Registration Dossier
Registration Dossier
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EC number: 464-700-1 | CAS number: 607724-42-5
Endpoint summary
Administrative data
Description of key information
Additional information
Abiotic degradation
Reactive Red F01-0481 is degraded by hydrolysis at environmentally relevant pH as can be derived from the results of a hydrolysis study which led a half-life time of < 1 day at pH 7 and pH 9 at 25°C indicating the potential for significant removal by hydrolysis. Based on results of this hydrolysis study, the half-life at 25°C is > 1 year at pH 4 and < 1 day at pH 7 and pH 9. 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 2005). 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.
Biotic degradation
Reactive Red F01-0481 displaysa low ready biodegradability in that it achieved 0% biodegradation in a ‘Manometric Respirometry Test’. Microbial decolourization of azo dyes in an anaerobic environment occurs as a result of reduction of azo bonds, leading to decolourized metabolites. No ready biodegradation of these metabolites is expected in the anaerobic system (Brown and Laboureur 1983; Alabdraba and Ali 2014). However, these metabolites could be further diminished by means of either biodegradation or autoxidation under subsequent aerobic treatment. The mixed bacterial cultures decolorized three structurally dissimilar azo dyes, suggesting that anaerobic decolourization was not a specific process (Supaka 2003). It was clear that the majority of the colour removal occurred in the anaerobic stage.
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