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EC number: 907-235-6 | CAS number: -
Biodegradation in water: screening tests
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: Study report of GLP guideline study with deficiencies (e.g. reference material not stated, inoculum not specified in detail)
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 1 991
- Report date:
- 1991
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 301 F (Ready Biodegradability: Manometric Respirometry Test)
- Qualifier:
- according to guideline
- Guideline:
- other: EU-Method 79/831/EEC, part C
- GLP compliance:
- yes
- Remarks:
- certificate not included
Test material
- Reference substance name:
- Undecanal
- EC Number:
- 203-972-6
- EC Name:
- Undecanal
- Cas Number:
- 112-44-7
- Molecular formula:
- C11H22O
- IUPAC Name:
- undecanal
- Reference substance name:
- 2-methyldecan-1-al
- EC Number:
- 242-745-6
- EC Name:
- 2-methyldecan-1-al
- Cas Number:
- 19009-56-4
- Molecular formula:
- C11H22O
- IUPAC Name:
- 2-methyldecanal
- Details on test material:
- - Name of test material (as cited in study report): n/i-undecanal
- Substance type: preparation
- Physical state:
- Analytical purity: 35% undecanal, 60% iso-undecanal
- Composition of test material, percentage of components: 60% 2-methyldecanal (CAS 19009-56-4), 35% n-decanal (CAS 772-37-2)
Constituent 1
Constituent 2
Study design
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- activated sludge, domestic, non-adapted
- Details on inoculum:
- - Source of inoculum/activated sludge (e.g. location, sampling depth, contamination history, procedure): Wastewater treatment plant in Frankfurt/Main-Sindlingen, Germany, treating predominantly domestic sewage
- Pretreatment: none
- Initial cell/biomass concentration: 29 mg dw/L - Duration of test (contact time):
- 28 d
Initial test substance concentrationopen allclose all
- Initial conc.:
- 200 mg/L
- Based on:
- test mat.
- Initial conc.:
- 348 mg/L
- Based on:
- COD
Parameter followed for biodegradation estimation
- Parameter followed for biodegradation estimation:
- O2 consumption
- Details on study design:
- TEST CONDITIONS
- Composition of medium: according to guideline
- Additional substrate: no
- Solubilising agent (type and concentration if used): no
- Test temperature: 20 ± 1 °C
- Suspended solids concentration: 29 mg/L
- Continuous darkness: no data
- Other:
TEST SYSTEM
- Culturing apparatus: BOD bottles
- Number of culture flasks/concentration: 2
- Measuring equipment: WTW-BOD-apparatus (manometric determination of oxygen consumption)
- Test performed in open system: no
SAMPLING
- Sampling frequency: samples taken on day: 7, 14, 21 and 28
CONTROL AND BLANK SYSTEM
- Inoculum blank: yes: 1 flask
- Abiotic sterile control: no
- Toxicity control: no
- Other: positive control (reference material + inoculum + mineral medium): 1 flask
Results and discussion
% Degradationopen allclose all
- Parameter:
- % degradation (O2 consumption)
- Value:
- 65
- Sampling time:
- 7 d
- Parameter:
- % degradation (O2 consumption)
- Value:
- > 90
- Sampling time:
- 14 d
- Parameter:
- % degradation (O2 consumption)
- Value:
- > 90
- Sampling time:
- 21 d
- Parameter:
- % degradation (O2 consumption)
- Value:
- > 90
- Sampling time:
- 28 d
Applicant's summary and conclusion
- Validity criteria fulfilled:
- yes
- Interpretation of results:
- readily biodegradable
- Conclusions:
- n/i-undecanal is readily biodegradable according to OECD criteria (> 90% after 28 d; OECD 301F; Hoechst, 1991)
- Executive summary:
The test material was tested for ready biodegradability according to OECD 301F. The inoculum was derived from a wwtp treating predominantely domestice sewage. The type of inoculum was not stated. After 7 d, the degradation was above the pass level of 60%. After 14 d the degradation was greater than 90%. Therefore the test material is assessed as readily biodegradable according to OECD criteria.
The test material contained 60% 2-methyldecanal, which is the branched isomer of n-undecanal, and 35% of the linear undecanal.
A detailed justification of read across is provided in the field Discussion of the endpoint summary of this section.
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