Registration Dossier
Registration Dossier
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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.
Endpoint summary
Administrative data
Description of key information
Tar acids, Xylenol fraction (CAS 84989-06-0) is considered as inherently biodegradable based on all available information (weight-of-evidence) and following an analogue read-across. Further, the substance has a low potential for accumulation in soil and sediment.
Additional information
Although there is evidence that constituents like cresols, ethylphenols or some xylenols are readily biodegradable Tar acids, Xylenol fraction (CAS 84989-06-0) is considered as inherently biodegradable since rapid degradation cannot be shown for all constituents of the UVCB substance. Results on the biodegradation in sediment provide evidence that these constituents will be ultimately degraded under aerobic conditions with half-lives for p-cresol between 9.4 and 43 h in water and between 5.9 and 11 h in water/sediment systems. In so-called eco-cores, p-cresol degraded with half-lives between 3.0 and 16 h. In simulation studies with soil o-cresol degraded with half-live times of 1.6 d for sandy loam and 5.1 d for sandy silt loam. m-cresol degraded with half-live times of 0.6 d for sandy loam and 11.3 d for sandy silt loam. Therefore, the substance has a low potential for accumulation in soil and sediment.
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