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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Based on read-across with the chemical closely related substance C.I. Pigment Blue 15 (CAS No 147-14-8; EC No 205-685-1) C.I. Direct Blue 264 is considered as "not readily biodegradable".

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

As there is no data available for C.I. Direct Blue 264 (CAS No 68411-04-1; EC No 270-096-9), read-across with the chemical closely related substance C.I. Pigment Blue 15 (CAS No 147-14-8; EC No 205-685-1) is proposed to cover this endpoint.

Both substances have a very similar chemical structure. C.I. Direct Blue 264 is an UVCB substance consisting of phthalocyanine copper complexes. All constituents have copper phthalocyanine (= C.I. Pigment Blue 15) as basic structure. Compared to C.I. Pigment Blue 15 the C.I. Direct Blue 264 constituents are carrying a varying number of side chains (sulfonic acid and dimethylaminopropyl sulfonamide).

Based on the structural similarity and the fact that the result of the study on biodegradation of C.I. Pigment Blue 15 already displays the worst case (“no biodegradation observed”) the read-across approach is assumed to be justified.