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EC number: 203-596-2 | CAS number: 108-58-7
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
- 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:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 301 F (Ready Biodegradability: Manometric Respirometry Test)
- Deviations:
- no
- GLP compliance:
- yes
- Specific details on test material used for the study:
- Batch No.: 0900243308
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- activated sludge, domestic (adaptation not specified)
- Details on inoculum:
- Aerobic activated sludge (microorganisms from a domestic wastewater treatment plant) was supplied by the sewage treatment plant of Rossdorf, Germany.
- Duration of test (contact time):
- 28 d
- Initial conc.:
- 104.2 mg/L
- Based on:
- test mat.
- Initial conc.:
- 180.2 mg/L
- Based on:
- ThOD
- Remarks:
- ThODNH4
- Parameter followed for biodegradation estimation:
- O2 consumption
- Details on study design:
- The test item Resorcinol diacetate was investigated for its ready biodegradability in a manometric respirometry test over a period of 28 days. The biodegradation was followed by the oxygen uptake of the microorganisms during exposure. As a reference item sodium benzoate was tested simultaneously under the same conditions as the test item, and functioned as a procedure control.
- Reference substance:
- benzoic acid, sodium salt
- Parameter:
- % degradation (O2 consumption)
- Remarks:
- ThODNH4 (theoretical oxygen demand)
- Value:
- 10
- Sampling time:
- 1 d
- Remarks on result:
- other: readily biodegradable
- Key result
- Parameter:
- % degradation (O2 consumption)
- Remarks:
- ThODNH4 (theoretical oxygen demand)
- Value:
- 72
- Sampling time:
- 10 d
- Remarks on result:
- other: readily biodegradable
- Parameter:
- % degradation (O2 consumption)
- Remarks:
- ThODNH4 (theoretical oxygen demand)
- Value:
- 81
- Sampling time:
- 28 d
- Remarks on result:
- other: readily biodegradable
- Details on results:
- The mean biodegradation of 10% of Resorcinol diacetate was reached at day 1 (ThODNH4). At the end of the 10-day window at day 11, the degradation of Resorcinol diacetate was 72% (ThODNH4), the 10 day window criterion was therefore passed. The mean biodegradation at test end after 28 days was 81% (ThODNH4).
- Parameter:
- BOD5
- Value:
- 25 other: mg O2/L
- Remarks on result:
- other: Cumulative Biochemical Oxygen Demand after 1 day
- Key result
- Parameter:
- BOD5
- Value:
- 140 other: mg O2/L
- Remarks on result:
- other: Cumulative Biochemical Oxygen Demand after 10 days
- Parameter:
- BOD5
- Value:
- 160 other: mg O2/L
- Remarks on result:
- other: Cumulative Biochemical Oxygen Demand after 28 days
- Parameter:
- BOD5*100/ThOD
- Value:
- 14 other: %
- Remarks on result:
- other: Percentage Biodegradation based on ThODNH4 after 1 day
- Key result
- Parameter:
- BOD5*100/ThOD
- Value:
- 74 other: %
- Remarks on result:
- other: Percentage Biodegradation based on ThODNH4 after 10 days
- Parameter:
- BOD5*100/ThOD
- Value:
- 79 other: %
- Remarks on result:
- other: Percentage Biodegradation based on ThODNH4 after 28 days
- Results with reference substance:
- Biodegradation based on ThODNH4 of the reference item sodium benzoate: 29% after 1 day; 84% after 10 days and 90% after 28 days.
- Validity criteria fulfilled:
- yes
- Interpretation of results:
- readily biodegradable
- Conclusions:
- The degradation rate of Resorcinol diacetate did reach 60% within the 10-day window. Therefore, Resorcinol diacetate is considered to be readily biodegradable.
- Executive summary:
Resorcinol diacetate is considered to be readily biodegradable.
Reference
Description of key information
The mean biodegradation of 10% of Resorcinol diacetate was reached at day 1 (ThODNH4). At the end of the 10-day window at day 11, the degradation of Resorcinol diacetate was 72% (ThODNH4), the 10 day window criterion was therefore passed. The mean biodegradation at test end after 28 days was 81% (ThODNH4).
Therefore, Resorcinol diacetate is considered to be readily biodegradable.
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable
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