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Environmental fate & pathways

Biodegradation in water: screening tests

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Administrative data

Endpoint:
biodegradation in water: ready biodegradability
Type of information:
migrated information: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1997
Report Date:
1997

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
other: BOD-Test for Insoluble Substances (BODIS)
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Batch no.: 00026032
- Water solubility: unlimited
- Colour: yellowish
- Physical state: liquid

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
sewage, domestic (adaptation not specified)
Details on inoculum:
- Source of inoculum: inoculum from domestic waste water sewage plant Hochdahl
- Concentration of inoculum: 50 mg/L
Duration of test (contact time):
28 d
Initial test substance concentration
Initial conc.:
100 mg/L
Based on:
COD
Parameter followed for biodegradation estimation
Parameter followed for biodegradation estimation:
O2 consumption
Details on study design:
TEST SYSTEM
- Test vessel: flasks with nominal volume of 300 ml
- Fill volume: 200 ml nominal
Reference substance
Reference substance:
other: Sodium acetate trihydrate

Results and discussion

% Degradation
Parameter:
% degradation (O2 consumption)
Value:
67
Sampling time:
28 d
Details on results:
- Degradation kinetic:
Time [d] Degradation [%]
3 7
7 34
14 53
21 63
28 67

BOD5 / COD results

Results with reference substance:
- Degradation [%] after 14 d: 81
- Degradation [%] after 28 d: 81

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Interpretation of results:
readily biodegradable, but failing 10-day window