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Environmental fate & pathways

Biodegradation in water: screening tests

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Endpoint:
biodegradation in water: ready biodegradability
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:
Justification for type of information:
The target substance is hydrolytically unstable with hydrolysis half-life less than 5 minute. The hydrolysis products include 1-butanol and hydrated zirconium dioxide. The inorganic zirconium doxide was considered not relevant to boidegradation and the organic parts have been well-investigated separately.
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.
Parameter followed for biodegradation estimation:
O2 consumption
Key result
Parameter:
% degradation (O2 consumption)
Value:
ca. 68
Sampling time:
5 d
Key result
Parameter:
% degradation (O2 consumption)
Value:
ca. 87
Sampling time:
10 d
Key result
Parameter:
% degradation (O2 consumption)
Value:
ca. 92
Sampling time:
15 d
Key result
Parameter:
% degradation (O2 consumption)
Value:
ca. 92
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 -butanol 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 -butanol 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.