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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.
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
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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