The effect of lead on the filtration rate of the zebra musselDreissena polymorpha was investigated, together with the accumulation of Pb in the soft tissues of the mussels. The NOEC-filtration was 116 μg.l−1 (0,56 μmol.l−1) and the EC50-filtration was 370 μg.l−1 (1.79 μmol.l−1). The NOEC-accumulation was the concentration found in the control water (1.4μg.l−1). These experiments show that the EC50-filtration for Pb is similar to that for Cd, higher than that for Cu and lower than that for Zn. The water quality criteria for lead allow 25 μg Pb.l−1 in surface water. This will not cause short-term effects. Long-term effects may, however, occur, since an accumulation of Pb as low as 16 μg.l−1 was recorded in this study.

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