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Environmental fate & pathways

Adsorption / desorption

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Description of key information

adsorption coefficient (Koc) of the test material: >4.27 x 10E5, log10 Koc >5.63

Key value for chemical safety assessment

Koc at 20 °C:

Additional information

EUSES 2.1.2 includes TGD equations for the prediction of the adsorption coefficient Koc from Kow. The appropriate equation is for the ‘hydrophobics’ group, which is:

log Koc= 0.10 + 0.81log Kow

Kocfor each constituent is calculated from the log Kow . The calculated values are presented in Table 4.2.1 of the CSR.

A study was performed according to EU test method C19 (HPLC method) in which the adsorption coefficient for Distillates (Fischer-Tropsch), C8-26, branched and linear was reported to be greater than 4.27E+05 (log Koc>5.6) (O’Connor and Mullee, 2006). This result is also relevant to Hydrocarbons, C16-C22, n-alkanes, isoalkanes, <2% aromatics.

Adsorption coefficients for individual constituents is described in Section 4.2.1 of the Chemical Safety Report attached in Section 13.