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1 Oceanologia

1 1998

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The influence of marine and lacustrine humic substances on the accumulation of cadmium by the Baltic mussel Mytilus trossulus

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Kożuch J. , Pempkowiak J. , Gjessing E.

Oceanologia

1998

tom No. 40 (1)

39-49

The accumulation of cadmium by the Baltic mussel Mytilus trossulus in the presence of marine and lacustrine humic substances (HS) was investigated under laboratory conditions. The tested organisms were exposed to Baltic Sea water (salinity 7.0 PSU, pH 7.85) spiked with cadmium (50 μg Cd l -1) and humic substances (6.0 mgHS l -1), isolated from either marine (6 sampling sites) or lacustrine (8 sampling sites) environments. Experiments were carried out at a constant seawater temperature of (10±C1oC). The exposure time was 21 days. On average, the humic substances, a fraction of naturally occurring organic matter, were found to stimulate cadmium accumulation in the mussels. Lacustrine humic substances stimulated cadmium uptake to a lesser extent than the marine ones. Cadmium was accumulated preferentially in the hepatopancreas, and to a smaller extent in the gills and muscles, regardless of the presence, properties and origin of the humic substances. However, the effect was modified by the dissimilar physical and chemical properties of the substances, which were related to their place of origin.