Registration Dossier
Registration Dossier
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A mixture of: tert-alkyl(C12-C14)ammonium bis[1-[(2-hydroxy-5-nitrophenyl)azo]-2-naphthalenolato(2-)]-chromate(1-); tert-alkyl(C12-C14)ammonium bis[1-[(2-hydroxy-4-nitrophenyl)azo]-2-naphthalenolato(2-)]-chromate(1-); tert-alkyl(C12-C14)ammonium bis[1-[[5-(1,1-dimethylpropyl)-2-hydroxy-3-nitrophenyl]azo]-2-naphthalenolato(2-)]-chromate(1-); tert-alkyl(C12-C14)ammonium [[1-[(2-hydroxy-5-nitrophenyl)azo]-2-naphthalenolato(2-)]-[1-[(2-hydroxy-5-nitrophenyl)azo]-2-naphthalenolato(2-)]]-chromate(1-); tert-alkyl(C12-C14)ammonium [[1-[[5-(1,1-dimethylpropyl)-2-hydroxy-3-nitrophenyl]azo]-2-naphthalenolato(2-)]-[1-[(2-hydroxy-5-nitrophenyl)azo]-2-naphthalenolato(2-)]]-chromate(1-); tert-alkyl(C12-C14)ammonium ((1-(4(or 5)-nitro-2-oxidophenylazo)-2-naphtholato)(1-(3-nitro-2-oxido-5-pentylphenylazo)-2-naphtholato))chromate(1-)
EC number: 403-720-7 | CAS number: 117527-94-3 NOIR ORASOL 9342A; NOIR ORASOL RLI; ORASOL BLACK 9342A; ORASOL BLACK RLI; SAVINYL NOIR 2R
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Not readily biodegradable according to OECD criteria.
Key value for chemical safety assessment
Additional information
In a ready biodegradability study according to OECD 301 B and under GLP the test substance was assessed over a 28 day period by the Modified Sturm Test (RCC Notox B.V. 1989). The nominal test concentrations were 10 and 20 mg/L. The biodegradation was found to be 14.1 % and 3.5 % for 10 mg/L and 20 mg/L test substance, respectively. The reference compound sodium acetate degraded with more than 60% during the exposure period, thus confirming suitability of the activated sludge. These findings are supported by a second study according to OECD 301 (Ciba-Geigy Ltd. 1986). The test substance was 13 % biodegradable after 28 d for 10 mg/L and 8 % biodegradable after 28 d for 20 mg/L. Therefore, the test substance is considered as poorly biodegradable.
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