Amines, rosin, compds. with 9-(2-carboxyphenyl)-3,6-bis(diethylamino)xanthylium chloride and disodium hydrogen bis[4-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-3-hydroxy-1-naphthalenesulfonato(3-)]chromate(3-)

Biodegradation in water: screening tests

Description of key information

Not readily biodegradable (according to OECD criteria).

Key value for chemical safety assessment

Biodegradation in water:

under test conditions no biodegradation observed

Additional information

The ready biodegradability of the test substance was tested according to the OECD guideline 301B: CO2 evolution (modified Sturm) test (1992). The biodegradation of the test substance was determined by exposing it to microorganisms from the secondary effluent of a domestic waste water treatment plant. As a reference compound (procedure control), Aniline was tested simultaneously under the same conditions. In the toxicity control, containing both test substance and the reference compound Aniline, no inhibitory effect on the microorganisms was observed. In the procedure controls, the reference compound Aniline was readily biodegraded by an average of 66.0 and 77.2 % after 14 and 13 days of exposure, respectively. At the end of the test. Aniline was biodegraded by an average of 65.6 and 78.3 %. All validity criteria were fulfilled. At the end of the test, the test substance was biodegraded by an average of 0.8%.

In conclusion, the Orasol Pink 478 (CAS 97862-65-2) is assessed to be not readily biodegradable (according to OECD criteria).