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Environmental fate & pathways

Biodegradation in water: screening tests

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Administrative data

Endpoint:
biodegradation in water: inherent biodegradability
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
1987
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1987
Report date:
1987

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 302 B (Inherent biodegradability: Zahn-Wellens/EMPA Test)
GLP compliance:
not specified

Test material

Constituent 1
Chemical structure
Reference substance name:
2-[[4-[(2-cyano-3-nitrophenyl)azo]-m-tolyl](2-acetoxyethyl)amino]ethyl acetate
EC Number:
250-061-4
EC Name:
2-[[4-[(2-cyano-3-nitrophenyl)azo]-m-tolyl](2-acetoxyethyl)amino]ethyl acetate
Cas Number:
30124-94-8
Molecular formula:
C21H21N5O6
IUPAC Name:
2-{[2-(acetyloxy)ethyl]({4-[(E)-2-(2-cyano-4-nitrophenyl)diazen-1-yl]phenyl})amino}ethyl acetate
Test material form:
solid
Details on test material:
Terasil Rot 3BLN

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge (adaptation not specified)
Duration of test (contact time):
28 d
Initial test substance concentration
Initial conc.:
46 mg/L
Based on:
TOC
Parameter followed for biodegradation estimation
Parameter followed for biodegradation estimation:
TOC removal

Results and discussion

% Degradation
Parameter:
% degradation (TOC removal)
Value:
62
Sampling time:
28 d

BOD5 / COD results

BOD5 / CODopen allclose all
Parameter:
COD
Value:
1 386 mg O2/g test mat.
Parameter:
BOD5
Value:
25 mg O2/g test mat.

Applicant's summary and conclusion

Validity criteria fulfilled:
not specified
Interpretation of results:
inherently biodegradable, not fulfilling specific criteria
Conclusions:
The substance is considered to be inherently biodegradable. However, it cannot be excluded that the substance immediately adsorbed to activated sludge particles. The COD/BOD5 measurements do not indicate any potential for ready biodegradation.