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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
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Qualifier:
no guideline followed
Principles of method if other than guideline:
CO2 evolution test
GLP compliance:
not specified
Oxygen conditions:
aerobic
Inoculum or test system:
other: Mixed liquor activated sludge (secondary effluent)
Duration of test (contact time):
ca. 5 d
Initial conc.:
ca. 0.6 mg/L
Based on:
test mat.
Initial conc.:
ca. 5.7 mg/L
Parameter followed for biodegradation estimation:
CO2 evolution
Key result
Parameter:
% degradation (test mat. analysis)
Value:
ca. 10 000
Sampling time:
5 d
Validity criteria fulfilled:
yes
Interpretation of results:
readily biodegradable
Conclusions:
Rapidly biodegradable according to GHS.

Description of key information

Readily biodegradable of triethanolamine based on CO2 evolution method.

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

Biodegradation test was conducted on the target substance following OECD guideline 301D Closed bottle method. The results indicated not readily biodegradable under the test conditions. However, it was not reported whether a toxicity control was conducted and how the initial concentration 3.g mg/l was determined. Further work may needed to investigate the biodegradability of the target substance.

 

As the target substance hydrolyzes rapidly, the intrinsic properties lies in the hydrolysis products. The triethanolamine degraded 100% after 5 days in a CO2 evolution method (West 1996).

 

The inorganic product, Zirconium dioxide, was not considered further in this report as biodegradation and partition coefficient assessments did not apply.

 

Based on these findings, the target substance was considered readily biodegradable.