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Physical & Chemical properties

Water solubility

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Description of key information

The water solubility was found to be 3 mg/l at 25°C for a test solution of 100 mg/l, and 345 mg/l at 25°C for a test solution of 300 mg/l.

Key value for chemical safety assessment

Water solubility:
3 mg/L
at the temperature of:
25 °C

Additional information

The water solubility of the test substance was determined in accordance with the EU Method A.6 using a stirring test, which is comparable to the shake flask method and was found to be 3 mg/l at 25°C for a test solution of 100 mg/l, and 345 mg/l at 25°C for a test solution of 300 mg/l. The test substance is regarded as being relatively hydrophobic in nature and therefore may exhibit low solubility in water. However, reflecting the range of structures, constituents will exhibit a wide range of water solubility. When adding incremental amounts of a complex of this nature to water, a point will be reached where the solubility limit of the least soluble component is exceeded and the remaining components will partition between the water and the undissolved phases. Consequently, the composition of the total dissolved components can be different from the composition of the parent substance. Water solubility measurements of these substances can be loading rate dependent due to their complex composition.

In addition, the water solubility of Gas oil (polymer-derived), thermal cracked, full range was determined in accordance with the EU Method A.6 using a stirring test, which is comparable to the shake flask method and was found to be 3 mg/l at 25°C for a test solution of 100 mg/l, and 22 mg/l at 25°C for a test solution of 300 mg/l. The test substance is regarded as being relatively hydrophobic in nature and therefore may exhibit low solubility in water. However, reflecting the range of structures, constituents will exhibit a wide range of water solubility. When adding incremental amounts of a complex of this nature to water, a point will be reached where the solubility limit of the least soluble component is exceeded and the remaining components will partition between the water and the undissolved phases. Consequently, the composition of the total dissolved components can be different from the composition of the parent substance. Water solubility measurements of these substances can be loading rate dependent due to their complex composition.

The study was conducted on Gas oil (polymer-derived), thermal cracked, full range, from which the registered substance is derived via steam stripping, and which is compositionally similar to the registered substance. Gas oil (polymer-derived), thermal-cracked, full-range and Thermal cracking oil from blends of rubber, fuel oils and paraffin waxes, steam-stripped are two very closely related substances. They consist of hydrocarbons having carbon numbers predominantly in the same range (C7 to C32) and boil over a very similar temperature range. The oils contain a relatively large proportion of substituted aromatic hydrocarbons (between 62 and 70%), particularly 1-ring aromatic hydrocarbons. Detailed analytical characterisation shows that the oils have a significant number of individual components in common. Both oils are produced by thermal cracking of the same range of hydrocarbon feedstocks at a temperature of 450-500°C. Thermal cracking oil from blends of rubber, fuel oils and paraffin waxes, steam-stripped differs from Gas oil (polymer-derived), thermal-cracked, full-range in that it has been through a steam-stripping process that removes a proportion of the lower boiling components. In addition to their composition and similar manufacturing process, testing has revealed that the two oils have very similar physico-chemical parameters, especially their solubility in water which is in the region of 3 mg/l suggesting that the two substances might be expected to behave similarly in biological and environmental aqueous environments.