Registration Dossier

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 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
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

Materials and methods

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

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report): triethyl phosphite
- Substance type: Organic
- Physical state: liquid
Radiolabelling:
not specified

Study design

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

Results and discussion

% Degradation
Soil No.:
#1
% Degr.:
50
Parameter:
other: Half life
Sampling time:
30 d
Half-life / dissipation time of parent compound
Soil No.:
#1
DT50:
30 d
Type:
other: estimated data
Remarks on result:
other: other details not available
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 has estimated that triethyl phosphite 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, 30 days, does not exceed the EPA criteria . Therefore, triethyl phosphite is estimated not to be persistent in the environment.
Executive summary:

Fugacity Model by EPI Suite estimation database

 

 

Mass Amount (percent)

Half-Life (hr)

Emissions (kg/hr)

Soil

75.1

720

1000

 

 

Fugacity (atm)

Reaction (kg/hr)

Advection (kg/hr)

Reaction (percent)

Advection (percent)

Soil

2.66e-010

988

0

32.9

0

 

Persistence Time: 456 hr

Reaction Time: 522 hr

Advection Time: 3.56e+003 hr

Percent Reacted: 87.2

Percent Advected: 12.8

 

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

Air: 4.43

Water: 360

Soil: 720

Sediment: 3240

Biowin estimate: 2.832 (weeks )

 

Advection Times (hr):

Air: 100

Water: 1000

Sediment: 5e+004

PBT Profiler Estimate

Media

Half-Life 
(days)

Percent in
Each Medium

Soil

30

  52%