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EC number: 607-104-0 | CAS number: 225375-65-5
Biodegradation in water: screening tests
Administrative data
- Endpoint:
- biodegradation in water: ready biodegradability
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 1999-08-31 to 1999-12-03
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: OECD study under GLP
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 1 999
- Report date:
- 1999
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 301 A (Ready Biodegradability: DOC Die Away Test)
- GLP compliance:
- yes
Test material
- Reference substance name:
- Silicophosphonat
- IUPAC Name:
- Silicophosphonat
- Details on test material:
- - Name of test material (as cited in study report): Silicophosphonat
- Physical state: Liquid
Constituent 1
Study design
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- activated sludge, domestic, non-adapted
- Details on inoculum:
- Activated sludge from laboratory wastewater plants treating municipal sewage. Concentration of dry substance 30 mg/L
- Duration of test (contact time):
- 28 d
Initial test substance concentrationopen allclose all
- Initial conc.:
- 193 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
- Details on study design:
- TEST CONDITIONS
- Test temperature: not given
- pH: 7.4
- pH adjusted: no
CONTROL AND BLANK SYSTEM
- Inoculum blank: yes
- Control: aniline
- Abiotic control: yes
- Adsorption control: yes
- Inhibition control: yes
Reference substance
- Reference substance:
- aniline
Results and discussion
- Test performance:
- valid
% Degradation
- Parameter:
- % degradation (DOC removal)
- Value:
- < 10
- Sampling time:
- 28 d
- Details on results:
- 10-day window met: no
Degradation degree of test substance <70% within 28 d: no
Degradation degree of the test substance (28d): <10%
Degradation degree of the inhibiton control after 14 days: 50-60%
Degradation degree of the reference substance after 14 days: 80-90%
Physico-chemical elimination (end of test): <10%
Elimination of the test substance by adsorption (day 5): <10%
BOD5 / COD results
- Results with reference substance:
- see above
Applicant's summary and conclusion
- Validity criteria fulfilled:
- yes
- Interpretation of results:
- under test conditions no biodegradation observed
- Conclusions:
- Teh test substance is in this test poorly biodegradable (not readily biodegradable according to OECD criteria)
- Executive summary:
In a OECD 301A test Silicophosphonat was shown to be not readily biodegradable. The biodegradation degree after 28 was <10%. The 10 days window was not passed. The positive control, the inhibiton control, the abiotic control and the adsorption control worked as expected.
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