Sedimentation rate and heavy metal pollution in sediments in Harima Nada (Harima Sound), Seto Inland Sea |
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| Authors: | Akira Hoshika Takayuki Shiozawa Eiji Matsumoto |
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| Institution: | (1) Government Industrial Research Institute, Chugoku, 15000 Hiromachi, 737-01 Kure, Japan;(2) Geological Survey of Japan, Higashi 1-1-3, Yatabe, Tsukuba, 305 Ibaragi, Japan |
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| Abstract: | Sedimentation rates were determined with the210Pb technique in six sediment cores from Harima Nada (Harima Sound), Seto Inland Sea. The rate of deposition varies from 0.11 g cm–2y–1 in the northern part to 0.33 g cm–2 y–1 in the southern part of the basin. A marked increase in copper and zinc content was observed above a depth in the core corresponding to about 1900 A.D. as a result of increasing human activities. Anthropogenic input of copper and zinc decreased slightly after 1970. Natural background levels of copper and zinc in the sediment in this sound are 11–16 ppm and 100–120 ppm, respectively. The total amounts of anthropogenic copper and zinc in the sediments were estimated to be 110–180 g cm–2 and 610–1,280g cm–2, respectively. These values constitute 40–50% of the total sedimentary input of copper and zinc in the sediments since about 1900 A.D. |
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