Registration Dossier
Registration Dossier
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EC number: 695-988-9 | CAS number: 100556-82-9
Endpoint summary
Administrative data
Description of key information
Additional information
Abiotic degradation
The test substance is found to be not hydrolytically stable at pH 7 and 9 but hydrotically stable at pH 4. This rapid degradation was observed in screening tests in water and in a water/sediments system. Decolourization of 60 and 81 % of the test item was observed in two studies. Such observations are also supported by a publication of Esteves F and Sousa E demonstrating an “Advanced Electrochemical Oxidation Process” (AEOP) concerning the electrochemical degradation of the vinyl sulphone form of Reactive Black 5, in the presence of hydrogen peroxide and copper ions. The reaction between H2O2and electrochemically generated Cu+ions leads to the production of hydroxyl radicals, causing dye oxidation and degradation.
Biotic degradation
The results from the screening tests in water showed the test substance as not readily biodegradable but inherently biodegradable. 60 to 81 % colour elimination was noted in OECD 302B tests.
The test substance rapidly degraded within 2 days in sediment. After 3 to 6 days, only 10 % of the applied Reactive Black 5 could be found and after about 1 month, mineralization of the metabolites started.
The results indicate the test substance to be biodegradable.
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