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Diss Factsheets

Environmental fate & pathways

Distribution modelling

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Administrative data

distribution modelling
Type of information:
calculation (if not (Q)SAR)
Adequacy of study:
key study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method

Data source

Reference Type:
other company data

Materials and methods

calculation according to Mackay, Level III
Calculation programme:
Release year:
2 008
air - biota - sediment(s) - soil - water

Test material

Constituent 1
Chemical structure
Reference substance name:
Isobutyl methacrylate
EC Number:
EC Name:
Isobutyl methacrylate
Cas Number:
Molecular formula:
isobutyl methacrylate

Study design

Test substance input data:
Distributions were calculated with the following factors:
isobutyl methacrylate
molecular weight: 142.2
Henry's LC : 0.000523 atm-m3/mole (Henry database)
Vapor Press : 1.58 mm Hg (user-entered)
Log Kow : 2.95 (user-entered)
Soil Koc : 46.5 (KOCWIN MCI method)

Results and discussion

Percent distribution in media

Other distribution results:
The potential environmental distribution of isobutyl methacrylate obtained from generic level III fugacity model under two emission scenarios is shown in the table.
The results show that if isobutyl methacrylate is released mainly into air, it mainly remains in the air. And if it is released into water, it also mainly remains in the water. i-BMA does not have a significant presence in soil or sediment.
Compartment Amount %
Release to air Release to water
Air 95.8 2.09
Water 3.34 97.5
Soil 0.809 0.0176
Sediment 0.01 0.366

Any other information on results incl. tables

Level III Fugacity Model (Full-Output):


 Chem Name  : 2-Propenoic acid, 2-methyl-, 2-methylpropyl ester

 Molecular Wt: 142.2

 Henry's LC : 0.000523 atm-m3/mole (Henry database)

 Vapor Press : 1.58 mm Hg (user-entered)

 Log Kow    : 2.95 (user-entered)

 Soil Koc   : 46.5 (KOCWIN MCI method)

Release to air: 

 Mass Amount (percent)  Half-Life(hr)  Emissions(kg/hr)
 Air  95.8  9.97  1000
 Water  3.34  360  0
 Soil  0.809  720  0
 Sediment  0.0125  3.24e+003  0



 Fugacity(atm)  Reaction(kg/hr)  Advection(kg/hr)  Reaction(percent)  Advection(percent)
 Air 2.16e-011  873  126  87.3  12.6
 Water  8.04e-012  0.842  0 .437  0.0842  0.0437
 Soil  1.52e-011  0.102  0  0.0102  0
 Sediment  7.13e-012  0.000351  0.0000328  0.0000351  3.28e-06


  Persistence Time: 13.1 hr

  Reaction Time:   15 hr

  Advection Time:  104 hr

  Percent Reacted: 87.4

  Percent Advected: 12.6


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

     Air:     9.971

     Water:   360

     Soil:    720

     Sediment: 3240

     Biowin estimate: 3.025 (weeks      )


  Advection Times (hr):

     Air:     100

     Water:   1000

     Sediment: 5e+004


Release to water: 

 Mass Amount (percent)  Half-Life(hr)  Emissions(kg/hr)
 Air  2.09  9.97  0
 Water  97.5  360  1000
 Soil  0.0176  720  0
 Sediment  0.366  3.24e+003  0



 Fugacity(atm)  Reaction(kg/hr)  Advection(kg/hr)  Reaction(percent)  Advection(percent)
 Air 7.94e-012  321  46.2  32.1  4.62
 Water  3.97e-09  416  216  41.6  21.6
 Soil  5.61e-012  0.0375  0  0.00375  0
 Sediment  3.52e-09  0.173  0.0162  0.0173  0.00162


  Persistence Time: 222 hr

  Reaction Time:   300 hr

  Advection Time:  845 hr

  Percent Reacted: 73.8

  Percent Advected: 26.2


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

     Air:     9.971

     Water:   360

     Soil:    720

     Sediment: 3240

       Biowin estimate: 3.025 (weeks      )


  Advection Times (hr):

     Air:     100

     Water:   1000

     Sediment: 5e+004

Applicant's summary and conclusion

Using a valid modeling approach, if the test substance is released mainly into air, it mainly remains in the air.  And if it is released into water, it also mainly remains in the water.
Executive summary:

Using a valid modeling approach, if the test substance is released mainly into air, it mainly remains in the air. And if it is released into water, it also mainly remains in the water.