著者

松本 英二 横田 節哉

出版者

日本海洋学会

雑誌

日本海洋学会誌 (ISSN:00298131)

巻号頁・発行日

vol.34, no.3, pp.108-115, 1978-06-30 (Released:2011-06-17)

参考文献数

12

被引用文献数

20

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The accumulation rates of sediment cores in Osaka Bay have been determined by using 210Pb dating technique. In the upper 10 cm 210Pbex contents show a constant value with depth. The accumulation rates below the homogeneous layer of sediments ranging from 0.12 to 0.61 cm y-1 (0.067-0.34 gcm-2y-1) were obtained. The higher contents of Zn, Cu, Pb and Cr were observed in the upper 10 to 30 cm of sediments. Assuming that the increment of heavy metal content in sediments is due to anthropogenic origin, the amount of anthropogenic input of heavy metals into sediments were estimated to be 1, 300-2, 700μg cm-2 for Zn, 150-480 for Cu, 360-410 for Pb and 320-480 for Cr. The increment appears to start about 100 years ago. In surfical sediments most of heavy metal contents exceeded the background content, and thenmost part of Osaka Bay is polluted by heavy metals.