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Characterisation Method Information
Characterisation Method Name:
Propylene impact on severe morbidity
Version:
1999
Date Completed:
1999
Principal Method Name:
EPS: cancer pathway, global warming and oxidant pathways
Method Description:
Model 1, cancer pathway

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

Equivalency factor

The equivalency factor was determined in "Propylene impact on YOLL" to 0.074.

Calculation of pathway specific characterisation factor

The cancer pathway specific characterisation factor of benzene for severe morbidity was
determined to 2.28E-06 person-years per kg. Thus the cancer pathway specific
characterisation factor of propylene for severe morbidity is 0.074 *2.28E-06 = 1.69E-07 person-years per kg propylene.

Model 2, global warming pathway

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

Equivalency factor

The GWP100 (global warming potential over 100 years) 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statement was withdrawn by IPCC, with the motivation that the uncertainty was too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 severe morbidity is determined to 3.53E-07 person-years/kg, which means that the characterisation factor of propylene for severe morbidity is 11*3.53E–07 = 3.88E–06 person-years/kg.


Model 3, 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 propylene is 0.734 (Lindfors et al.,1994)

Calculation of pathway specific characterisation factor

The oxidant pathway specific characterisation factor of ethylene for severe morbidity is determined to 6.76E-07 person-years/kg ethylene. This gives an oxidant pathway specific characterisation factor of propylene for severe morbidity of 0.734*6.76E-07 = 4.98E-07 person-years/kg.

Calculation of characterisation factor

The resulting characterisation factor from adding the three pathways is 1.69E-07 +
3.88E–06 + 4.98E-07 = 4.05E-06 person-years/kg

Literature Reference:
1. Lindfors, L.G.,Christiansen, K., Hoffman, L., Virtanen, Y., Juntilla, V. Leskinen, A., Hanssen, O-J., Rønning, A., Ekvall, T. and Finnveden, G., LCA-Nordic, Technical report No 10, Tema Nord 1995:503, Nordic Council of Ministers, Copenhagen 1994. 2. Houghton, J.T Jenkins, G.J. and Ephraums, J.J., (Ed.) (1990) Climate change – The IPCC scientific assessment. Cambridge University Press
Methodological Range:
Including emissions from anywhere at the globe 1990 and considering a residence time of several days for propylene and its reaction products, the environmental system will also be global. As propylene causes cancer, there is a reason for using a 20-year system border, but as we use a linear dose-response model, we restrict the system borders to the year 1990. For the global warming pathways the same system borders as for CO2 is relevant, i.e. 100 years.
Notes:

Existing Characterisation Factors of Propylene impact on severe morbidity
Characterisation Parameter Category Indicator Impact Indication Principle Aspect Substance Quantity Unit Notes
CFactor Severe morbidity EPS/2000
Type = Emission
Direction = Output
Media = Air
Geography = *
Propylene 4.05E-06 p yr/kg 3 pathways