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EC number: 905-588-0
CAS number: -
studies are not available for any of the streams in this category.
However, it is difficult to assess the persistence of streams using
standard test methods as the tests measure the properties of the whole
substance but do not provide information on the individual constituents.
Instead, it is more appropriate to consider whether the representative
components of these streams are persistent. Therefore, data has been
read across from the xylene isomers and ethylbenzene as these are the
major components of the streams in this category.
available for all three xylene isomers from GLP-compliant guideline
studies (Dr Noack 2015). The studies followed OECD guideline 301F (ready
biodegradability: manometric respirometry test) using a mixture of
sewage and soil micro-organisms. m-xylene reached 60% biodegradation
after 5 days and 98% biodegradation after 28 days. o-xylene reached 60%
biodegradation after 8 days and 94% biodegradation after 28 days.
p-xylene reached 60% biodegradation after 7 days and 90% biodegradation
after 28 days. The studies show that the xylene isomers are readily
biodegradable, meeting the 10 day window criterion.
The EU RAR
(2007) concludes that ethylbenzene is readily biodegradable. The Risk
Assessment Report is peer-reviewed by the Scientific Committee on
Toxicity, Ecotoxicity and the Environment (CSTEE), now renamed
Scientific Committee on Health and Environmental Risks (SCHER) which
gives its opinion to the European Commission on the quality of the risk
assessment. This Draft Risk Assessment Report has undergone a discussion
in the Competent Group of Member State experts with the aim of reaching
consensus by interpreting the underlying scientific information.
addition to the key studies, additional supporting data on the
biodegradability of the xylene isomers and ethylbenzene are available
from a number of sources. Overall, the available data have been used to
conclude that ethylbenzene and the xylene isomers, and therefore the
streams in this category, are readily biodegradable and thus not
Persistent (P) or very Persistent (vP) based on the screening criteria
for persistence stipulated in ECHA's Guidance on information
requirements and chemical safety assessment - Part C: PBT Assessment
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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