堆積物と海水からの海産多毛類への115mCdの移行の比較

概要

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To know the role played by marine sediments in influencing the fate of discharged metals, (1) the interaction of metals between sediments and deposit-feeder marine worms (Nereis japonica), and (2) uptake and excretion of metals by worms were examined by laboratory ex-periments using 115mCd. Worms directly in contact with 115mCd-sediments accumulated 115mCd six times more than worms that were not in contact with the 115mCd sediments during the 8 days of experimentation and 12% of 115mCd in sediments were noted to be transfered to worms per unit. Comparing the concentration factor of 22 (from sea water) with accumula-tion from sediments, it was assumed that 115mCd in sediments would give the effect of 1/200 to the accumulation of 115mCd by worms in sea water to the accumulation of 115mCd. Further, to simulate these results close to that occuring in the natural ecosystem, the distribution of 115mCd in sea water, sediments and alga were also examined by means of a curve analysis of 115mCd were 9 for sediments and 21 for alga, which was similar to 22 for worms.
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