Registration Dossier
Registration Dossier
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EC number: - | CAS number: 42355-78-2
Endpoint summary
Administrative data
Description of key information
Additional information
The test substance is a solid with very low vapour pressure, very high solubility and low Kow. It was estimated as hydrolytically stable at pH 4, 7 and 9 at 50 °C and it has an estimated half-life period longer than one year at 25 °C at pH 4, 7 and 9. The substance has not hydrolysable chemical groups in the chemical structure.
Based on calculations according to AOPWIN v1.92, the substance is indirectly photodegraded by reaction with hydroxyl radicals in the atmosphere with half-lives of about 0.58 h taking into account a 12 -h day.
The substance undergoes photodegradation, with a half-life ranging from about 4 to 5 hours, in the photic zone of lakes and rivers. Other processes like biodegradation and hydrolysis are not able to degrade the substance at good rates. Adsorption will partially bring the substance onto the surface of suspended particles and will also contribute to the adsorption of the substance into sediments. The substance has to be considered as potentially persistent.
The substance is neither readily nor inherently biodegradable in standard tests for biodegradability. However, the substance is subject to direct photolysis.
Adsorption will partially bring the substance onto the surface of suspended particles and will also contribute to the adsorption of the substance into sediments, where an anaerobic degradation process can be effective. Nevertheless this is unlikely to occur in the usual conditions of use, where the substance is adsorbed to the sludge in the STP, therefore significant release into surface waters is not expected and exposure of sediment is thereby unlikely.
The substance is estimated as not bioaccumulative based on the log Kow and the testing results on similar substances in the category.
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