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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:
2018
Reliability:
1 (reliable without restriction)
Qualifier:
equivalent or similar to
Guideline:
OECD Guideline 301 F (Ready Biodegradability: Manometric Respirometry Test)
GLP compliance:
yes (incl. certificate)
Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge, non-adapted
Duration of test (contact time):
28 d
Initial conc.:
100 mg/L
Based on:
test mat.
Parameter followed for biodegradation estimation:
O2 consumption
Parameter:
% degradation (CO2 evolution)
Value:
> 63.8
Sampling time:
28 d
Details on results:
On day 28 of the test of susceptibility to ultimate aerobic biodegradation, by respirometry manometric, the distribution of the organic part of the test material has reached 63.8%.
Threshold level for high biodegradability, 60% TZT for the respirometric method, was reached on the 12th day.
In fact, this 60% threshold has been reached in a 10-day window. 10-day the window started when the degree of biodegradation reached 10% TZT (after 1.5 days) and ended after 11.5 days (i.e. before day 28 of the test) when biodegradation has reached 58%.
The delay phase was 1.5 days and the decomposition phase was 10 days.
10-day window: This is the period of ten days immediately after reaching 10% distribution.
Based on the results obtained, it can be concluded that the ascorbate part of the material in principle, the tested person is highly susceptible to aerobic biodegradation in the aquatic environment.

Validity criteria fulfilled:
no
Interpretation of results:
readily biodegradable
Conclusions:
ased on the results obtained, it can be concluded that the ascorbate part of the material in principle, the tested person is highly susceptible to aerobic biodegradation in the aquatic environment.

Description of key information

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information