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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:
1991
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study without detailed documentation
Qualifier:
according to
Guideline:
OECD Guideline 301 B (Ready Biodegradability: CO2 Evolution Test)
Deviations:
not specified
GLP compliance:
not specified
Specific details on test material used for the study:
Not available.
Oxygen conditions:
aerobic
Inoculum or test system:
not specified
Duration of test (contact time):
28 d
Parameter followed for biodegradation estimation:
CO2 evolution
Reference substance:
benzoic acid, sodium salt
Key result
Parameter:
% degradation (CO2 evolution)
Value:
>= 6 - <= 17
Sampling time:
28 d
Remarks on result:
other: Not readily biodegradable
Results with reference substance:
Na-Benzoate attained 74% degradation after 6 days.

Test Substance

Reference Substance

Day

% degradation

Day

% degradation

5

0

6

74

12

5, 0

 

 

15

9, 0

 

 

20

9, 0

 

 

23

9, 5

 

 

26

10, 5

 

 

44

17, 5

 

 

 

Validity criteria fulfilled:
not specified
Interpretation of results:
not readily biodegradable
Conclusions:
The test material achieved 6-17% degradation after 28 days and is not considered to be readily biodegradable. After 44 days 5-17% degradation was achieved.

Description of key information

The test material achieved 6-17% degradation after 28 days and is not considered to be readily biodegradable (under OECD 301B). After 44 days 5-17% degradation was achieved.

The Sodium-Benzoate reference substance attained 74% degradation after 6 days.

Key value for chemical safety assessment

Biodegradation in water:
not biodegradable
Type of water:
freshwater

Additional information