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EC number: 905-562-9
CAS number: -
The 14 day EC50 based on reduced fresh weight of germinated seedlings is >1000 µg/kg soil for o-xylene. Analytical monitoring showed that concentrations of o-xylene had reduced to <10% of nominal by the end of the exposure, so the true effect value is lower than that reported.
A single study to investigate the effects of
o-xylene on terrestrial plants was found. This study reported a 14 day
EC50 of >1 mg/kg nominal, although analytical measurements indicated
that <10% nominal remained at the end of the test. The methods used in
study were equivalent to OECD 208 (1984). The main deviations from this
guideline were a higher clay content than recommended, and the reporting
of results at 14 days post sowing, not 14 days post germination of the
controls. Insufficient details are given in the paper to allow us to
conclude whether the validity criteria of the test were met as results
from the controls are not reported. Despite these restrictions this
study does allow us to conclude that major effects on the growth of
lettuce are not seen at the highest concentration tested although this
is probably due to reduced exposure due to volatilisation or
biodegradation. The results from this study will not be used to
calculate a PNEC in the risk assessment due to these limitations.
The EU RAR (ECB 2007) discusses a single
study on the toxicity of ethylbenzene to terrestrial plants via the
atmosphere (Ivens, 1952). The study exposed the leaves of plants to
concentrations of ethylbenzene as vapour for 1 hour and found that the
NOEC was very close to the concentration which killed leaves completely.
The reported EC50 are 27 g/m3 for runner bean (Phaseolus multiflorus)
and 48 g/m3 for parsnip (Pastinaca sativa).
The Draft Screening Assessment Report
(Environment Canada 2014) presents results from ESG International (2002)
for the toxicity of ethylbenzene to Northern wheatgrass of 14 day LC25
of 3 mg/kg dw (coarse sandy loam). The Northern Wheatgrass value was
taken by Environment Canada as the critical toxicity value for
ethylbenzene toxicity to terrestrial species.
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