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EC number: 202-849-4
CAS number: 100-41-4
The environmental fate of ethylbenzene will be determined by
biotic and abiotic degradation processes.
Hydrolysis: Evaluation of structure of
ethylbenzene shows that it is not expected to hydrolyze appreciably in
the environment on the basis of a lack of hydrolysable functional groups.
Phototransformation in air: half life of 1.8
days is estimated for reaction of ethylbenzene with hydroxyl radicals in
the atmosphere at 25oC [AOPWIN Program, v.1.92]. Overall
QSARs estimated half-life for degradation of ethylbenzene in air based
upon AOPWIN Model is 36.14 hours.
Ethylbenzene is a volatile substance which is difficult to test
for biodegradation in the experimental systems. The QSAR models predict
timeframe within days-weeks for primary biodegradation of ethylbenzene
and weeks for its ultimate degradation.
QSARs estimated half-lives for biodegradation of ethylbenzene in
water and sediment based upon BIOWIN Ultimate Biodegradation are 360
hours (15 days) and 3240 hours (135 days), respectively. Whereas the
half-lives of ethylbenzene for volatilization from water are estimated
as 0.05 days (for a river) to 4.11days (for a lake) using EPI Suite
There are no experimental data on environmental distribution of
ethylbenzene. QSAR modeling predicts that ethylbenzene will volatize
rapidly from surface water with TD50 = 0.05 days (river) and 4.11 days
The low value for soil organic carbon-water partition coefficient
(logKoc <3) suggests that ethylbenzene will not adsorb onto soil and
sediment and, therefore, together with its high volatility, will not
persist in these environmental media.
The data on environmental distribution of ethylbenzene obtained
from the level III fugacity model suggest that ethylbenzene will not
persist in the environment and depending on various emission scenarios,
approx. 70% of ethylbenzene will be degraded by both biotic and abiotic
mechanisms and approx. 30% will be physically removed (advected) from
It is generally assumed that non-ionised organic substances with a
log Kow below 3 are not significantly bioaccumulative (refer Section R7c
of the ECHA Guidance on information requirements). Moreover, in the GHS
classification system the cut-off value of log Kow for bioaccumulation
is 4. The estimated log Kow for ethylbenzene is 3.
Generally, a BCF in fish of ≥ 500 is indicative of the potential
to bioconcentrate for classification purposes in accordance with CLP/GHS
criteria. The estimated BCF/BAF values of ethylbenzene in fish (55 -73
L/ kg wet-wt) are well below the cut-off value of 500 for
bioconcentration/ bioaccumulation potential in aquatic organisms.
Therefore, ethylbenzene is not likely to bioaccumulate in aquatic
By applying the Tier 1 assessment and, in particular, taken into
account the structure of ethylbenzene (i. e. a non-ionised organic
substance), its physico-chemical properties (i. e. log Kow <4) and
environmental fate data suggesting that this chemical will not adsorb to
soil particles (logKoc <3) and will likely to volatize from soil, it is
considered that the substance is unlikely to be significantly
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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