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Characterisation Method Information
Characterisation Method Name:
H2S impact on NEX
Date Completed:
Principal Method Name:
EPS: equivalency method using SO2 as a reference
Method Description:
NEX is Normalised EXtinction of species.


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

Equivalency factor

It is assumed that almost all hydrogen sulphide is oxidised to SO2 in the atmosphere. Therefore 1 kg of H2S is equal to 1.49 kg SO2.

Calculation of characterisation factor

The characterisation factor for SO2 was estimated in "SO2 impact on NEX" to -2.94E-13 NEX per kg SO2. The characterisation factor for H2S is therefore 1.49*(-2.94E-13 ) = -4.38E-13 NEX per kg SO2 per kg H2S.
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.

Existing Characterisation Factors of H2S 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 = *
H2S -4.38E-13 NEX/kg