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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:
20/10/2016 - 19/12/2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 301 D (Ready Biodegradability: Closed Bottle Test)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Specific details on test material used for the study:
Test item was kept refrigerated in an airtight container, under a nitrogen atmosphere.
Oxygen conditions:
aerobic
Inoculum or test system:
natural water
Duration of test (contact time):
ca. 28 d
Initial conc.:
ca. 9.07 mg/L
Reference substance:
benzoic acid, sodium salt
Key result
Parameter:
% degradation (O2 consumption)
Value:
0
Sampling time:
28 d
Parameter:
% degradation (test mat. analysis)
Value:
4
Sampling time:
28 d
Validity criteria fulfilled:
yes
Interpretation of results:
not readily biodegradable
Conclusions:
In the test suspensions after 28 days, the degradability based on the BOD was av. 0%, and the degradability based on the residual amount of the test substance was av. 4%. No peak attributed to transformation product was detected on the GC chromatogram. It is concluded that the test substance is not readily biodegradable.
Executive summary:

It is concluded that the test substance is not readily biodegradable and no transformation product is generated under the conditions of this test.

Description of key information

Key value for chemical safety assessment

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

Additional information