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Description of key information

Testing was not carried out according to Method C7 of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 111 of the OECD Guidelines for Testing of Chemicals, 13 April 2004 for the following reasons:

1. The test material was determined, to have a very low water solubility value of 0.0068 mg/l.            

2. As the hydrolysis guidelines require an initial solution concentration of less than half the water solubility, the test concentration would need to be even lower than this. On top of that, the guidelines also require the test material to be analytically measureable at 10% of the initial test concentration, further increasing the sensitivity that an analytical method would need to have. Test material concentrations, even after being extracted to concentrate the samples, would likely to be less than the limit of quantification.          

3. At the low concentration that would be required for the hydrolysis test, it would possibly be difficult to get near 100% recovery of test material from the aqueous samples, as seen in the recoveries performed for the water solubility. Loss of test material may be due to factors like adsorption to glassware. If sample concentrations got even lower, then recovery may reduce even further. The main functional groups in the test material are imides and an amide. Neither of these functional groups are normally susceptible to rapid hydrolysis under environmentally relevant conditions, but both are known to hydrolyse slowly nevertheless.  

Key value for chemical safety assessment

Additional information