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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:
calculation (if not (Q)SAR)
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method
Qualifier:
according to
Guideline:
other: expert judgement
Version / remarks:
expert judgement based on estimation and available data
Deviations:
not applicable
GLP compliance:
no
Inoculum or test system:
not specified
Parameter:
other: expert judgement based on available studies
Remarks on result:
other: not determined
Validity criteria fulfilled:
not applicable
Interpretation of results:
not readily biodegradable
Conclusions:
Based on available studies, the tested substance is considered to be not ready biodegradable.
Executive summary:

Based on available studies, the tested substance is considered to be not ready biodegradable.

Endpoint:
biodegradation in water: screening test, other
Remarks:
inherent biodegradability
Type of information:
other: experimental study based on similar substance
Adequacy of study:
key study
Study period:
1995-01-16 to 1995-02-13
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Guideline study, well documented.
Qualifier:
according to
Guideline:
OECD Guideline 302 B (Inherent biodegradability: Zahn-Wellens/EMPA Test)
GLP compliance:
no
Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge (adaptation not specified)
Details on inoculum:
- Test organisms: aquatic mix-population of activated sludge- Source of inoculum: Activated sludge I: municipal ("Kläranlage im Labormaßstab, die mit kommunalen Abwasser betrieben wird (Wupperverband)") Activated sludge II: predominantly municipal ("Kläranlage Odenthal, wird vorwiegend mit kommunalem Abwasser betrieben.") Activated sludge III: predominantly industrial ("Belebungsbecken des Gemeinschaftsklärwerks Bürrig wird vorwiegend mit industriellem Abwasser betrieben.")- Pretreatment: each sludge was washed twice, and separated via centrifugation
Duration of test (contact time):
ca. 28 d
Initial conc.:
ca. 100 mg/L
Based on:
DOC
Parameter followed for biodegradation estimation:
DOC removal
Reference substance:
aniline
Parameter:
% degradation (DOC removal)
Value:
ca. 1
Sampling time:
28 d
Remarks on result:
other: Activated sludge I - municipal
Parameter:
% degradation (DOC removal)
Value:
ca. 2
Sampling time:
28 d
Remarks on result:
other: Activated sludge II - predominantly municipal
Parameter:
% degradation (DOC removal)
Value:
ca. 6
Sampling time:
28 d
Remarks on result:
other: Activated sludge III - predominantly industrial
Results with reference substance:
100% biodegradation after 14 days with each sludge type.
Validity criteria fulfilled:
yes
Interpretation of results:
not inherently biodegradable
Conclusions:
The test substance was tested for inherent biodegradation in a modified Zahn-Wellens test according to OECD 302B. The DOC-removal with three different sludge types was consistently below 10% after 28 days suggesting that the test substance has to be considered as "not inherently biodegradable".
Executive summary:

The test substance was tested for inherent biodegradation in a modified Zahn-Wellens test according to OECD 302B. A significant biological degradation was not noted. The DOC-removal with three different sludge types was consistently below 10% after 28 days.

Description of key information

The test substance was tested for inherent biodegradation in a modified Zahn-Wellens test according to OECD 302B. A significant biological degradation was not noted. The DOC-removal with three different sludge types was consistently below 10% after 28 days.
The EPIWEB estimation showed no readily biodegradation.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information