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Diss Factsheets

Environmental fate & pathways

Biodegradation in water: screening tests

Administrative data

Endpoint:
biodegradation in water: ready biodegradability
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1992
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study performed according to current OECD-Guideline and GLP

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1992
Report date:
1992

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 301 E (Ready biodegradability: Modified OECD Screening Test)
Deviations:
no
GLP compliance:
yes

Test material

Constituent 1
Chemical structure
Reference substance name:
2,5-dimethoxyaniline
EC Number:
203-040-9
EC Name:
2,5-dimethoxyaniline
Cas Number:
102-56-7
Molecular formula:
C8H11NO2
IUPAC Name:
2,5-dimethoxyaniline

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge, domestic, non-adapted
Details on inoculum:
sewage out of domestic waste-water treatment of Frankfurt-Sindlingen
Inoculum-quantity: 0.5 mg/l
Inoculum - after clearing
filtration done with fluted filter
Duration of test (contact time):
42 d
Initial test substance concentration
Initial conc.:
39.1 mg/L
Based on:
DOC
Reference substance
Reference substance:
benzoic acid, sodium salt

Results and discussion

% Degradationopen allclose all
Parameter:
% degradation (DOC removal)
Value:
31
Sampling time:
42 d
Parameter:
% degradation (DOC removal)
Value:
5
Sampling time:
7 d
Parameter:
% degradation (DOC removal)
Value:
9
Sampling time:
14 d
Parameter:
% degradation (DOC removal)
Value:
10
Sampling time:
21 d
Parameter:
% degradation (DOC removal)
Value:
23
Sampling time:
28 d
Details on results:
32% Degradation at 35 d DOC removal

BOD5 / COD results

Results with reference substance:
DOC removal
3 h 25 % degradation
1 d 27 % degradation
7 d 96 % degradation

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Interpretation of results:
other: The test substance is not readily biodegradable, but it is partly biodegradable.
Conclusions:
The DOC removal was 31 % during 42 d. The value of 70 % within 28 d according to guideline was not reached.
Executive summary:

The DOC removal was 31 % during 42 d. The value of 70 % within 28 d according to guideline was not reached.