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Physical & Chemical properties

Water solubility

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Description of key information

water solubility (whole substance): <0.1 mg/l at 20±0.5°C (read-across). 
water solubility (individual constituents): <1E-04 - 1.5E-01 mg/l at 20°C (QSAR)

Key value for chemical safety assessment

Additional information

There are no reliable measured water solubility data for the submission substance. However, reliable data are available for related substances in the relevant carbon number range.

The "whole substance" water solubilities of the related substances, Hydrocarbons, C10-C13, n-alkanes, isoalkanes, <2% aromatics (GS190), Hydrocarbons, C12-C15, n-alkanes, isoalkanes, <2% aromatics (GS215), Hydrocarbons, C14-C16, n-alkanes, isoalkanes, <25 aromatics (GS250) and Hydrocarbons, C15-C19, n-alkanes, isoalkanes, <2% aromatics (GS270) were evaluated using a slow-stir method. The method was designed to be compatible with EU Method A.6 and OECD 105. Since the test substances are a UVCBs, 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 the resulting aqueous concentration or composition of the dissolved fraction were affected. The water solubility of GS190, GS215, GS250 and GS270 was determined to be <0.1 mg/l at 20±0.5°C at both the 100 mg/l and 10 mg/l loading rates. The results are considered to be reliable and are used as weight of evidence.

As supporting information, the water solubility of each constituent has also been predicted using a separately 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 the water solubility of the individual constituents is in the range <1E-04 mg/l - 1.5E-01 mg/l at 20°C.