Registration Dossier

Administrative data

Endpoint:
distribution modelling
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
other information
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: accepted calculation method

Data source

Reference
Reference Type:
other company data
Title:
Unnamed
Year:
2009
Report Date:
2009

Materials and methods

Model:
calculation according to Mackay, Level III
Calculation programme:
US EPA EPI SUITE v4.00
Release year:
2 009
Media:
other: air-water-soil-sediment

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report): Propanoic acid, 2-methyl-

Study design

Test substance input data:
- Molar mass: 88.11
- Vapour pressure: 3.27 mm Hg
- log Pow: 0.94
- Mineral matter - water partition coefficient: Soil Koc: 2.25
- Reaction half-life estimates for
- Air: 192.5 hr
- Water: 208.1 hr
- Soil: 416.2 hr
- Sediment: 1873 hr
- Suspended sediment: -
- Aerosols: -
- Aquatic biota: -

Results and discussion

Percent distribution in media

Air (%):
7.39
Water (%):
37.5
Soil (%):
55
Sediment (%):
0.07

Any other information on results incl. tables

Level III Fugacity Model:

Mass Amount

(percent)

Half-Life

(hr)

Emissions

(kg/hr)

Air

7.39

192.3

1000

Water

37.5

208.1

1000

Soil

55

416.2

1000

Sediment

0.0681

1873

0

Persistence Time: 282 hr

Applicant's summary and conclusion

Conclusions:
Emissions of isobutyric acid will distribute prevalently in soil (55%) and to a slightly lesser extend in water (37.5%). The portion in air is considerably less (7.39%) with a minimal fraction in sediment (0.0681%).
The estimated persistance time is 282 hr.
Executive summary:

Estimates obtained from Level III fugacity distribution modelling using US EPA EPI Suite v4.00, model component Level III fugacity model, indicate that emissions of isobutyric acid will distribute predominantly in soil (55%) and water (37.5%), and to a considerably lesser extent in air (7.39%). The fraction in sediment is minimal (0.068%). The estimated persistance time is 282 hr (ECT, 2009).