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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
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study without detailed documentation
Qualifier:
according to
Guideline:
OECD Guideline 301 D (Ready Biodegradability: Closed Bottle Test)
Deviations:
not specified
Qualifier:
according to
Guideline:
EU Method C.4-E (Determination of the "Ready" Biodegradability - Closed Bottle Test)
Deviations:
not specified
GLP compliance:
yes
Inoculum or test system:
not specified
Reference substance:
acetic acid, sodium salt
Key result
Parameter:
not specified
Value:
2.1
Sampling time:
28 d
Details on results:
Points of degradation plot (test substance):
14.7 % degradation after 7 d
19.5 % degradation after 14 d
10.8 % degradation after 21 d
2.1 % degradation after 28 d
Results with reference substance:
Points of degradation plot (reference substance):
74.6 % degradation after 7 d
78.8 % degradation after 14 d
85.3 % degradation after 21 d
82.7 % degradation after 28 d
Validity criteria fulfilled:
not specified
Interpretation of results:
not readily biodegradable
Conclusions:
The test item was determined to be 2.1 % biodegradable after 28 days and cannot be considered readily biodegrable, but not displaying inhibitory effects on the bacteria inoculum at the concentration (2mg/L) used.

Description of key information

Study conducted to recognised testing guidelines with GLP certification.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed
Type of water:
freshwater

Additional information