Registration Dossier
Registration Dossier
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EC number: 701-299-7 | CAS number: -
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
The adsorption potential is considered to be high, based on log Pow values of relevant constituents in the substance 'Naphtha (petroleum), steam-cracked, C8-10 aromatic hydrocarbon fraction, alkylated and oligomerised' (NAF-AO) [EC no. 710-299-7] (see Chap. 1) ranging from about 6.5 to above 10. A log Koc value of 6.085 (Koc 1,216,000) has been calculated with a log Pow value of 6.5 using the relation of Seth 1999 (see below).
Key value for chemical safety assessment
- Koc at 20 °C:
- 1 216 000
Additional information
Measured values of (log) Koc are not available for NAF-AO. As first approximation, a (log) Koc value will be estimated based on a (Q)SAR between log Pow and log Koc. The correlation derived by Seth et al. (1999, Environ Sci Technol 33: 2390-2394) will be used. The relation is based on a large number (n = 117) of substances representing a wide variety of compounds, and the correlation coefficient r² is high (0.95). The equation for the relationship between log Pow and log Koc is: log Koc = 1.03 log Pow - 0.61.
The log Pow values of NAF-AO constituents extent over large range due to constituents groups with different degrees of oligomerisation. For the chemical safety assessment, the group of constituents with the highest water solubility is selected. A representative log Pow of these NAF-AO constituents is 6.5. The (log) Koc is estimated with the equation of Seth using this log Pow value.
log Koc = 1.03 x 6.5 - 0.61
log Koc = 6.085
Koc = 1,216,186
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