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EC number: 284-895-5
CAS number: 84989-06-0
The fraction of tar acids, rich in 2,4- and 2,5-dimethylphenol, recovered by distillation of low-temperature coal tar crude tar acids.
Waiving according to the Integrated Testing Strategy for toxicity to
sediment (ECHA, 2017; Endpoint specific guidance, Chapter R.7b, Section
According to “Guidance on information requirements
and chemical safety assessment Chapter R.7b: Endpoint specific
guidance”, Section 7.8.14 Integrated Testing Strategy for toxicity to
sediment (ECHA, 2017), the main property of a substance that triggers
the assessment for the sediment compartment is the potential to adsorb
or bind onto sediment. A log Kow of 3 should be used as trigger value
for a sediment assessment. Available data for all main components of Tar
acids, xylenol fraction (CAS 84989-06-0) demonstrate the log Kow to be
below 3, i.e. xylenol-isomers: 2.09 to 2.42 (DEZA, 2010; EPA, 2010;
Sangster, 1989); cresol-isomers: 1.94 to 1.98 (OECD SIDS, 2003;
Sangster, 1989); ethyl-phenols: 2.09 to 2.58 (DEZA, 2010; Umeyama et
al., 1971; Sangster, 1989), or trimethyl-phenols: 2.67 to 2.73
(Sangster, 1989). Thus, Tar acids, xylenol fraction (CAS 84989-06-0)
exhibits low potential for adsorption to sediment (log Kow < 3).
Furthermore, in accordance with Regulation (EC) No 1907/2006, Column 2
of Annex X, section 9, toxicity tests on sediment organisms do not need
to be investigated if the outcome of the chemical safety assessment
shows no indication of risk on sediment organisms from exposure to the
substance in question. The PNEC sediment has been derived using the
equilibrium partitioning method on the basis of available data for
xylenol-isomers. Xylenol-isomers are the main constituents of Tar acids,
Xylenol fraction (CAS 84989-06-0). Besides the PNEC freshwater, the Koc
is the main input parameter for EPM calculation. As the log Kow values
are very similar among all constituents of Tar acids, Xylenol fraction
(CAS 84989-06-0) and consequently also Koc values the calculated PNECs
for xylenol-isomers are considered representative. The risk
characterization ratio (RCR) has demonstrated that there is no
indication of risk i.e. PEC/PNEC sediment < 1 from current exposure
conditions to the test substance. Furthermore, the substance is unlikely
to pose a hazard to sediment organisms due to the absence of
bioaccumulation potential (considering the low log Kow). Taking all the
available information mentioned above into account long-term sediment
tests with benthic species are not required.
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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