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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:
1975
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study without detailed documentation
Qualifier:
according to
Guideline:
OECD Guideline 301 C (Ready Biodegradability: Modified MITI Test (I))
GLP compliance:
yes (incl. certificate)
Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge, non-adapted
Details on inoculum:
- Concentration of sludge: 30 ppm
Duration of test (contact time):
2 wk
Initial conc.:
100 other: ppm
Based on:
ThCO2
Parameter followed for biodegradation estimation:
O2 consumption
Parameter followed for biodegradation estimation:
TOC removal
Key result
Parameter:
% degradation (O2 consumption)
Value:
0
Sampling time:
14 d
Key result
Parameter:
% degradation (TOC removal)
Value:
0
Sampling time:
14 d
Remarks on result:
other: negative value obtained
Parameter:
% degradation (test mat. analysis)
Value:
6.2
Sampling time:
14 d
Validity criteria fulfilled:
not specified
Interpretation of results:
not readily biodegradable
Conclusions:
No biodegradation of the test item was observed (0%) after 14 days. Therefore, the test item is not readily biodegradable.
Executive summary:

A screening test of ready biodegradability of the test substance was performed according to the Japanese MITI test and OECD Guideline 301C. The substance, present at 100 ppm, reached 0% of its theoretical BOD in 2 weeks, using an activated sludge inoculum at 30 ppm. Therefore, the test item is not readily biodegradable.

Description of key information

Key study. Test method according to OECD 301C / MITI test, GLP study. The test item was not readily biodegradable (0% degradation after 14 days under test conditions).

Key value for chemical safety assessment

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

Additional information