Diisopropylbenzene hydroperoxide

Water solubility

Description of key information

One key study is available to determine the water solubility of the test item applying the procedure described in the OECD Guideline 105 with GLP statement. As the water solubility was expected to be higher than 10 mg/L for the test item, it appeared that the flask method was best suited. The test is preferably run at 20 +/- 0.5°C. The chosen temperature should be kept constant in all relevant parts of the equipment. The pH of each sample should be measured. Six 250 mL Schott flasks were used to mix 0.5 g of the test item with 100 mL of ultrapure water. Flasks were placed in a temperature controlled oven at 30°C under magnetic stirring. After 24 hours, two flasks were removed and placed in another temperature controlled oven at 20 +/- 0.5°C during 24 hours. After separation of the insoluble upper part by decantation, the concentration of the test item in the clear aqueous phase was then determined following the analytical method (HPLC/UV, detection limit of the method is 5.5 mg/L and quantification limit is 18 mg/L). The other flasks were treated similarly after initial equilibration at 30°C for 2 and 3 days respectively. The pH of samples were checked before analysis. The test is considered as satisfactory if the concentrations measured in the 2 last vessels don't differ by more than 15%.
    
    
    

The test item is at 52.5% in diisopropylbenzene. The analysis was performed using this 52.5% solution as standard. In order to have the water solubility results expressed in 100% test item, a correction was performed.








  
  
  

Water solubility results of each replicate are presented below:











- T.24h: test item concentration 604 - 588 mg/L (pH: 7.37 - 7.43);











- T.48h: test item concentration 635 - 601 mg/L (pH: 7.00 - 6.94);











- T.72h: test item concentration 709 -604 mg/L (pH: 6.92 - 6.00).











As required by the guideline, the concentrations measured in the 2 last vessels don't differ by more than 15%. Thus, as shown by these results, the water solubility of the test item is 624 mg/L.











Two peaks are present on the UV chromatogram for the test item. It may correspond to two isomers of the test item.

Key value for chemical safety assessment

Water solubility:

624 mg/L

at the temperature of:

20 °C

Additional information

One key study is available to determine the water solubility of the test item applying the procedure described in the OECD Guideline 105 with GLP statement (Gancet, 2012). As the water solubility was expected to be higher than 10 mg/L for the test item, it appeared that the flask method was best suited. The test is preferably run at 20 +/- 0.5°C. The chosen temperature should be kept constant in all relevant parts of the equipment. The pH of each sample should be measured. Six 250 mL Schott flasks were used to mix 0.5 g of the test item with 100 mL of ultrapure water. Flasks were placed in a temperature controlled oven at 30°C under magnetic stirring. After 24 hours, two flasks were removed and placed in another temperature controlled oven at 20 +/- 0.5°C during 24 hours. After separation of the insoluble upper part by decantation, the concentration of the test item in the clear aqueous phase was then determined following the analytical method (HPLC/UV, detection limit of the method is 5.5 mg/L and quantification limit is 18 mg/L). The other flasks were treated similarly after initial equilibration at 30°C for 2 and 3 days respectively. The pH of samples were checked before analysis. The test is considered as satisfactory if the concentrations measured in the 2 last vessels don't differ by more than 15%.

The test item is at 52.5% in diisopropylbenzene. The analysis was performed using this 52.5% solution as standard. In order to have the water solubility results expressed in 100% test item, a correction was performed.

Water solubility results of each replicate are presented below:

- T.24h: test item concentration 604 - 588 mg/L (pH: 7.37 - 7.43);

- T.48h: test item concentration 635 - 601 mg/L (pH: 7.00 - 6.94);

- T.72h: test item concentration 709 -604 mg/L (pH: 6.92 - 6.00).

As required by the guideline, the concentrations measured in the 2 last vessels don't differ by more than 15%. Thus, as shown by these results, the water solubility of the test item is 624 mg/L.

Two peaks are present on the UV chromatogram for the test item. It may correspond to two isomers of the test item.