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Environmental fate & pathways

Adsorption / desorption

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Description of key information

log Koc = 2.5 - 2.8 (experimental data)

Key value for chemical safety assessment

Koc at 20 °C:
316

Additional information

Since no reliable adsorption tests are available for C12-13AS Na (CAS 1231880-35-5), in accordance to Regulation (EC) No. 1907/2006 Annex XI, 1.5 a read-across to another structurally related category members was conducted. Read-across data from C12AS Na homologue (CAS 151-21-3) and C13AS Na homologue (CAS 3026-63-9) were used in order to determine the Koc value of C12-14AS TEA (CAS 90583-18-9). In the publication of Marchesi et al. (1991), sediment sorption data for several alkyl sulfates with different carbon chain lengths are presented. The determined Koc values are:

- for C12 homologue (CAS 151-21-3) between 316 and 446 which corresponds to log Koc values in the range of 2.5 and 2.65.

- for C13 homologue (CAS 3026-63-9) between 608 and 642 which corresponds to log Koc values in the range of 2.78 and 2.8.

Due to structural and property similarities with the tested category member it can be concluded that the above results apply also to C12-143AS Na (CAS 1231880-35-5). The Koc range is between 316 and 642 corresponding to the log Koc range between 2.5 and 2.8. Adsorption of the substance to soil or sediment is therefore low. For the PNEC sediment and soil derivation according to the equilibrium partitioning method (EPM), the lower boundary of the range (Koc = 316) was taken into account, since this value represents the worst case scenario for the chemical safety assessment.

[LogKoc: 2.5]