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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:
May 24 - June 22, 1995
Reliability:
1 (reliable without restriction)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1995
Report date:
1995

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
OECD Guideline 301 B (Ready Biodegradability: CO2 Evolution Test)
Deviations:
not specified
Qualifier:
according to guideline
Guideline:
EU Method C.4-C (Determination of the "Ready" Biodegradability - Carbon Dioxide Evolution Test)
Deviations:
not specified
GLP compliance:
yes

Test material

Constituent 1
Chemical structure
Reference substance name:
-
EC Number:
419-690-3
EC Name:
-
Cas Number:
88020-55-7
Molecular formula:
[(C12H25)3NH]4Mo8O26
IUPAC Name:
tridodecylamine hydrate molybdenum

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge (adaptation not specified)
Duration of test (contact time):
28 d
Reference substance
Reference substance:
other: ACETATE DE SODIUM

Results and discussion

% Degradation
Parameter:
% degradation (CO2 evolution)
Value:
5
Sampling time:
28 d
Remarks on result:
other: St dev : no data
Details on results:
Points of degradation plot (test substance):
1 % degradation after 2 d
1 % degradation after 5 d
2 % degradation after 9 d
2.5 % degradation after 14 d
5 % degradation after 29 d

BOD5 / COD results

Results with reference substance:
Points of degradation plot (reference substance):
0 % degradation after 2 d
19.8 % degradation after 5 d
72.9 % degradation after 9 d
92.1 % degradation after 14 d
100 % degradation after 29 d

Applicant's summary and conclusion

Interpretation of results:
other: not readily biodegradable
Conclusions:
Tested concentration = 15 mg TOC/l
The toxicity test showed an absence of inhibitor effect of this test substance.