Registration Dossier
Registration Dossier
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EC number: 270-109-8 | CAS number: 68411-20-1
PBT assessment
Administrative data
PBT assessment: overall result
- PBT status:
- the substance is not PBT / vPvB
- Justification:
P-criterion: The substance is not readily biodegadable. In several tests including closed bottle tests with reduced substance concentrations and in an inherent test the degradation rates were in the range of 24 to 39%.
Abiotic degradation occurs by hydrolysis in a complex reaction: The first step is the rapid formation of aniline, the second step the slow formation of 3 -ethyl-4 -propyl- quinoline (or isomer).A portion of the substance of about 30% was found to be degradable by hydrolysis. It is therefore concluded that the hydrolysable constituents are the same which are biodegradable. Especially aniline is formed hydrolytically which can subsequently be biodegraded.
B-criterion: The log Pow of the substance is >4.5. Therefore the screening criterion is fulfilled. However, parts of the complex substance hydrolyse quickly, and the final hydrolysis product 3 -ethyl-4 -propyl-quinoline is not B according to a QSAR (see below).
Further information is necessary in order to quantifiy the bioaccumulation behaviour. This will be done by an in-depth evaluation of the currently unknown hydrolysis products.T-criterion: The substance is T as it is classified as STOT Rep. Exp. 2 (H373).
Hydrolysis product aniline is not PBT/vPvB as it is readily biodegradable and not bioaccumulative.
Hydrolysis product 3 -ethyl-4 -propyl- quinoline: There is not enough information available for finally assessing the P-criterion. It is probably not readily and inherently biodegradable and not degradable by hydrolysis. However this substance is degraded by photolysis with a half-life of 15 days at 21°C. Photolysis in water occurs mainly in the upper water layer and therefore the substance in lower water layers is not affected by sunlight. With a (calculated) logPow of 4.7 the screening B criterion is fulfilled but a QSAR on BCF yields a BCF of 596 indicating that this product is not B.
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