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EC number: 202-764-2 | CAS number: 99-54-7
Biodegradation in water and sediment: simulation tests
Administrative data
Link to relevant study record(s)
- Endpoint:
- biodegradation in water: sediment simulation testing
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Study meets generally accepted scientific principles, basic data given.
- Principles of method if other than guideline:
- degradation of the test substance in estuarine sediment under anaerobic conditions
- GLP compliance:
- not specified
- Oxygen conditions:
- anaerobic
- Inoculum or test system:
- other: black surface sediment
- Duration of test (contact time):
- ca. 1 yr
- Parameter followed for biodegradation estimation:
- other: concentration of the test substance in the supernatant
- % Degr.:
- 50
- Parameter:
- other: loss of compound
- Sampling time:
- 2.4 d
- Transformation products:
- yes
- Remarks:
- No: #1 Identifier: CAS number Identity: 108-42-9
- No.:
- #1
- Conclusions:
- 1,2 -dichloro-4 -nitrobenzene degraded under anaerobic conditions in sediment yielding a half-life of 2.4 days. 3 -Chloroaniline and 3,4 -dichloroaniline were detected as degradation products (Susarla, 1996).
- Executive summary:
1,2 -dichloro-4 -nitrobenzene degraded under anaerobic conditions in sediment yielding a half life of 2.4 days. 3 -Chloroaniline and 3,4 -dichloroaniline were detected as degradation products (Susarla, 1996).
Reference
The loss of the compound in sediment was observed without any lag period. The reaction followed a first-order reaction mechanism with a rate constant 0.289 +/- 0.015 per day. Half live was 2.4 days. In autoclaved sediment (control experiment) the rate constant was 0.0012 per day. Up to half of the 1,2-dichloro-4-nitrobenzene was recovered as 3,4-dichloroaniline, which was degraded less rapidly than the TS
Degradation products: yes
Degradation products (CAS No./EC No./EINECS Name): 108-42-9 203-581-0 3-chloroaniline
Degradation products (CAS No./EC No./EINECS Name): 95-76-1 202-448-4 3,4-dichloroaniline
Description of key information
1,2 -dichloro-4 -nitrobenzene degraded under anaerobic conditions in sediment yielding a half life of 2.4 days. 3 -Chloroaniline and 3,4 -dichloroaniline were detected as degradation products (Susarla, 1996).
Key value for chemical safety assessment
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