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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
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Data migrated from NONS with permission to refer granted by ECHA.
Qualifier:
according to
Guideline:
other: 92/69/EEC, C4-C
GLP compliance:
yes
Oxygen conditions:
aerobic
Inoculum or test system:
not specified
Reference substance:
benzoic acid, sodium salt
Parameter:
% degradation (CO2 evolution)
Value:
81
Sampling time:
28 d
Details on results:
15% degradation after 3 days
37% degradation after 8 days
47% degradation after 13 days
69% degradation after 20 days
80% degradation after 27 days
81% degradation after 28 days
Results with reference substance:
29% degradation after 3 days
57% degradation after 8 days
64% degradation after 13 days
74% degradation after 20 days
76% degradation after 27 days
77% degradation after 28 days
Validity criteria fulfilled:
not specified
Interpretation of results:
readily biodegradable, but failing 10-day window
Conclusions:
Based on information provided by ECHA, the test substance is expected to be readily biodegradable but failing to meet the 10-day window criteria.
Endpoint:
biodegradation in water: screening test, other
Remarks:
BOD/COD test
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Data migrated from NONS with permission to refer granted by ECHA.
Qualifier:
according to
Guideline:
other: 92/69/EEC, C5
Qualifier:
according to
Guideline:
other: 96/69/EEC, C6
GLP compliance:
yes
Parameter:
BOD5
Value:
0.51 g O2/g test mat.
Parameter:
COD
Value:
1.56 g O2/g test mat.
Parameter:
BOD5*100/COD
Value:
33 other: Not specified
Validity criteria fulfilled:
not specified
Interpretation of results:
other: BOD/COD assessment rather than direct biodegradation.
Conclusions:
Information on BOD/COD has been provided by ECHA.

Description of key information

Based on information provided by ECHA, the test substance is expected to be readily biodegradable but failing to meet the 10-day window criteria. Based on the high level of CO2 evolution observed in the key study, it is unlikely that the substance will persist in aquatic systems.

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable but failing 10-day window

Additional information