Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Hydrolysis:

Corsair Clear #12 was not assessed for hydrolysis as this study was technically not feasible.

According to the guideline, the concentration of test samples should not exceed half the water solubility of the test substance or 0.01 M, whichever is lower. The water solubility of the test substance is < 1 mg/l. An analytical method to support the hydrolysis test at this low concentration level was not available. The test on the hydrolysis of the test substance could therefore not be performed.

Ready biodegradability:

According to the EU criteria and based on the modified Sturm test presently performed, Corsair Clear #12 would be regarded as not readily biodegradable. However, the negative result of the available biodegradation study may be due to the fact that the tested concentration was far above the maximum water solubility. Thus, in view of lack of the optimal contact between the test substance and the medium in the present Modified Sturm test, no definitive conclusions can be drawn with respect of biodegradability of the test substance.

Adsorption/desorption coefficient:

Since it was not possible to determine the Kocand log Koc values of the test substance using the HPLC method, the QSAR calculation method was applied. Based on the water solubility of the test substance ( 2.82 x 10-4 g/l) the compound was classified as “predominantly hydrophobic”. For this chemical class, the log Koc is given as: log Koc = 0.81 log Pow + 0.10.       

Using the HPLC method the partition coefficient, Pow, of Corsair Clear #12 was determined to be > 3.2 x 106 (log Pow > 6.5).

When applying this log Pow value to the above given equation, the log Koc of Corsair Clear #12 was calculated to be > 5.4.