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EC number: 203-396-5
CAS number: 106-42-3
The lowest results are a 72 hour EC50 of 2.2 mg/L and a 72 hour NOEC of 0.44 mg/L, both for p-xylene.
Data are available on the ecotoxicity of
each of the xylene isomers to algae. The studies by Galassi et al (1988)
and TNO (2004) followed OECD 201, whilst Herman et al (1990) used a
non-standard method. All studies included analytical confirmation of the
The EC50 results reported from these studies
for the different isomers are very similar, with a range of 2.2 -4.9
mg/L. The most conservative result from the individual isomers was
reported by TNO (2004) for p-xylene. This was the only study that also
reported NOEC values. These values will be used in the risk assessment.
A TLM-EqP modeling framework was used to
support values derived experimentally and are presented as supporting
The estimated EL50 values from TLM QSAR were
4.831 - 6.129 mg/L, and the estimated NOELR values from TLM QSAR were
0.925 - 1.174 mg/L.
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