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Environmental fate & pathways

Biodegradation in water: screening tests

Administrative data

Endpoint:
biodegradation in water: screening tests
Type of information:
migrated information: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Daat published in a peer reviewed handbook.
Cross-reference
Reason / purpose for cross-reference:
reference to same study

Data source

Reference
Reference Type:
review article or handbook
Title:
Handbook of Environmental Data on Organic Chemicals
Author:
Verschueren, K.
Year:
1983
Bibliographic source:
Handbook of Environmental Data on Organic Chemicals, 2nd Ed. (1983)

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
Biodegradation of urea by psychrophilic bacteria in an aqueous test system.
GLP compliance:
not specified

Test material

Constituent 1
Reference substance name:
Urea
EC Number:
200-315-5
EC Name:
Urea
Cas Number:
57-13-6
IUPAC Name:
urea
Details on test material:
No further details
Specific details on test material used for the study:
Details on properties of test surrogate or analogue material (migrated information):
Not relevant

Study design

Oxygen conditions:
not specified
Inoculum or test system:
other: Psychrophilic bacteria
Duration of test (contact time):
1 h
Details on study design:
No further information

Results and discussion

Preliminary study:
No preliminary study
Test performance:
No information
Details on results:
The maximum degradation rate per hour at 20°C was 11.6 mg/L
The average degradation rate per hour at 20 ⁰C was 10.9 mg/L
The maximum degradation rate per hour at 2 ⁰C was 4.0 mg/L
The average degradation rate per hour at 2 ⁰C was 3.2 mg/L.

Any other information on results incl. tables

The maximum degradation rate per hour at 20 ⁰C was 11.6 mg/L. The average degradation rate per hour at 20 ⁰C was 10.9 mg/L. The maximum degradation rate per hour at 2 ⁰C was 4.0 mg/L. The average degradation rate per hour at 2 ⁰C was 3.2 mg/L.

Applicant's summary and conclusion

Validity criteria fulfilled:
not specified
Interpretation of results:
readily biodegradable
Conclusions:
Rapid biodegradation of urea was seen under the conditions of this study.
Executive summary:

The degradation of urea was investigated in psychrophilic bacteria in an aqueous test system. The maximum degradation rate per hour at 20 ⁰C was 11.6 mg/L. The average degradation rate per hour at 20 ⁰C was 10.9 mg/L. The maximum degradation rate per hour at 2 ⁰C was 4.0 mg/L. The average degradation rate per hour at 2 ⁰C was 3.2 mg/L.