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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:
2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 301 F (Ready Biodegradability: Manometric Respirometry Test)
GLP compliance:
yes
Oxygen conditions:
aerobic
Inoculum or test system:
sewage, domestic (adaptation not specified)
Details on inoculum:
Biodegradability was assessed using return activated sludge (RAS). The source was the Peppers Ferry Wastewater Treatment Authority treatment plant, located in Fairlawn, VA. Raw RAS was collected on the day of test initiation. The wastewater Authority provided the Total Suspended Solids (TSS) value of 11,000 mg/L for the raw RAS on the day of collection. The raw sludge was filtered through a fine mesh sieve to remove any course particles and aerated until test initiation.
Duration of test (contact time):
28 d
Key result
Parameter:
other: cumulative % ThOD, mean
Value:
37.2
Sampling time:
10 d
Key result
Parameter:
other: cumulative % ThOD, mean
Value:
43.8
Sampling time:
28 d
Validity criteria fulfilled:
yes
Interpretation of results:
not readily biodegradable
Conclusions:
The substance did not degrade to the 60 % level and cannot be considered readily biodegradable.
Executive summary:

The substance did not degrade to the 60 % level and cannot be considered readily biodegradable.

2,4,7,9-tetramethyldecane-4,7-diol was not readily biodegradable under the conditions of the test. Approximately 44 % degraded in 28 days.

Hence it can be considered as inherently but not ultimately biodegradable.

Description of key information

2,4,7,9-tetramethyldecane-4,7-diol was not readily biodegradable under the conditions of the test. Approximately 44 % degraded in 28 days.

Hence, it can be considered as inherently but not ultimately biodegradable.

Key value for chemical safety assessment

Biodegradation in water:
inherently biodegradable
Type of water:
freshwater

Additional information