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Physical & Chemical properties

Water solubility

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Description of key information

The water solubility of the test item at 20°C was 2.60 x 10-7 g/l (i.e. 0.260 µg/l). This value is taking from a structural analogue di-tert-dodecyl polysulfide.

Key value for chemical safety assessment

Water solubility:
0.26 µg/L
at the temperature of:
20 °C

Additional information

The slow-stirring flask method was applied for the determination of the water solubility of polysulfides, di-tert-dodecyl. Analysis of the test item was made according to an UPLC-MS/MS specific method making use of derivatization with AgBF4. The water solubility of the test item at 20°C was found to be 2.60 x 10-7 g/l (i.e. 0.260 µg/l). The pH of the aqueous samples was 7.3.

Both source and target substances are tertiary-alkyl polysulfide UVCBs and contain multiple constituents with different sulfur contents and degrees of branching in the alkyl chain. The main difference between the two substances is the chain length of the alkyl chain; the target substance is C8 – 10 branched, C9 rich, whereas the source substance is C11 – 13 branched, C12 rich. Both substances have branched alkyl chains, therefore there are numerous potential constituents present in each substance. Read across between these substances is considered to be appropriate for environmental endpoints based on structural similarity; although there will be some differences in physico-chemical properties, and therefore fate in the environment due to the different chain lengths, these differences are likely to be predictable. Both substances contain branched alkyl chains, therefore the degree of branching is not considered to have an impact on the read across approach.