Registration Dossier
Registration Dossier
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EC number: 234-042-8 | CAS number: 10508-09-5
Water solubility
Administrative data
Link to relevant study record(s)
Description of key information
OECD Guidelines 105 and 123, GLP, key study, validity 1:
Water solubility = 13.83 mg/L at c.a. 20°C
Key value for chemical safety assessment
- Water solubility:
- 13.83 mg/L
- at the temperature of:
- 20 °C
Additional information
One key study is available to determine the water solubility of di-tert-amyl peroxyde
according to a method derived from the OECD Guidelines 105 and 123 with GLP statement.This study was successively performed according to 3 experimental patterns. At first, the Flask method was used but as the concentrations measured were lower than expected, it was decided to use the Column Elution method. However, this method did not allow to determine the water solubility as the test item concentration passed very quickly below the detection limit of the analytical method (0.51 mg/L). Finally, it was decided to use a flask protocol derived from the OECD 123 (normally used for the log Kow determination) Slow Stirring method. This method uses special temperature controlled 800 mL glass-jacketed test vessels having a sampling tap at their lower part and a magnetic bar at their bottom. Three flasks were used for the test where a volume of 650 mL of ultrapure water at 20 °C was poured. Then 650 mg (793 µL) of the test substance were added at the suface of water into each flask, and magnetic stirring was started. A speed of approximately 200 rpm was set up in order to create a vortex of around 0.5 cm high. Samples were taken from each flask along 6 days, with elimination of 5 to 10 mL in order to rinse the tap before sampling.
During the analysis, the temperature was 20.43°C and the mean value of pH was 5.95.The equilibrium was reached after approximately 2 days, as concentrations from the 5 following samples did not differ by more than 30 %. The average value of the water solubility was calculated as the mean of the 5 last values obtained during approximately 5 days. Thus, it can be concluded that the water solubility of the test substance is 13.83 mg/L.
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