Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

The substance was considered to be not readily biodegradable.

Additional information

By the nature of their design and use, optical brighteners 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. Nevertheless, BOD5 and COD values have been determined for the substance under invstigation. The Chemical Oxygen Demand of the substance was determined to be 586 mg/g O2, whereas the Biological Oxygen Demand of the substance was determined to be 0 mg/g O2. The resulting quotient BOD5/COD was determined to be 0 mg/g O2 indicating that the test substance is not biodegradeable. In the another set of supporting studies, the Chemical Oxygen Demand of the substance was determined to be 897 mg/g O2, whereas the Biological Oxygen Demand of the substance was determined to be 240 mg/g O2, thereby giving the BOD5/COD ratio of 0.26 (<0.5), indicating the substance to be not degradable.