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
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Guideline study and GLP

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 F (Ready Biodegradability: Manometric Respirometry Test)
GLP compliance:
yes (incl. certificate)

Test material

Reference
Name:
Unnamed
Type:
Constituent

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge, domestic (adaptation not specified)
Duration of test (contact time):
28 d
Initial test substance concentration
Initial conc.:
ca. 103.5 mg/L
Based on:
ThOD/L
Parameter followed for biodegradation estimation
Parameter followed for biodegradation estimation:
O2 consumption

Results and discussion

% Degradationopen allclose all
Key result
Parameter:
other: ThOD NO3
Value:
14
Sampling time:
28 d
Key result
Parameter:
other: ThOD NH4
Value:
15
Sampling time:
28 d
Details on results:
ThOD NH4
The occurrence of nitrification was considered but not ex-perimentally confirmed. If no nitrification occurs, the mean value for biodegradation was calculated to be 15% after 28 days. Therefore, the 10-day window criterion was not passed.

ThOD NO3
Based on ThODNO3 also no 10-day window was reached and the mean value for biodegradation was calculated to be 14% biodegradation after 28 days.

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Interpretation of results:
other: moderately biodegradable
Conclusions:
The degradation rate of Sa 57 (SAT No. 090073) did not reach 60% within the 10-day window and after 28 days of incubation when no nitrification is considered.
According to the test guideline, nitrification has to be con-sidered if nitrogen is part of the molecule. However, Sa 57 (SAT No. 090073) is considered not to be readily biodegradable.
Executive summary:

The degradation rate of Sa 57 (SAT No. 090073) did not reach 60% within the 10-day window and after 28 days of incubation when no nitrification is considered.

According to the test guideline, nitrification has to be con-sidered if nitrogen is part of the molecule. However, Sa 57 (SAT No. 090073) is considered not to be readily biodegradable.