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)
Rationale for reliability incl. deficiencies:
other: Non-GLP guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1990
Report Date:
1990

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
ISO 7827 (Evaluation in an Aqueous Medium of the "Ultimate" Aerobic Biodegradability of Organic Compounds - Method by Anlaysis of Dissolved Organic Carbon (DOC))
GLP compliance:
no

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report): 4,4-Dimethyl-3-hydroxy-2H-furanon
Purity: no data
Water solubility: good

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge, domestic (adaptation not specified)
Duration of test (contact time):
21 d
Initial test substance concentration
Initial conc.:
20.1 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

% Degradation
Parameter:
% degradation (DOC removal)
Value:
92
Sampling time:
21 d
Details on results:
Kinetic of test substance (in %):
= 16 after 1 day(s)
= 27 after 7 day(s)
= 84 after 14 day(s)
= 82 after 15 day(s)
= 92 after 21 day(s)
Kinetic of control substance (in %):
= 83 after 7 day(s)

Applicant's summary and conclusion

Interpretation of results:
readily biodegradable