Registration Dossier
Registration Dossier
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EC number: 274-436-7 | CAS number: 70210-39-8
Endpoint summary
Administrative data
Description of key information
The chemical class of reactive dyes is generally not considered to be biodegradable at all. For the present substance Reactive Red 066, only few data are available to cover this endpoint. In the past, BOD5 and COD values have been determined to assess the behaviour of the test substance in industrial sewage treatment plants. The calculated BOD5/COD quotient is used to estimate the rate of biodegradation within the sewage treatment plant. In a key study, the BOD5 of FAT 92354/A was 11 mg O2/g while the COD of FAT 92354/A was 742 mg O2/g. The resulting BOD5/COD ratio of 0.015 indicates that this test substance (FAT 91354/A) is not readily biodegradable. In a second study, the BOD5of FAT 40063/A was 64 mg O2/g while the COD was 696 mg O2/g and the resulting BOD5/COD calculation which comes to 0.1 also indicates that this test substance (FAT 40063/A) is not biodegradable. The bioelimination of the test substance (FAT 92354/A) after 28 days is 0 % in Zahn Wellens study while in a second study the bioelimination of the test substance (FAT 40063/A) after 31 days is 37 %. As a conclusion, the substance is considered to be not readily biodegradable.
Additional information
By the nature of their design and use, reactive dyes are not intended to be readily biodegradable as this would assist in the rapid destruction of the chemical, rendering it unfit for purpose. As such, it is accepted that such substances are not readily biodegradable under relevant environmental conditions. A published study (Pagga & Brown, 1986) describes the results of the testing of 87 dyestuffs in short-term aerobic biodegradation tests. The authors of this publication concluded that dyestuffs are very unlikely to show any significant biodegradation in such tests and that there seems little point in carrying out such test procedures on dyestuffs.
There are ISO, European, American (AATCC) and national standards available for the colour fastness of dyes. Dyes are required to have specific fastness properties. If the dyes were biodegradable, it would not be possible for them to have these fastness properties.
References:
Pagga U, Brown D (1986) The degradation of dyestuffs: Part II. Behaviour of dyestuffs in aerobic biodegradation tests. Chemosphere 15: 479-491.Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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