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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:
2010-09-06 2011-01-11
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2011
Report date:
2011

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 301 F (Ready Biodegradability: Manometric Respirometry Test)
Deviations:
no
GLP compliance:
yes (incl. QA statement)

Test material

Constituent 1
Reference substance name:
LCE10035
IUPAC Name:
LCE10035
Details on test material:
- Name of test material (as cited in study report):LCE10035
- Substance type:UVCB
- Physical state:solid pellets , cream coloured
- Analytical purity:100%

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge (adaptation not specified)
Details on inoculum:
Activated sludge from the municipal sewage treatment plant Reutlingen-West
was washed two times with tap water and filtered (Liquid jet vacuum pump with
Filter paper circles, Schleicher & Schuell); 1 g of the wet filtrate corresponded
to approximately 60 mg suspended solids. Using a test volume of 250 mL,
100 mg of the wet filtrate were inserted per flask, corresponding to 24 mg suspended
solids per litre.
Duration of test (contact time):
28 d
Initial test substance concentration
Initial conc.:
ca. 100 mg/L
Based on:
act. ingr.
Parameter followed for biodegradation estimation
Parameter followed for biodegradation estimation:
O2 consumption
Reference substance
Reference substance:
benzoic acid, sodium salt

Results and discussion

% Degradation
Parameter:
% degradation (TOC removal)
Value:
ca. 72.3
Sampling time:
28 d
Remarks on result:
other: 28days
Details on results:
The test item LCE 10035 achieved 72.3 % biodegradation in 28 days (10 days window: 26.5 %) in a Manometric Respirometry Test conducted according to OECD-Guideline 301 F. The test item LCE 10035 is readily biodegradable not meeting the 10 days window.

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Interpretation of results:
readily biodegradable, but failing 10-day window
Conclusions:
The test item LCE 10035 achieved 72.3 % biodegradation in 28 days
(10 days window: 26.5 %) in a Manometric Respirometry Test conducted
according to OECD-Guideline 301 F.
The test item LCE 10035 is readily biodegradable not meeting the 10 days
window
Executive summary:

The validity criteria of OECD-Guideline 301 F are accomplished: - Maximum BOD-difference in flasks 1 + 2 at the end of the test: 15.4 % (nominal value:

The test item LCE 10035 achieved 72.3 % biodegradation in 28 days (10 days window: 26.5 %) in a Manometric Respirometry Test conducted according to OECD-Guideline 301 F. The test item LCE 10035 is readily biodegradable not meeting the 10 days window.

As the 10 days windows criteria is not requested for surfactants. the substance is considered as readily biodegradable.