Registration Dossier

Administrative data

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

Data source

Reference
Reference Type:
other: Software
Title:
EQC Model Version 2.02
Author:
The Canadian Centre for Environmental Modelling and Chemistry
Bibliographic source:
EQC Model Version 2.02, The Canadian Centre for Environmental Modelling and Chemistry, May 2003. http://www.trentu.ca/academic/aminss/envmodel/models/EQC2.html
Report Date:
2012

Materials and methods

Model:
calculation according to Mackay, Level III
Calculation programme:
EQC Model Version 2.02
Release year:
2 003
Media:
other: soil - air - sediment -water

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
other: gas
Details on test material:
Test materials: the model is applied to the pure substance.

Study design

Test substance input data:
- Molar mass: 166 g/mol
- Data temperature: 20°C
- Water solubility: 31.5 g/m3
- Vapour pressure: 50550 Pa
- log Pow: 1.42
- Melting point: -155

- Reaction half-life estimates for
- Air: 87 h
- Water: negligible
- Soil: negligible
- Sediment: negligible

Results and discussion

Percent distribution in media

Air (%):
100
Water (%):
0
Soil (%):
0.004
Sediment (%):
0

Any other information on results incl. tables

The EQC Fugacity III Model clearly shows that all the PMVE released to atmosphere remains in this compartment. The rates of transfer to soil and water are reduced and only negligible amounts of the total emission remain in these media and in sediments. Most of the very reduced amount of PMVE that partitions into water then tends to comes back into air because of intermedia exchange and the rest is removed by advection. PMVE is a volatile gas at ambient conditions with a slight water solubility, so it is not expected to partition in water.

Applicant's summary and conclusion

Conclusions:
PMVE released to atmosphere remains in this compartment. The rates of transfer to soil and water are reduced and only negligible amounts of the total emission remain in these media and in sediments. Most of the very reduced amount of PMVE that partitions into water then tends to comes back into air because of intermedia exchange and the rest is removed by advection.
Executive summary:

In order to understand the environmental fate of perfluoromethylvinylether (PMVE) the EQC Fugacity III Model has been applied (Version 2.02, The Canadian Centre for Environmental Modelling and Chemistry, May 2003). The EQuilibrium Criterion or EQC model is based on an evaluative multimedia model described by Mackay et al1. The EQC model uses chemical-physical properties to quantify a chemical's behaviour in an evaluative environment. Three degrees of complexity are treated in the EQC: particularly, levels I and II assume thermodynamic equilibrium is achieved; level II also includes advective and reaction processes. Level III is a non-equilibrium, steady-state assessment of chemical fate in the environment.

The results of Level III model, which describes a situation more complex and realistic than previous models, are here presented.

The physico-chemical properties requested by this model are the following:

- water solubility: 31,5 mg/l2

- vapour pressure: 5055 hPa at 20°C3

- log Kow : 1.424

- melting point : -155.15°C5

As input parameter a reaction half life of about 87 hours (0.010 years) in air has been entered, too.

Since in case of accidental emission PMVE is expected to be released only in air, an emission rate of 1000 kg/h has been assumed in this compartment.

The EQC Fugacity III Model clearly shows that all the PMVE released to atmosphere remains in this compartment. The rates of transfer to soil and water are reduced and only negligible amounts of the total emission remain in these media and in sediments. Most of the very reduced amount of PMVE that partitions into water then tends to comes back into air because of intermedia exchange and the rest is removed by advection.