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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Log Koc = 2.5 - 3.19 based on experimental data.

Key value for chemical safety assessment

Koc at 20 °C:

Additional information

Since no reliable adsorption tests are available for C12-14AS MIPA (CAS 85681-66-9), in accordance to Regulation (EC) No. 1907/2006 Annex XI, 1.5 a read-across to structurally related category members was conducted. Read-across data from C12AS Na homologue (CAS 151-21-3) and C14AS Na homologue (CAS 1191-50-0) were used in order to determine the Koc value of C12-14AS MIPA (CAS 85681-66-9). 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 C14 homologue (CAS 1191-50-0) between 1337 and 1567 which corresponds to log Koc values in the range of 3.13 and 3.19.

Due to structural and property similarities with the tested category members it can be concluded that the above results apply also to C12-14AS MIPA (CAS 85861-66-9). The Koc range is between 316 and 1567 corresponding to the log Koc range between 2.5 and 3.19. Adsorption of the substance to soil or sediment is therefore low to moderate. 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]