Registration Dossier
Registration Dossier
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EC number: - | CAS number: -
Endpoint summary
Administrative data
Description of key information
Additional information
Reactive Brown DYHY 0331/0334 is degraded by hydrolysis at environmentally relevant pH as can be derived from the results of a hydrolysis study which led to a half-life time of less than 20 days at pH 7 and 20°C indicating the potential for significant removal by hydrolysis. Based on results of this hydrolysis study, the half-life at 20°C is > 1 year and < 1 day at pH 4 and 9, respectively. Studies on direct phototransformation in water are not available but it is assumed on the basis of chemical structure and nature of use that the substance is not degraded by direct photolysis.
It was found that the sulfonated azo dyes can be destroyed by UV photooxidation process (Saliha 2004). The kinetics of the degradation depends on the azo, benzene and naphthalene groups of the dyes. The first step of the degradation is related to cleavage of azo bond of the molecule and naphthalene ring, which leads to further degradation until complete mineralization.
It is concluded, therefore, that abiotic processes would contribute significantly to the depletion of the substance within the environment.
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