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Environmental fate & pathways

Biodegradation in water: screening tests

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Reference
Endpoint:
biodegradation in water: ready biodegradability
Type of information:
experimental study
Adequacy of study:
key study
Study period:
18 November 2015 - 17 December 2015
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
Qualifier:
according to guideline
Guideline:
EU Method C.4-D (Determination of the "Ready" Biodegradability - Manometric Respirometry Test)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- Lot/batch No.of test material: 1023R25811
- Expiration date of the lot/batch: 14 September 2019
- Purity: 100%

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: Room temperature

TREATMENT OF TEST MATERIAL PRIOR TO TESTING
- Treatment of test material prior to testing:
- Preliminary purification step (if any):
- Final dilution of a dissolved solid, stock liquid or gel:
- Final preparation of a solid:
Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge (adaptation not specified)
Duration of test (contact time):
28 d
Initial conc.:
50 mg/L
Based on:
other: O2
Parameter followed for biodegradation estimation:
O2 consumption
Reference substance:
benzoic acid, sodium salt
Key result
Parameter:
% degradation (O2 consumption)
Value:
10
Sampling time:
1 d
Key result
Parameter:
% degradation (O2 consumption)
Value:
66
Sampling time:
7 d
Key result
Parameter:
% degradation (O2 consumption)
Value:
94
Sampling time:
28 d
Details on results:
Substances are considered to be readily biodegradable in this type of test if oxygen consumption is equal to or greater than 60% of the ThOD of the test mixtures within ten days of the consumption achieving 10%.
The test was considered to be valid.
Key result
Parameter:
ThOD
Value:
2.6 mg O2/g test mat.
Validity criteria fulfilled:
yes
Interpretation of results:
readily biodegradable
Conclusions:
Mean oxygen consumption in mixtures containingthe test substance was equivalent to 10% of the theoretical value (25 mg O2/500 mL) after approximately 1 day, 66% after approximately 7 days and 94% at the end of the test (Day 28).
Substances are considered to be readily biodegradable in this type of test if oxygen consumption is equal to or greater than 60% of the ThOD of the test mixtures within ten days of the consumption achieving 10%. Therefore, the test substance was considered to be readily biodegradable under the conditions of this test.

Description of key information

Mean oxygen consumption in mixtures containing the test substance was equivalent to 10% of the theoretical value (25 mg O2/500 mL) after approximately 1 day, 66% after approximately 7 days and 94% at the end of the test (Day 28).

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information