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Environmental fate & pathways

Hydrolysis

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Description of key information

The UVCB test item is considered to be hydrolytically stable based on data disseminated by ECHA following REACH registration of the environmentally relevant constituent [EC 273-279-1].

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Additional information

Test guidelines for hydrolysis are not, in general, recommended for complex mixtures because components could have different hydrolytic rates that give rise to non-pseudo first order hydrolysis plots. In addition, hydrolysis products can be analytically indistinguishable from the starting components because larger components hydrolyse to hydrolysis products that have the same structure as components already within the test item. Furthermore, the test item is a complex, surface active, UVCB where the components exist as ion pairs and this fact would be expected to add further complexity to any experimental system used as a method of describing hydrolysis. Nevertheless, a conclusion on hydrolysis potential can be drawn from data disseminated by ECHA for the environmentally relevant amine [EC 273-279-1] because hydrolytic stability of the components in that substance were found to be consistent with the absence of hydrolytically susceptible functional groups. It can therefore be predicted that the UVCB described in this dossier is likely to be hydrolytically stable (half-life at 25 °C > 1 year) at pH 4, 7, and 9.

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