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EC number: 700-345-3 | CAS number: 515851-08-8
Biodegradation in water: screening tests
Administrative data
- Endpoint:
- biodegradation in water: ready biodegradability
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: guideline study and GLP
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 009
- Report date:
- 2009
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 301 B (Ready Biodegradability: CO2 Evolution Test)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method C.4-C (Determination of the "Ready" Biodegradability - Carbon Dioxide Evolution Test)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
Test material
- Reference substance name:
- N4-[3-(1H-imidazol-1-yl)propyl]-2-methylbenzene-1,4-diamine trihydrochloride
- EC Number:
- 700-345-3
- Cas Number:
- 515851-08-8
- Molecular formula:
- C13H21Cl3N4
- IUPAC Name:
- N4-[3-(1H-imidazol-1-yl)propyl]-2-methylbenzene-1,4-diamine trihydrochloride
- Reference substance name:
- [TN]Kn 172[/TN][SPEC][/SPEC][AM]96.2 %[/AM]
- IUPAC Name:
- [TN]Kn 172[/TN][SPEC][/SPEC][AM]96.2 %[/AM]
- Details on test material:
- Name: Kn 172
Batch no.: Kn-Gi 9328-182
Appearance: white powder
Molecular formula: C13H18N4 x 3HCl
Molecular weight: 339.69 g/mol
Purity: NMR: 96.2%, 0.8% EtOH, 1.4% water
Solubility: H2O: >1g/L; EtOH; acetone; CH3CN; DMSO: unknown
Expiry date: 10.06.2013
Storage: fridge 2-8°C, keep away from light and humidity, keep under Ar!
The test item Kn 172 was tested using a concentration of nominally 20 mg organic carbon/
L (corresponding to 42.3 mg Kn 1721L) in test medium following OECD 301B and EUMethod
C.4-C.
Constituent 1
Constituent 2
Study design
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- activated sludge, domestic, non-adapted
- Duration of test (contact time):
- 28 d
Initial test substance concentration
- Initial conc.:
- 42.3 mg/L
- Based on:
- test mat.
Parameter followed for biodegradation estimation
- Parameter followed for biodegradation estimation:
- CO2 evolution
Results and discussion
% Degradation
- Parameter:
- % degradation (CO2 evolution)
- Value:
- 0
- Sampling time:
- 28 d
- Details on results:
- For the test item Kn 172, no relevant degradation was observed.
For the positive control, degradation lay within the usual values.
lf degradation in the toxicity flask is below 25% after 14 days, the test item can be considered
as toxic towards the inoculum. As degradation in the toxicity flask was 29% after 14
days, the test item can be stated as "not toxic towards the inoculum in a concentration of
42.3 mglL". lt is stated, though, that the amount of positive control which was added to the
toxicity flask did not degrade completely, as the lC values in the toxicity flask lay below the
lC values in the positive controls. Therefore, it is believed that a slightly toxic effect might
have taken place. On the other hand, a reaction between test item and positive control
could have produced a substance with worse degradation potential than aniline.
The result of the test can be considered valid.
Any other information on results incl. tables
Reference Substance:
Aniline (Phenylamine. CoHsNH2. CAS-Nr. 62-53-3) was used as readily bio-degradable positive control. A stock solution containing 2.1 glL (nominal) in deionised water was prepared and its organic carbon content was measured with 1707 ppm, resulting in an organic carbon content of 81.2 %.
Applicant's summary and conclusion
- Validity criteria fulfilled:
- yes
- Interpretation of results:
- under test conditions no biodegradation observed
- Conclusions:
- Kn 172 is not readily biodegradable following OECD 301B/EU C.4-C.
- Executive summary:
Summary
Title of Study: Determination of the aerobic ready biodegradability of Kn 172 in the CO2 Evolution Test following OECD 301B resp.
EU C.4.C
Findings and Results: The test item Kn 172 was tested using a concentration of nominally 20 mg organic carbon/L (corresponding to 42.3 mg Kn 172/L) in test medium following OECD 301B and EUMethod C.4-C.
Aniline was chosen as positive control.
Activated sludge was used as inoculum (concentration in the test 25.1 mg dry matter/L).
The test was left running for 28 days.
All validity criteria were met. Degradation of the reference item was 63 % after seven days.
The following data were determined for the test item Kn 172:
10-day-window: not detected
degradation at the end of 10-day-window: none
degradation at the end of the test: none
pass level: 60% at the end of 10-d-window
Therefore, Kn 172 is not readily biodegradable following OECD 301B/EU C.4-C.
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