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Environmental fate & pathways

Bioaccumulation: aquatic / sediment

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Description of key information

The highest BCF for edible portions of Salmo gairdneri was 25.9.

Key value for chemical safety assessment

BCF (aquatic species):
25.9 dimensionless

Additional information

Walsh et al (1977) conducted a 56 day flow through test, with analytical confirmation of exposure concentrations, to determine the bioaccumulation of mixed xylene isomers by Salmo gairdneri. After 56 days the concentration of xylene in the edible portions of the fish was measured. By comparing the concentrations measured in the edible portions with the exposure concentrations we have calculated BCF from the data reported by the authors. The highest BCF was 25.9. There was no significant difference in the concentrations measured in the edible portions of the fish after 1 or 56 days exposure, nor at the different exposure concentrations. We can therefore conclude that the bioaccumulation is initially rapid but that after this time the amounts bioaccumulated do not increase with exposure duration.