Registration Dossier

Administrative data

Endpoint:
distribution modelling
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Based on an acceptable computer model. Accepted calculation method.

Data source

Reference
Reference Type:
other: Company data
Title:
Unnamed
Year:
2012

Materials and methods

Model:
calculation according to Mackay, Level III
Calculation programme:
A Mackay level III distribution was calculated using the EPI Suite ver. 4.10 (US-EPA, 2011)
Release year:
2 011
Media:
air - biota - sediment(s) - soil - water

Test material

Reference
Name:
Unnamed
Type:
Constituent

Study design

Test substance input data:
Distributions were calculated with the following factors:

Level III Fugacity Model (Full-Output):
=======================================

EPIWIN inputs:
Chem Name : 2-Propenoic acid, 2-methyl-, anhydride
Molecular Wt: 154.17
Henry's LC : 2.44e-005 atm-m3/mole (Henrywin program)
Vapor Press : 0.678 mm Hg (user-entered)
Log Kow : 1.23 (Kowwin program)
Soil Koc : 10 (KOCWIN MCI method)

Results and discussion

Percent distribution in media

Other distribution results:
The potential environmental distribution of methacrylic anhydride obtained from generic level III fugacity model shows that if released to air, methacrylic anhydride preferentially stays in air and partitions to a lesser degree to water and soil. Partitioning to sediment is very low. When released to water all methacrylic anhydride tends to stay in the compartment where it was released.
The chemical is a chemical intermediate - emissions to soil are not expected.

Any other information on results incl. tables

Level III Fugacity Model (Full-Output):

=======================================

 Chem Name  : 2-Propenoic acid, 2-methyl-, anhydride

 Molecular Wt: 154.17

 Henry's LC : 2.44e-005 atm-m3/mole (Henrywin program)

 Vapor Press : 0.678 mm Hg (user-entered)

 Log Kow    : 1.23 (Kowwin program)

 Soil Koc   : 10 (KOCWIN MCI method)

 

 

Mass Amount (percent)

Half-Life (hr)

Emissions

(kg/hr)

 

 

 

 

Air

81.5

   5.65

1000

Water

12.8

 360

  0

Soil

 5.61

 720

  0

Sediment

 0.0289

3240

  0

 

            Fugacity   Reaction   Advection  Reaction   Advection

             (atm)     (kg/hr)     (kg/hr)   (percent)  (percent)

  Air      1.19e-011   921        75.1       92.1       7.51     

  Water    9.36e-013   2.28       1.18       0.228      0.118    

  Soil     8.41e-012   0.497      0          0.0497     0        

  Sediment 8.5e-013    0.00057    5.33e-005  5.7e-005   5.33e-006

 

  Persistence Time: 9.22 hr

  Reaction Time:   9.98 hr

  Advection Time:  121 hr

  Percent Reacted: 92.4

  Percent Advected: 7.63

 

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

     Air:     5.654

     Water:   360

     Soil:    720

     Sediment: 3240

       Biowin estimate: 2.858 (weeks      )

 

  Advection Times (hr):

     Air:     100

     Water:   1000

     Sediment: 5e+004

 

 

Level III Fugacity Model (Full-Output):

=======================================

 Chem Name  : 2-Propenoic acid, 2-methyl-, anhydride

 Molecular Wt: 154.17

 Henry's LC : 2.44e-005 atm-m3/mole (Henrywin program)

 Vapor Press : 0.678 mm Hg (user-entered)

 Log Kow    : 1.23 (Kowwin program)

 Soil Koc   : 10 (KOCWIN MCI method)

 

 

Mass Amount (percent)

Half-Life (hr)

Emissions

(kg/hr)

 

 

 

 

Air

 0.17

   5.65

  0

Water

 99.6

 360

1000

Soil

 0.0117

 720

  0

Sediment

 0.224

3240

  0

 

 

            Fugacity   Reaction   Advection  Reaction   Advection

             (atm)     (kg/hr)     (kg/hr)   (percent)  (percent)

  Air      8.57e-013   66.3       5.41       6.63       0.541    

  Water    2.51e-010   611        317        61.1       31.7     

  Soil     6.06e-013   0.0358     0          0.00358    0        

  Sediment 2.28e-010   0.153      0.0143     0.0153     0.00143  

 

  Persistence Time: 319 hr

  Reaction Time:   470 hr

  Advection Time:  987 hr

  Percent Reacted: 67.7

  Percent Advected: 32.3

 

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

     Air:     5.654

     Water:   360

     Soil:    720

     Sediment: 3240

       Biowin estimate: 2.858 (weeks      )

 

  Advection Times (hr):

     Air:     100

     Water:   1000

     Sediment: 5e+004

Applicant's summary and conclusion

Conclusions:
Using a valid Fugacity modeling method (Mackay Level III) the potential environmental distribution of methacrylic anhydride was calculated. If methacrylic anhydride is released to air, it preferentially stays in air and partitions to a lesser degree to water and soil. Partitioning to sediment is very low. When released to water all methacrylic anhydride tends to stay in the compartment where it was released.
The chemical is a chemical intermediate - emissions to soil are not expected.
Executive summary:

Using a valid Fugacity modeling method (Mackay Level III, Epiwin 4.1) the potential environmental distribution of methacrylic anhydride was calculated. If methacrylic anhydride is released to air, it preferentially stays in air and partitions to a lesser degree to water (12,8%) and soil (5.6 %). Partitioning to sediment is very low. When released to water all methacrylic anhydride tends to stay in the compartment where it was released. The chemical is a chemical intermediate - emissions to soil are not expected.