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Accumulation of polonium by mytilus trossulus under experimental conditions

100%

Stepnowski P. , Kozuch J.

tom 28

nr 1-2

73-82

The bioaccumulation of polonium in the Baltic mussel Mytilus trossulus was studied experi-mentally in an attempt to discover the differences between food and water as sources of polonium. The 209Po isotope was used as tracer for accumulation and excretion. The highest 209Po con-centration was found in the hepatopancreas of mussels exposed to spiked water for 24 days. Both parts of the experiment (exposure to food and water) showed that while the rate of bioaccumula-tion of polonium by Mytilus trossulus was very high, the excretion rate was also relatively high. Furthermore, in both cases the duration of the accumulation-excretion (a-e) cycle of polonium in Mytilus trossulus was 10 days. Finally, a simple mathematical model approximating the experimental data was developed.

Polonium, uranium and plutonium in the Southern Baltic Sea

88%

Skwarzec B.

nr 1

195-204

This paper presents the results of measurements of polonium, uranium and plutonium radionu-clides in selected components of the southern Baltic ecosystem, as well as the recognition of their accumulation processes in the trophic chain. Investigation on the 210Po, 239+240Pu concentrations in the Baltic biota revealed that these radionuclides are strongly accumulated by some species. Their mean values of the bioaccumulation factor (BCF)* fell within the range from 9?102 to 2.5?104. The Baltic Sea algae, benthic animals and fish concentrated uranium isotopes only to a small degree, and mean BCF values for this element range from 1 to 55, what is several orders of magnitude lower than for polonium and plutonium. Moreover, it was found that fish constitute an important source of 210Po for human.