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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

The substance is 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 Pigment Orasol Black X51 (EC no. 939-191-9) is a multipartite chromium complex composed of single complex fractions of azo compounds and amine compounds of the mixtureTridecylamine (TDA), branched and linear (CAS 86089-17-0).

There are experimental data on the readily biodegradability of the complete complex Orasol Black X51 (EC no. 939-191-9) available:

In a study performed according to OECD guideline 301B (CO2 Evolution Test, BASF SE, 2017, Rep. no. 22G0074/16G139), the mean degradation of Orasol Black X51, tested in two concentrations was 3% after 28 days; domestic activated sludge was used as inoculum.

The available data for the complete complex Orasol Black X51 (EC no. 939-191-9) are supported by data on the biodegradation potential of Tridecylamine (TDA), branched and linear (CAS 86089-17-0):

TDA, branched and linear (CAS 86089-17-0) is not readily biodegradable (according to OECD criteria). In a CO2 Evolution Test according to OECD TG 301B, the mean degradation of TDA, tested in two concentrations, was < 10 % after 56 days, indicating poor biodegradability (BASF AG, 2003; rep. no.: 03/0391/36/1); domestic activated sludge was used as inoculum.

Based on the available experimental information Orasol Black X51 (EC no. 939-191-9) is considered to be not readily biodegradable (according to OECD criteria).