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Environmental fate & pathways

Hydrolysis

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Description of key information

Negligible

Key value for chemical safety assessment

Additional information

Hydrolysis is a common degradation route in the environment, namely the reaction of a substance with water with a net exchange of the X group with an OH at the reaction centre such that RX + H2OROH + HX. Hydrolysis is often dependent upon pH as the reaction is commonly driven by hydrogen or hydroxide ions. Hydrolysis kinetics are usually determined experimentally and should be used to consider the test type and whether parent or degradation product should be tested.

In the case of the Direct Blue 199, it can be estimated that hydrolysis can be considered as negligible degradation pathway due to the chemical structure and functional groups presents.

Hydrolysable organic groups are in fact those groups that can react with water like Esters, Anhydrides, Amides, Carbammates, Nitriles, Cyanates, Epoxides, Halomethanes, Alkylhalides, Urea and none of these groups are present within the commonly market substance formula.

Additionally, by the nature of their design and use, phthalocyanine derivatives dyes are not intended to be readily degradable in water as this would assist in the rapid destruction of the dyestuff, rendering it unfit for purpose. As such, it is accepted that such substances are not readily hydrolyzed.