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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 with acceptable restrictions
Qualifier:
according to guideline
Guideline:
OECD Guideline 301 D (Ready Biodegradability: Closed Bottle Test)
GLP compliance:
yes
Oxygen conditions:
not specified
Inoculum or test system:
not specified
Duration of test (contact time):
28 d
Reference substance:
not specified
Parameter:
not specified
Value:
5
Sampling time:
28 d

Starting concentration of test chemical: 40 mg/l (31.5 mg carbon/l).

In a second replicate with the same concentration a

biodegradation was only 1 %.

Higher test levels could not be obtained because of the limit of solubility of the test material in chloroform.

This test was conducted from the notifier instead of a test on inherent biodegrability.

The German C.A. did not insist on the conduction of the inherent test as the substance also will not be inherent biodegradable for structural reasons.

Validity criteria fulfilled:
yes
Interpretation of results:
not readily biodegradable
Conclusions:
The test item is not readily biodegradable.

Description of key information

According to the OECD301D test, the degradation of test substance after 28d was 5%. Therefore, the test item is not readily biodegradable.

Key value for chemical safety assessment

Biodegradation in water:
not biodegradable
Type of water:
freshwater

Additional information