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Characterisation Method Information
Characterisation Method Name:
Butadiene impact on NEX
Version:
1999
Date Completed:
1999
Principal Method Name:
EPS: Global warming pathway
Method Description:
NEX is Normalised EXtinction of species.


Model

The characterisation factor is determined by an equivalency method using CO2 as a reference.

Equivalency factor

The GWP100 was estimated by IPCC to 11 in one of the early reports. (1990). Later this
statement was withdrawn by IPCC, with the motivation that the uncertainty was too
large. In the EPS context however, omitting it would create a larger error than including
it, so the equivalency factor 11 will still be used.

Calculation of characterisation factor

The characterisation factor of CO2 for NEX is 1.26E14 per kg CO2 . Thus the characterisation factor of NEX is 11*(1.26E14 ) = 1.39E13 NEX per kg butadiene.
Literature Reference:
Steen B (1999b): A systematic approach to environmental priority strategies in product development (EPS). Version 2000 Models and data of the default method CPM report Chalmers University of Technology Sweden
Methodological Range:
The pathway modelled is via global warming. The same system borders as for CO2 is used i.e 100 years.
Notes:

Existing Characterisation Factors of Butadiene impact on NEX
Characterisation Parameter Category Indicator Impact Indication Principle Aspect Substance Quantity Unit Notes
CFactor NEX EPS/2000
Type = Emission
Direction = Output
Media = Air
Geography = *
Butadiene 1.39E-13 NEX/kg Global warming pathway