Registration Dossier
Registration Dossier
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EC number: 287-502-5 | CAS number: 85536-20-5
Toxicity to terrestrial plants
Administrative data
Link to relevant study record(s)
Description of key information
The 14 day EC50 based on reduced fresh weight of germinated seedlings is >1000ug/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.
Key value for chemical safety assessment
Additional information
A single study to investigate the effects of o-xylene on terrestrial plants was found. This study reported a 14 day EC50 of >1mg/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.
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