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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Administrative data

Endpoint:
biodegradation in water and sediment: simulation tests
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 and sediment 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:
other: Modelling database
Principles of method if other than guideline:
Fugacity Model by EPI Suite estimation database
GLP compliance:
no

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
Inoculum or test system:
not specified
Parameter followed for biodegradation estimation:
test mat. analysis
Reference substance
Reference substance:
not specified

Results and discussion

Mean total recoveryopen allclose all
Compartment:
other: water, material (mass) balance
% Recovery:
23.4
Compartment:
other: sediment, material (mass) balance
% Recovery:
1.07
% Degradationopen allclose all
% Degr.:
50
Parameter:
other: Half life
Sampling time:
15 d
Remarks on result:
other: 50% degradation found in water
% Degr.:
50
Parameter:
other: Half life
Sampling time:
135 d
Remarks on result:
other: 50% degradation found in sediment
Half-life of parent compound / 50% disappearance time (DT50)open allclose all
Compartment:
water
DT50:
15 d
Type:
other: estimated
Remarks on result:
other: 360 h = 15 d
Compartment:
sediment
DT50:
135 d
Type:
other: estimated
Remarks on result:
other: 3240 h = 135 d
Transformation products:
not specified
Evaporation of parent compound:
not specified
Volatile metabolites:
not specified
Residues:
not specified

Applicant's summary and conclusion

Conclusions:
According to EPI (Estimation Programs Interface) Suite , estimated half-life for triethyl phosphite in water is 15 days which shows fast degradation whereas half life for sediment is 135 d shows slow degradation.
Executive summary:

 

 

Mass Amount (percent)

Half-Life (hr)

Emissions (kg/hr)

Water

23.4

360

1000

Sediment

1.07

3.24e+003

0

 

 

Fugacity (atm)

Reaction (kg/hr)

Advection (kg/hr)

Reaction (percent)

Advection (percent)

Water

2.41e-010

614

319

20.5

10.6

Sediment

1.66e-010

3.11

0.291

0.104

0.0097

 

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