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:
2 (reliable with restrictions)

Data source

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

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
OECD Guideline 301 D (Ready Biodegradability: Closed Bottle Test)
Deviations:
not specified
Qualifier:
according to
Guideline:
EU Method C.4-E (Determination of the "Ready" Biodegradability - Closed Bottle Test)
Deviations:
not specified
GLP compliance:
not specified

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
No details

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
not specified
Duration of test (contact time):
28 d
Initial test substance concentrationopen allclose all
Initial conc.:
4.1 mg/L
Based on:
test mat.
Initial conc.:
2.05 mg/L
Based on:
test mat.
Parameter followed for biodegradation estimation
Parameter followed for biodegradation estimation:
O2 consumption
Details on study design:
Two flasks for each test.
Analyses done at 0, 7, 14, 21 and 28 days.
Reference substance
Reference substance:
benzoic acid, sodium salt
Remarks:
At 2 and 4 mg/l

Results and discussion

% Degradation
Parameter:
% degradation (O2 consumption)
Value:
1.4
Sampling time:
28 d

BOD5 / COD results

BOD5 / COD
Parameter:
BOD5
Value:
0.02 g O2/g test mat.
Results with reference substance:
Biodegradation after 28 days: 77.5 %
BOD = 1.3 g O2/g

Any other information on results incl. tables

Validity criteria

- O2 consumption in control test < 1.5 mg/l at 28 days

- residual concentration od test material > 0.5 mg:/l

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Interpretation of results:
under test conditions no biodegradation observed
Conclusions:
With a biodegradabilty of 1.4 % after 28 days, Bromo-1-pentane is determined as no biodegradable.
Executive summary:

The biodegradability study of Bromo-1 -pentane gives a maximum biodegradation level of 1.4 % in 28 days.

The 10-day window can't be determined.
The validity criteria of the method were respected.

According to these criteria the test item cannot be considerd as ready biodegradable.