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: Study performed in accordance with OECD Guideline and compliant with GLP criteria.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1994
Report Date:
1994

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 301 A (Ready Biodegradability: DOC Die Away Test)
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Substance name: Asta-C9 -DioI-Natrium
- Aggregation state: liquid
- Homogeneity: Homogeneous

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge (adaptation not specified)
Details on inoculum:
Municipal activated sludge from laboratory waste water treatment plants fed with municipal and synthetic sludge.
Duration of test (contact time):
21 d
Initial test substance concentrationopen allclose all
Initial conc.:
127 mg/L
Based on:
test mat.
Initial conc.:
20 mg/L
Based on:
DOC
Parameter followed for biodegradation estimation
Parameter followed for biodegradation estimation:
DOC removal
Reference substance
Reference substance:
benzoic acid, sodium salt

Results and discussion

Test performance:
- Phys-chem elimination after 21 days: 10%
- Adaptation phase: 3 days
- Degradation phase: 7 days
% Degradation
Parameter:
% degradation (DOC removal)
Value:
> 89
Sampling time:
21 d
Details on results:
The 10-day window criterion for ready biodegradability is met.

BOD5 / COD results

Results with reference substance:
94% degradation after 1 day.

Any other information on results incl. tables

Elimination of test substance:

Incubation days

Elimination (%)

0

0

1

2

3

3

7

26

10

83

14

87

17

94

20

99

21

89

Applicant's summary and conclusion