Registration Dossier
Registration Dossier
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EC number: 202-951-9 | CAS number: 101-54-2
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
In a closed bottle test according to later published OECD 301 D, the ready biodegradation of 4-ADPA was investigated (Bayer AG, 2002). After 20 days only 8 % of the test substance was biodegraded and hence 4-ADPA is concluded as not readily biodegradable. A 100% elimination of 4-ADPA was observed in an inherent biodegradability test (Bayer AG, 1989), but ca. 30% 4-ADPA was already eliminated in the first three hours indicating fast adsorption (Currenta, 2009). Nevertheless, 70% biodegradation of 4-ADPA in 7 days can be concluded after subtracting the 30% adsorption, which indicats an inherent, ultimate biodegradability (Currenta, 2009).
Key value for chemical safety assessment
Additional information
In the inherent biodegradability test (Zahn-Wellens), the elimination percentage was re-evaluated with the detected DOC concentration at zero time point (61 mg/l) of the study as initial concentration instead of theoretical DOC (100 mg/l).
Under anaerobic condition using sediment-water enrichment as inoculums, the transformation of 4-Nitro-diphenylamine to 4-ADPA in 3 to 4 weeks and then further to 4-hydroxydiphenylamine in ca. 20 days were observed (Drzyzga, O. et.al, 1995).
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