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Environmental fate & pathways

Biodegradation in water: screening tests

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Reference
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:
guideline study with acceptable restrictions
Remarks:
guideline study (no GLP)
Qualifier:
according to
Guideline:
ISO 7827 (Evaluation in an Aqueous Medium of the "Ultimate" Aerobic Biodegradability of Organic Compounds - Method by Analysis of Dissolved Organic Carbon (DOC))
GLP compliance:
no
Oxygen conditions:
aerobic
Inoculum or test system:
sewage, domestic, non-adapted
Details on inoculum:
- Source of inoculum/activated sludge (e.g. location, sampling depth, contamination history, procedure): Sewage from wastewater treatment plant Edenkoben, sampling date: 1989- 11-14.
- Pre-treatment: none
- Amount of inoculum: 0.5 mL sewage/L
Duration of test (contact time):
28 d
Initial conc.:
ca. 19 mg/L
Based on:
test mat.
Parameter followed for biodegradation estimation:
DOC removal
Details on study design:
TEST SYSTEM
- Number of culture flasks/concentration: 2
- Test performed in open system: yes

SAMPLING
- Sampling frequency: every 2-7 days for at least 28 days

CONTROL AND BLANK SYSTEM
- Inoculum blank: yes
- Abiotic sterile control: yes
- Toxicity control: yes
- Inhibition of the inoculum: yes
Reference substance:
benzoic acid, sodium salt
Parameter:
% degradation (DOC removal)
Value:
< 15
Sampling time:
28 d
Details on results:
< 15% after 0, 1, 3, 7, 14, 21, 28 d
Results with reference substance:
ca. 10% after 1 day
> 95% after 3 and 7 days
Validity criteria fulfilled:
yes
Interpretation of results:
other: poorly biodegradable
Conclusions:
The test substance was degraded <15% (DOC removal) by 28 days.
Executive summary:

The biodegradability of the test substance was tested in accordance with ISO 7827. The test substance was degraded <15% via DOC removal at 28 days.

Description of key information

The test substance was degraded <15% via DOC removal at 28 days.

Key value for chemical safety assessment

Additional information

Value used for CSA:

Biodegradation in water: Not readily biodegradable