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Physical & Chemical properties

Water solubility

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Description of key information

water solubility (whole substance): <0.1 m/l at 20±0.5°C (measured). 
water solubility (individual constituents): <1E-04 mg/l at 20°C (QSAR)

Key value for chemical safety assessment

Additional information

The water solubility of the submission was evaluated using a slow-stir method. The method was designed to be compatible with EU Method A.6 and OECD 105. Since the submission substance is a UVCB, the effect of initial loading rate was also evaluated during the definitive study using initial nominal loading rates of 100 mg/l and 10 mg/l to assess if resulting aqueous concentration or composition of the dissolved fraction were affected. The water solubility of Hydrocarbons, C18 -C24, isoalkanes, <2% aromatics was determined to be <0.1 m/l at 20±0.5°C in both the 100 mg/l and 10 mg/l loading rates.

Since the submission substance is a UVCB substance, the water solubility of the individual constituents is also important for environmental risk assessment. The water solubility of each constituent has been predicted using a validated QSAR estimation method. The prediction method uses a fragment method and water solubility decreases with increasing carbon number. The prediction domain covers carbon chain length in the range C2-C15 carbon atoms, it is therefore expected that water solubility for longer chain length (i.e. greater than C15) compounds will be lower than the predicted value for C15 atom. Thus a limit water solubility value of <1E-04 mg/l was reported for the individual constituents of the submission substance.