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Environmental fate & pathways

Biodegradation in water: screening tests

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Endpoint:
biodegradation in water: ready biodegradability
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1974
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Basic data given, acceptable for assessment
Qualifier:
no guideline available
Principles of method if other than guideline:
Standard test according to internal SOP.
GLP compliance:
no
Oxygen conditions:
aerobic
Inoculum or test system:
water (not specified)
Details on study design:
None
Remarks on result:
not measured/tested
Parameter:
BOD5
Value:
240 mg O2/g test mat.
Results with reference substance:
None

None

Validity criteria fulfilled:
yes
Interpretation of results:
under test conditions no biodegradation observed
Conclusions:
BOD: 240 mg O2/g test mat.
Executive summary:

A study was performed to determine the ready biodegradation of the test item. The BOD of the test item is: 240 mg O2/g test mat.

Endpoint:
biodegradation in water: ready biodegradability
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1974
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Basic data given, acceptable for assessment
Qualifier:
no guideline available
Principles of method if other than guideline:
Standard test according to internal SOP.
GLP compliance:
no
Oxygen conditions:
aerobic
Inoculum or test system:
water (not specified)
Details on study design:
None
Remarks on result:
not measured/tested
Key result
Parameter:
COD
Value:
586 mg O2/g test mat.
Results with reference substance:
None

None

Validity criteria fulfilled:
yes
Interpretation of results:
under test conditions no biodegradation observed
Conclusions:
COD: 586 mg O2/g test mat.
Executive summary:

A study was performed to determine the ready biodegradation of the test material.

COD: 586 mg O2/g test mat.

 

Description of key information

The ready biodegradability of the substance was determined.

Key value for chemical safety assessment

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

Additional information

A key study was performed to determine the ready biodegradation of the substance. The Chemical Oxygen Demand of the test item was determined to be 586 mg/g O2, whereas the Biological Oxygen Demand of the substance was determined to be 0 mg/g O2. Correspondingly, the calculation of the BOD5/COD quotient cannt be performed and is regarded as zero.


In the supporting studies, the Chemical Oxygen Demand of the test item was determined to be 897 mg/g O2, whereas the Biological Oxygen Demand of the test item was determined to be 240 mg/g O2. The corresponding BOD5/COD quotient is about 0.27 indicating the test substance to be not biodegradable.