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EC number: 203-396-5
CAS number: 106-42-3
the basis of the similarity of the structure and environmental fate and
behaviour of the xylene isomers, data from all the xylene isomers have
been read across and used to determine their likely environmental fate.
guideline studies are available for xylene isomers showing that they are
ready biodegradable and these are supported by QSAR estimates and
additional studies showing high levels of biodegradation. Tsao
et al. (1998) showed that 50% o- and p-xylene applied to soil were
mineralised in 23 and 13 days, respectively, in a study following a
method similar to OECD 304A. Atkinson (1985) indicates that the xylene
isomers would degrade by indirect photolysis in air, with a half-life of
approximately 1 day. The xylene isomers are not expected to undergo
hydrolysis due to the lack of hydrolysable functional groups.
are expected to have low potential for bioaccumulation based on a
measured BCF of 29 in fish for mixed xylene isomers. The measured log
Koc value of 2.73 for o-xylene indicates that xylene isomers are
expected to have moderate adsorption to suspended solids and sediment in
available data indicate that xylene isomers are readily biodegradable.
Therefore, based on the screening criteria for persistence in the PBT
assessment, the individual xylene isomers are not considered to be
persistent (P) or very persistent (vP). The xylene isomers have a log
Kow in the range of 3.12 to 3.2 and the measured BCF for mixed xylenes
is 25.9 L/kg. Therefore, on the basis of the screening and definitive
criteria, the xylene isomers are not considered bioaccumulative (B) or
very bioaccumulative (vB).
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