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Environmental fate & pathways

Adsorption / desorption

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Description of key information

log Koc = 2.07 (experimental data)

Key value for chemical safety assessment

Koc at 20 °C:

Additional information

Since no reliable adsorption tests are available for C9-11AS Na (CAS 84501-49-5), in accordance to Regulation (EC) No. 1907/2006 Annex XI, 1.5 a read-across to other structurally related category members was conducted. Read-across data from C9AS Na (CAS 1072-15-7), C10AS Na (CAS 142-87-0) and C11AS Na (CAS n.a.) were used.

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 C9AS Na (CAS 1072-15-7) between 118 and 147 which corresponds to log Koc values in the range of 2.07 and 2.17

- 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 C11AS Na (CAS n.a.) between 346 and 368, which corresponds to log Koc values in the range of 2.54 and 2.57

Due to structural and property similarities with the tested category members these results apply also to C9-11AS Na (CAS 84501-49-5). The Koc range is between 118 and 368 corresponding to the log Koc range between 2.07 and 2.57. 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 = 118) was taken into account, since this value represents the worst case scenario for the chemical safety assessment.

[LogKoc: 2.07]