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Environmental fate & pathways

Biodegradation in water: screening tests

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Administrative data

Endpoint:
biodegradation in water: ready biodegradability
Type of information:
experimental study
Adequacy of study:
key study
Study period:
21.6.2001 - 2.7.2001
Reliability:
1 (reliable without restriction)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2001
Report Date:
2001

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
other: OECD Test Guideline 301 B and EC Directive 92/69/EEC,C.4-C.
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
Dusantox L Batch No.: Dusantox L 7/2000
Date of manufacture: 12/2000
Stability: > 1 year at room temperature

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge, non-adapted
Details on inoculum:
from Marl-Ost municipal sewage treatment plant
Duration of test (contact time):
<= 29 d
Initial test substance concentration
Initial conc.:
>= 10 - <= 20 mg/L
Based on:
DOC
Parameter followed for biodegradation estimation
Parameter followed for biodegradation estimation:
CO2 evolution
Reference substance
Reference substance:
benzoic acid, sodium salt
Remarks:
Sodium benzoate, Microselect 99,5 % Fluka

Results and discussion

% Degradation
Parameter:
% degradation (CO2 evolution)
Value:
46
Sampling time:
28 d
Details on results:
Points of degradation plot (test substance):
1 % degradation after 2 d
2 % degradation after 5 d
7 % degradation after 9 d
25 % degradation after 14 d
37 % degradation after 19 d
44 % degradation after 23 d
45 % degradation after 28 d

BOD5 / COD results

Results with reference substance:
Points of degradation plot (reference substance):
43 % degradation after 2 d
73 % degradation after 5 d
78 % degradation after 9 d
81 % degradation after 14 d
84 % degradation after 19 d
93 % degradation after 23 d
93 % degradation after 28 d

Applicant's summary and conclusion

Interpretation of results:
other: not readily biodegradable