Registration Dossier
Registration Dossier
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Reaction mass of disodium 4-amino-6-[[4-[(2,4-diaminophenyl)diazenyl]phenyl]]-3-((E)-[4-((E)-(2,4-diaminophenyl)diazenyl]phenyl )diazenyl)-5-hydroxynaphthalene-2,7-disulphonate and disodium 4-amino-6-((E)-(4-aminophenyl)diazenyl)-3-((E)-(4-((E)-(2,4-diaminophenyl)diazenyl)phenyl)diazenyl)-5-hydroxynaphthalene-2,7-disulfonate
EC number: 951-695-0 | CAS number: -
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
not inherently biodegradable
Key value for chemical safety assessment
- Biodegradation in water:
- under test conditions no biodegradation observed
Additional information
The biodegradability of Direct Black 19 exposed to activated sludge of a municipal sewage treatment plant was investigated under aerobic static conditions following OECD 302b.
Based on the data of the individual DOC determinations reached a biodegradation of 15 % after 28 days.
No significant elimination of the test substance due to adsorption to the activated sludge, on the glass surface or other physico-chemical processes was found as determined by means of DOC measurements 3 h after the start of the test.
The biodegradation of the tested item reached 13 % after 28 days of incubation, confirming that no significant biodegradation occurred.
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