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Environmental fate & pathways

Biodegradation in water: screening tests

Administrative data

Endpoint:
biodegradation in water: ready biodegradability
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)

Data source

Reference
Reference Type:
other: Prediction model
Title:
Bio-degradation in water by Environmental Science Center’s PBT profiler
Author:
Environmental Science Center
Year:
2010
Bibliographic source:
PBT profiler, Office of Chemical Safety and Pollution Prevention , U.S. Environmental Protection Agency; version 1.301

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other: Modelling database
Principles of method if other than guideline:
PBT profiler database
GLP compliance:
no

Test material

Constituent 1
Chemical structure
Reference substance name:
4-nitro-o-xylene
EC Number:
202-761-6
EC Name:
4-nitro-o-xylene
Cas Number:
99-51-4
Molecular formula:
C8H9NO2
IUPAC Name:
4-nitro-o-xylene
Details on test material:
Substance Name : 4-nitro-o-xylene
Molecular Formula : C8H9NO2
Physical state : Liquid

Study design

Oxygen conditions:
other: Estimation
Duration of test (contact time):
38 d
Parameter followed for biodegradation estimation
Parameter followed for biodegradation estimation:
test mat. analysis
Reference substance
Reference substance:
not specified

Results and discussion

% Degradation
Parameter:
other: Half-life
Value:
50
Sampling time:
38 d
Remarks on result:
other: 38 d = 912 h
Details on results:
Half life = 38 days

Applicant's summary and conclusion

Interpretation of results:
readily biodegradable
Conclusions:
The half life period of 4-nitro-o-xylene in water is 38 days. The estimated percentage of this substance in water is 19% relative to the total amount in the environment. These values indicate that the chemical is not likely to be persistent in water medium.
Executive summary:

The half life period of 4-nitro-o-xylene in water is 38 days. The estimated percentage of this substance in water is 19% relative to the total amount in the environment. These values indicate that the chemical is not likely to be persistent in water medium.