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Characterisation Method Information
Characterisation Method Name:
HF impact on NEX
Version:
1999
Date Completed:
1999
Principal Method Name:
EPS: acidification pathway and aerosol transformation pathway
Method Description:
NEX is Normalised EXtinction of species.

Model 1, acidification pathway

The characterisation factor is determined by an equivalency method using SO2 as a reference.

Equivalency factor

Due to its lower molecular weight 1 kg of hydrogen fluoride will give (64/2)/20 = 1.6
times as much protons as one kg of sulphur dioxide.

Calculation of pathway specific characterisation factor

The acidification pathway specific characterisation factor of SO2 for NEX is 1.18E-14 per kg SO2. The characterisation factor of HF for NEX will thus be 1.6 * 1.18E-14 = 1.89E-14 per kg HF.

Model 2, aerosol transformation pathway

The characterisation factor is determined by an equivalency method using PM10 as a reference.

Equivalency factor

The same equivalency factor is used as in "HF impact on severe morbidity", i.e. 1.8 kg ‘effective’ PM10/kg HF.

Calculation of pathway specific characterisation factor

The characterisation factor of PM10 for NEX is -1.08E-13 per kg PM10. The characterisation factor of HF for NEX will thus be 1.80*(-1.08E-13 ) = -1.94E-13 per kg
HF.

Calculation of characterisation factor

The added characterisation factor of HF for NEX considering both pathways is thus
1.92E10 + 1.08E-13 = 1.92E-10 per kg HF.
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 system is global and the time period is 1990. The spatial system borders are wide enough to contain all of the modelled impact quantity (NEX on a global or local level). The response time for the modelled quantity is normally in the order of several years to decades, depending on the reproduction cycles of the NEX and on the volumes and alkalinity of the inland waters at risk for acidification. This means that present observed impacts are mainly caused by emissions several years ago. Despite this the characterisation factor of HF for NEX will be modelled as if everything happened within 1990. The magnitude of the error, which may be introduced through this, is discussed and estimated later.
Notes:

Existing Characterisation Factors of HF 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 = *
HF 1.92E-10 NEX/kg 2 pathways