|Characterisation Method Name:|
|Butadiene impact on wood|
|Principal Method Name:|
|EPS: global warming and fertilisation pathways|
The characterisation factor is determined by an equivalency method using CO2 as a reference. There are two pathways for CO2’s impact on forest growth. One is the global warming and the other is CO2 fertilisation. The CO2 fertilisation is more than 30 times as efficient as the global warming. Considering the GWP100 for butadiene being 11 and the equivalency for CO2 fertilisation being 46*4/54 = 3.41, the CO2 fertilisation pathway is still 10 times as efficient. Therefore the model will focus on the equivalency with CO2 in the fertilising aspect.
The equivalency for CO2 fertilisation was calculated above to 46*4/54 = 3.41. 46*4 is the molecular weight of 4 CO2 and 54 the molecular weight of butadiene. (Each butadiene molecule will give 4 CO2 molecules when it is oxidised). It is assumed that all butadiene is oxidised sooner or later to CO2 and water.
Calculation of characterisation factor
As the fertilisation pathway specific characterisation factor of CO2 for wood is –3.93E-02 kg wood/kg CO2 we obtain the pathway specific characterisation factor of butadiene for wood to 3.41*(-3.93E-02 ) = -1.34E-01 kg wood/kg.
|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|
|The pathway modelled is via global warming. The same system borders as for CO2 is used i.e 100 years.|
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