Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Disperse Red 086 is not readily biodegradable.

Additional information

By the nature of their design and use, disperse dyes are not intended to be readily biodegradable 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 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 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.


Nevertheless few studies conducted to assess biodegradation of FAT 36034 are available. A study was conducted to evaluate the biodegradation potential of the test substance (of ca. 40% purity) via BOD5 and COD determination. The BOD5 and COD for FAT 36034/A were determined to be 54 mg O2/g and 1317 mg O2/g, respectively. The ratio of these values was equivalent to 0.04, indicating that the substance showed low biodegradation potential under the test conditions.


The COD of FAT 36034/E was determined to 1685 mg O2/g when assessed according to EU Method C.6.