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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Administrative data

Endpoint:
biodegradation in soil
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

Referenceopen allclose all

Reference Type:
other: Prediction model
Title:
Biodegradation in soil 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
Reference Type:
other: Prediction model
Title:
Biodegradation in soil by EPI (Estimation Programs Interface) Suite
Author:
Sustainability Support Service (Europe) AB - estimated
Year:
2011
Bibliographic source:
Estimation Programs Interface Suite™ United States Environmental Protection Agency, Washington, DC, USA. version 4.1

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other: Modelling database
Principles of method if other than guideline:
PBT profiler database
Fugacity Model by EPI Suite estimation database
GLP compliance:
no
Test type:
other: estimated data

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
Radiolabelling:
not specified

Study design

Oxygen conditions:
other: estimated data
Soil classification:
not specified
Duration of test (contact time)
Soil No.:
#1
Duration:
75 d
Parameter followed for biodegradation estimation:
test mat. analysis

Results and discussion

% Degradation
Soil No.:
#1
% Degr.:
50
Parameter:
other: half-life
Sampling time:
75 d
Half-life / dissipation time of parent compound
Soil No.:
#1
DT50:
75 d
Type:
other: Estimated
Remarks on result:
other: 75 d = 1800 hr
Transformation products:
not specified
Evaporation of parent compound:
not specified
Volatile metabolites:
not specified
Residues:
not specified

Applicant's summary and conclusion

Conclusions:
The PBT Profiler & EPI Suite has estimated that 4-nitro-o-xylene is expected to be found predominantly in soil and its persistence estimate is based on its transformation in this medium. Its half-life in soil, 75 days., exceeds the EPA criteria .Therefore, 4-nitro-o-xylene is estimated to be persistent in the soil environment.
Executive summary:

The PBT Profiler & EPI Suite has estimated that 4-nitro-o-xylene is expected to be found predominantly in soil and its persistence estimate is based on its transformation in this medium. Its half-life in soil, 75 days., exceeds the EPA criteria .Therefore, 4-nitro-o-xylene is estimated to be persistent in the soil environment.

PBT Profiler Estimate

Media

Half-Life (days)

Percent in
Medium

Soil

75

   78%

Fugacity Model by EPI Suite estimation database

 

Mass Amount (percent)

Half-Life (hr)

Emissions (kg/hr)

Soil

80

1.8e+003

1000

 

Fugacity (atm)

Reaction (kg/hr)

Advection (kg/hr)

Reaction (percent)

Advection (percent)

Soil

3.09e-009

922

0

30.7

0

Persistence Time: 999 hr

Reaction Time: 1.91e+003 hr

Advection Time: 2.09e+003 hr

Percent Reacted: 52.3

Percent Advected: 47.7

 

Half-Lives (hr), (based upon Biowin (Ultimate) and Aopwin):

Air: 244.1

Water: 900

Soil: 1800

Sediment: 8100

Biowin estimate: 2.546 (weeks-months)

 

Advection Times (hr):

Air: 100

Water: 1000

Sediment: 5e+004