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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
Reliability:
1 (reliable without restriction)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2007
Report date:
2007

Materials and methods

Test guideline
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 301 C (Ready Biodegradability: Modified MITI Test (I))
Deviations:
yes
Remarks:
The difference of extremes of replicate values of the percentage biodegradation of the test item was 37 % and was over the value of criterion (<20 %)
GLP compliance:
yes

Test material

Constituent 1
Chemical structure
Reference substance name:
3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl methacrylate
EC Number:
218-407-9
EC Name:
3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl methacrylate
Cas Number:
2144-53-8
Molecular formula:
C12H9F13O2
IUPAC Name:
3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl methacrylate
Details on test material:
- Purity: >99 %

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge, non-adapted
Duration of test (contact time):
0 - 28 d
Initial test substance concentration
Initial conc.:
100 mg/L
Based on:
test mat.

Results and discussion

% Degradationopen allclose all
Parameter:
% degradation (O2 consumption)
Value:
2
Sampling time:
28 d
Remarks on result:
other: average determined by biological oxygen demand
Parameter:
% degradation (test mat. analysis)
Value:
15
Sampling time:
28 d
Remarks on result:
other: average determined by gas chromatography
Details on results:
BOD analysis, replicate results: -4%, 5% and 6% degradation
GC test material analysis results: -2%, 11% and 35% degradation

Any other information on results incl. tables

Some of the test item was converted into methacrylic acid and 3,3,4,4,5,5,6,6,7,7,8,8,8- tridecafluorooctan-l-ol under the test conditions of this study. Methacrylic acid seemed to be biodegraded by microorganisms except one transferred to the CO2 absorbent, whereas the rest of the test item and 3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafiuorooctan-l-ol were not biodegraded by microorganisms and remained.

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Interpretation of results:
other: not readily biodegradable
Conclusions:
not readily biodegradable
Executive summary:

A 28 day biodegradation by microorganisms study was conducted on the test substance. Degradation was determined by BOD (oxygen consumption measuring apparatus) and by test substance analysis (gas chromatography, GC). The average values for percent degradation were 2% and 14% for BOD and GC, respectively. These values did not pass the 10-day or 14-day window, therefore the test substance is not readily biodegradable.

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