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Environmental fate & pathways

Distribution modelling

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distribution modelling
Type of information:
calculation (if not (Q)SAR)
Migrated phrase: estimated by calculation
Adequacy of study:
supporting study
2 (reliable with restrictions)

Data source

Materials and methods

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

Results and discussion

Percent distribution in media

Air (%):
Water (%):
Soil (%):
Sediment (%):
Other distribution results:
When the discharge was assumed to be to soil only (at rate 1000 kg/h), 99.8 % of the substance ended up in soil. When the discharge was assumed to be in water only (at rate 1000 kg/h), 99.1 % of the substance ended up in sediment with 0.87 % remaining in water phase.

Applicant's summary and conclusion

Executive summary:

Distribution of NExBTL renewable diesel among different environmental compartments was calculated using EQC Equilibrium Criterion Model 2.02 (by Canadian Environmental Modelling Centre, 2003) assuming equal releases at a constant rate to air, soil and water. The results indicated that > 99 % NExBTL ends up sediments when released in water whereas emissions to soil and air lead to contamination of soil.

Although NExBTL renewable diesel is an UVCB compound, the range and type of alkanes present is relatively constant with C15-C18 isoalkanes tending to predominate.  Regarding NExBTL as a single complex substanceis justified based on the fact that the main components presentare from a single chemical group (alkanes). It is well known that hydrocarbons of similar structure will have similar physicochemical properties and environmental-degradation potentials, and they will also have similar distributions and fates within a given environment.