Heavy metal pollution of bottom sediments.
The horizontal and vertical distributions of chromium, zinc, copper, lead and nickel in the sediments in Osaka Bay were determined. Judging from the results of the sedimentation rates determined by 210 Pb dating technique, the pollution of the sediments by these heavy metals seemed to have been occurring since about 1900 -1930. The concentration of these heavy metals at each sampling station was constant in the deeper part of the vertical distribution. This constant value was taken as the background concentration at each station considering the sedimentation rate. The amounts of artificial accumulation of these heavy metals were estimated at each station by integrating the values which exceeded the background concentrations. These values were 0-1,800 for chromium, 0-12,000 for zinc, 0-2,100 for copper, 0-3,300 for lead, and 0 140 for nickel in units of 11 g/cm2 respectively. Moreover they were higher at the head part of the bay. From the horizontal distribution of these values, the total amounts of artificial accumulation of the heavy metals in Osaka Bay were respectively found to be 4,400 tons for chromium, 30,000 for zinc, 5,900 for copper, 7,800 for lead, and 400 for nickel. These values were nearly equal to the values of Tokyo Bay, but were several times higher than the values of Ise Bay except the one for nickel. Key words：Pollution,Heavy Metal, Osaka Bay, 210 Pb.
| Main Authors: | , , , , , |
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| Format: | Journal Contribution biblioteca |
| Language: | Japanese |
| Published: |
1983
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| Online Access: | http://hdl.handle.net/1834/16223 |
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