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Environmental fate & pathways

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The test substance is a solid, water soluble, with very low vapour pressure and a negative Kow.

It resulted hydrolytically stable: it is stable at pH 4, 7 and 9 at 50 °C and it has a 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 18/19 minutes taking into account a 12-h day and a mean OH radical concentration of 1.5E06 radicals per cm³. The substance undergoes photodegradation in surface water, with half lives that range from about to 4 to 5 hours, but this process is effective mainly in the photic zone of lakes and rivers and near the surface.

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 has been demonstrated as not bioaccumulative.