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Water solubility

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Description of key information

Water solubility:

Constituent 1 Vi5-D5: 9.1E-06 mg/L at 20°C (QSAR)

Constituent 2 Vi4-D4: 0.0073 - 0.0088 mg/l at 23°C (measured)

Key value for chemical safety assessment

Water solubility:
0.007 mg/L
at the temperature of:
23 °C

Additional information

2,4,6,8,10-Pentamethyl-2,4,6,8,10-pentavinylcyclopentasiloxane Vi5-D5 (CAS No: 17704-22-2; Constituent 1) has a predicted water solubility of 9.1E-06 mg/L at 20°C, determined using a validated QSAR estimation method.

The solubility of Vi4-D4, Constituent 2 of the registration substance, was determined in various matrices (distilled water, well-water, algal assay medium and seawater) using GC-MS. The solubility was determined by gently placing an excess amount of the substance on the surface of each matrix and a slow-stirring was applied until saturation was attained. The resulting dissolved concentration was measured using GC-MS. In distilled water, a solubility value of 7.3-8.8 ppb (0.0073-0.0088 mg/l) at 23°C was obtained for the submission substance. In well-water and seawater, solubility values of 7.6 -7.9 ppb at 23°C and 9.2 -12.6 ppb at 23°C respectively were obtained. The result is considered to be reliable.