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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:
according to guideline
Guideline:
other: other
Principles of method if other than guideline:
BOD (Standard Methods for the Examination of Water and Wastewater. 1971. 13th Ed. American Public Health Association, New York, NY)
GLP compliance:
not specified
Oxygen conditions:
aerobic
Inoculum or test system:
sewage, domestic, non-adapted
Duration of test (contact time):
ca. 20 d
Initial conc.:
ca. 3 mg/L
Based on:
test mat.
Key result
Parameter:
% degradation (O2 consumption)
Value:
ca. 64
Sampling time:
5 d
Key result
Parameter:
% degradation (O2 consumption)
Value:
ca. 76
Sampling time:
10 d
Key result
Parameter:
% degradation (O2 consumption)
Value:
ca. 81
Sampling time:
15 d
Key result
Parameter:
% degradation (O2 consumption)
Value:
ca. 75
Sampling time:
20 d
Validity criteria fulfilled:
yes
Interpretation of results:
readily biodegradable
Conclusions:
Rapidly biodegradable according to GHS.

Description of key information

Readily biodegradable of 1 -propanol based on BOD method

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

As the target substance hydrolyzes rapidly, the intrinsic properties lies in the hydrolysis products. The 1 -propanol degraded more than 60% after 5 days in a BOD method (Price, et al. 1974).

 

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.