratio with other areas of Japan suggested that the heavy metals, imported from several different countries during the periods of economic growth (1955 to 1973), are the main pollution source for the country. For the period 1970-2006, the sediment data reflect the result of stricter environmental regulations applied after the late 1960s. However, heavy metal concentrations in the surface sediments are still elevated to levels several times higher than the levels at the bottoms of the cores. Additionally, the lead isotope ratio does not show significant change after the 1980s. Secondary heavy metal pollution through the mixing of deeper polluted sediment appears to be the likely reason for the deterioration of present time submarine sediment environments. In conclusion, this study has demonstrated that it is difficult to recover over a period of several years the benthic quality of a bay, once it is heavily polluted. © 2010 Elsevier B.V. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-77956191987&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/356699 |
DOI: | 10.1016/j.gexplo.2010.05.003 | SDG/關鍵字: | 210Pb dating; Anthropogenic metals; Core sediments; Economic growths; Heavy metal concentration; Heavy metal pollution; High resolution; Historical records; Lead isotope ratio; Lead isotope ratios; Marine sediments; Osaka Bay; Polluted sediments; Pollution sources; Stable lead isotopes; Surface sediments; Temporal pattern; Economics; Environmental regulations; Geochronology; Isotopes; Lead; Metals; Metamorphic rocks; Pollution; Sedimentology; Sediments; Submarine geology; Zinc; Copper; heavy metal; historical record; isotopic composition; lead isotope; lead-lead dating; marine pollution; marine sediment; sediment pollution; stable isotope; Honshu; Japan; Kinki; Osaka Bay |
顯示於: | 海洋研究所 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。