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EC number: 905-588-0
CAS number: -
A bioaccumulation in fish study is available for one of the streams in
this category, with the highest BCF for edible portions of Salmo
gairdneri being 25.9. Walsh et al (1977) conducted a 56 day flow
through test, with analytical confirmation of exposure concentrations,
to determine the bioaccumulation of xylene. As 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 conclude that the bioaccumulation is initially rapid
but the subsequent amounts bioaccumulated do not increase with exposure
The screening criterion for bioaccumulation in the PBT assessment is
that a substance with a log Kow of ≤4.5 is not B or vB. Experimental
data for the xylene isomers and ethylbenzene (log Kow of 3.12-3.2)
indicate that this criterion is met. In addition, a measured BCF is
available for mixed xylenes, with the highest reported value for fish
being 25.9 L/kg. Therefore, based on the definitive criteria for
bioaccumulation, the streams are not considered bioaccumulative (B) or
very bioaccumulative (vB).
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