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EC number: 293-917-2
CAS number: 91648-55-4
Log Koc = 3.51 - 4.3
Since no reliable adsorption tests are available for C16-20AS Na (CAS
91648-55-4), in accordance to Regulation (EC) No. 1907/2006 Annex XI,
1.5 a read-across to other structurally related substances was
conducted. Read-across data are available for the pure AS homologues:
C8AS Na (CAS 142-31-4), C10AS Na (CAS 142-87-0), C12AS Na (CAS
151-21-3), C14AS Na (CAS 1191-50-0). In the publication by Marchesi et
al. (1991), the experimental sediment sorption data for several alkyl
sulfates with different carbon chain lengths are presented. The Koc
values for the homologues with longer carbon chains: C16AS Na (CAS
1120-01-0) and C18AS Na (CAS 1120-04-3) and C20AS Na were extrapolated
from the available data.
The determined Koc values are:
- for C8AS Na (CAS 142-31-4) between 75 and 100 which corresponds to log
Koc values in the range of 1.88 and 2.0
- for C10AS Na (CAS 142-87-0) between 122 and 178 which corresponds to
log Koc values in the range of 2.09 and 2.25
- for C12AS Na (CAS 151-21-3) between 316 and 446 which corresponds to
log Koc values in the range of 2.5 and 2.65
- for C14AS Na (CAS 1191-50-0) between 1337 and 1567 which corresponds
to log Koc values in the range of 3.13 and 3.19
- for C16AS Na (CAS 1120-01-0) the extrapolated value of Koc equals 3273
which corresponds to log Koc 3.51
- for C18AS Na (CAS 1120-04-3) the extrapolated value of Koc equals 8166
which corresponds to log Koc 3.91
- for C20AS Na the extrapolated value of Koc equals 19953 which
corresponds to log Koc 4.3
Based on the log Koc values determined for pure C16, C18 and C20
homologues, the log Koc range of C16-20AS Na (CAS 91648-55-4) is
between 3.51 and 4.3 (Koc values between 3273 and 19953).
For PNEC sediment and soil derivation according to the equilibrium
partitioning method (EPM), the lower boundary of the range (Koc = 3273)
was taken into account, since this value represents the worst case
scenario for the chemical safety 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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