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Characterisation Method Information
Characterisation Method Name:
Butadiene impact on crop
Version:
1999
Date Completed:
1999
Principal Method Name:
EPS: oxidant and global warming pathways
Method Description:
Model 1, oxidant pathway

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

Equivalency factor

The POCP (Photo Oxidant Creation Potential) for butadiene is not listed in Lindfors et.al. (1994), but extrapolating from n-butane, with a peak POCP of 0.554 and 1-butene with 0.799 it is likely that 1,3-butadiene has a POCP around 1.

Calculation of characterisation factor

The oxidant pathway specific characterisation factor of ethylene for crop loss is determined to 4.86 kg crop/kg ethylene. This gives an oxidant pathway specific characterisation factor of butadiene for crop of 1*4.86 = 4.86 kg crop/kg butadiene.

Model 2, global warming pathway

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

Equivalency factor

The GWP100 was estimated by IPCC (Intergovernmental Panel on Climate Change)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 Later this statement was withdrawn by IPCC, with the motivation that the uncertainty was too large.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 pathway specific characterisation factor

The characterisation factor of CO2 for crop loss is 7.56E04 kg crop/kg CO2. Thus the
characterisation factor of butadiene for crop loss is 11*7.56E04 = 8.32E03 kg crop/kg butadiene.

Calculation of characterisation factor

The total characterisation factor for both pathways is thus 4.86 + 8.32E03 = 4.87 kg crop/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 ozone level in rural areas has increased significantly since pre-industrial time. The reaction velocity for butadiene to form oxidants is normally in the order of days, but in the dark periods in the arctic regions the residence time of butadiene can be much longer. However a time system border of one year is believed to be sufficient for impact modelling. The system borders used for the oxidant model are thus global and the year 1990. For the global warming pathway the same system borders as for CO2 apply, i.e. 100 years.
Notes:

Existing Characterisation Factors of Butadiene impact on crop
Characterisation Parameter Category Indicator Impact Indication Principle Aspect Substance Quantity Unit Notes
CFactor Crop EPS/2000
Type = Emission
Direction = Output
Media = Air
Geography = *
Butadiene 4.78 kg/kg