A mechanistic and predictive model of metal accumulation by the tissue of the Australian freshwater mussel Felesunio angasi

Elsevier Inc
Publication Type:
Journal Article
The Science of the Total Environment, 1992, 125 pp. 85 - 95
Issue Date:
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A mechanistic model explains the differential rates of accumulation of alkaline-earths in the tissue of the freshwater mussel Velesunio angasi as being determined by their different loss rates. These rates of loss are hypothesised to be directly related to the solubility of the alkaline-earth metal when deposited in phosphate-bearing, extracellular granular deposits that are dispersed throughout the tissue. This model is further tested by an experimental determination and comparison of the biological half-lives of the non-alkaline earths 2t°pb, 6°Co with that of 45Ca in the mussel's tissue, that are predicted to vary in their solubilities as phosphates. The experimental results indicated that the ranking of biological half-lives of these elements is 21°pb > 6°C0 ~ 45Ca. These results are in accord with their predicted solubility constants and previous experimental studies, and hence are consistent with the model. Several assumptions that are implicit in this model are presented and compared for consistency with findings from other studies on V. angasi and other species of freshwater mussels.
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