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EC number: 246-042-5 | CAS number: 24155-42-8
Biodegradation in water: screening tests
Administrative data
- Endpoint:
- biodegradation in water: ready biodegradability
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Study according to internationally accepted guidelines but not GLP compliant.
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 013
- Report date:
- 2013
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- EU Method C.6 (Degradation: Chemical Oxygen Demand)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method C.5 (Degradation: Biochemical Oxygen Demand)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- other: Guidence on the Application of the CLP Criteria
- Deviations:
- no
- GLP compliance:
- no
Test material
- Reference substance name:
- α-(2,4-dichlorophenyl)-1H-imidazole-1-ethanol
- EC Number:
- 246-042-5
- EC Name:
- α-(2,4-dichlorophenyl)-1H-imidazole-1-ethanol
- Cas Number:
- 24155-42-8
- Molecular formula:
- C11H10Cl2N2O
- IUPAC Name:
- 1-(2,4-dichlorophenyl)-2-(1H-imidazol-1-yl)ethan-1-ol
- Test material form:
- solid: crystalline
- Details on test material:
- Test item: IMIDAZOLE ETHANOL (CAS No. 24155-42-8)
Batch No.: L36066N
Physical state: Light-yellow powder
Active ingredient content (titrimetry): 92.1%
Impurities (HPLC): 9.18%
Storage: 15-30°C
Constituent 1
Study design
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- activated sludge, non-adapted
- Details on inoculum:
- 250.0 ml inoculum culture with 1.0 g/l dry substance was made by diluting an appropriate part of stock solution with aerated tap water
- Duration of test (contact time):
- 5 d
Initial test substance concentration
- Initial conc.:
- 69 mg/L
- Based on:
- test mat.
Parameter followed for biodegradation estimation
- Parameter followed for biodegradation estimation:
- other: Pressure (The liberated carbon dioxide is absorbed by sodium hydroxide so the biological oxidation generates vacuum which is registered by the measuring heads.)
- Details on study design:
- This study was performed to evaluate the degradability of Imidazole Ethanol (CAS No. 24155-42-8) in an aerobic mixed bacterial culture on the base of quotient of biochemical oxygen demand (BOD) and chemical oxygen demand (COD). The degradability was calculated from the quotient of BOD5 and COD.
For the test solution 150.0 mg of test item was solved in 2 000 ml aerated tap water so that the nominal concentration was 75.0 mg/l. This test solution was used for both COD and BOD5 determination.
The chemical oxygen demand was determined by the standard dichromate method. Three replicates were measured in the test.
The biochemical oxygen demand of test item is determined by the OxiTop® system. In this test the test solutions are inoculated with mixed aerobe bacterial culture and poured into 500 ml dark glass bottles. The vessels are placed into incubator at 20 ± 2 °C and continuously stirring with magnetic stirrer. The test duration is 5 days. N-Allylthiourea is added to each test vessel for inhibiting of nitrification.
Results and discussion
% Degradationopen allclose all
- Parameter:
- other: values of vacuum
- Value:
- 4.6
- Sampling time:
- 1 d
- Parameter:
- other: values of vacuum
- Value:
- 4.5
- Sampling time:
- 2 d
- Parameter:
- other: values of vacuum
- Value:
- 7.9
- Sampling time:
- 3 d
- Parameter:
- other: values of vacuum
- Value:
- 6.7
- Sampling time:
- 4 d
- Parameter:
- other: values of vacuum
- Value:
- 7.8
- Sampling time:
- 5 d
BOD5 / COD results
BOD5 / CODopen allclose all
- Parameter:
- COD
- Value:
- 1.314 g O2/g test mat.
- Parameter:
- BOD5
- Value:
- 0.102 g O2/g test mat.
- Parameter:
- BOD5*100/COD
- Value:
- 7.8
Applicant's summary and conclusion
- Validity criteria fulfilled:
- yes
- Interpretation of results:
- other: not rapidly degradable
- Conclusions:
- The BOD5/COD ratio is less than 0.5. In this Degradability Test for “Imidazole Ethanol” (CAS No. 24155-42-8) the results indicated that the test item is not rapidly degradable in the aquatic environment.
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