Registration Dossier

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
Reliability:
1 (reliable without restriction)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2010
Report Date:
2010

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 301 B (Ready Biodegradability: CO2 Evolution Test)
Deviations:
not specified
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge, non-adapted
Details on inoculum:
The sludge was taken from the activation basin of the domestic sewage treatment plant in D-67480 Edenboken. It was filtrated, washed with tap water twice, then washed with and resuspended in test medium. It was then aerated. The dry matter was determined with 4040 mg suspended solids/liter
Duration of test (contact time):
ca. 29 d
Initial test substance concentration
Initial conc.:
ca. 20 mg/L
Based on:
COD
Parameter followed for biodegradation estimation
Parameter followed for biodegradation estimation:
inorg. C analysis
Reference substance
Reference substance:
aniline

Results and discussion

% Degradationopen allclose all
Parameter:
other: % biodegradation
Value:
ca. 19.4
Sampling time:
4 d
Remarks on result:
other: mean
Parameter:
other: % biodegradation
Value:
ca. 46.8
Sampling time:
9 d
Remarks on result:
other: mean
Parameter:
other: % biodegradation
Value:
ca. 60.3
Sampling time:
11 d
Remarks on result:
other: mean
Parameter:
other: % biodegradation
Value:
ca. 72.5
Sampling time:
15 d
Remarks on result:
other: mean
Parameter:
other: % biodegradation
Value:
ca. 76.6
Sampling time:
29 d
Remarks on result:
other: mean

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Interpretation of results:
readily biodegradable
Conclusions:
The test item SOPHOROLIPIDS is considered as "readily biodegradable",
The degree of biodegradation reached 76.6 % after 28days,
The 10 days window began on day 3, at its end; 68 % were reached surpassing the pass level of 60% given in the OECD guideline,
The abiotic degradation was <2%