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Characterisation Method Information
Characterisation Method Name:
HCI impact on base cat-ion capacity
Version:
1999
Date Completed:
1999
Principal Method Name:
EPS: equivalency method using SO2 as a reference
Method Description:
Model

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 chloride will give (64/2)/36 = 0.89
times as much protons as one kg of sulphur dioxide.

Calculation of characterisation factor

For each kg of SO2 there is 1.56 equivalents of base cat-ions reserves depleted. (SO2 impact on base cat-ion capacity)
The characterisation factor of HCl for depletion of soil base cat-ions are therefore
0.89*1.56 = 1.39 equivalents/ kg HCl.
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 system borders are wide enough to contain all of the modelled impact quantity (base cat-ion reserves). The response time for the modelled quantity is normally in the order of days to weeks. The area affected by a local emission is mainly within 1000 km.
Notes:

Existing Characterisation Factors of HCI impact on base cat-ion capacity
Characterisation Parameter Category Indicator Impact Indication Principle Aspect Substance Quantity Unit Notes
CFactor Base cat-ion capacity EPS/2000
Type = Emission
Direction = Output
Media = Air
Geography = *
HCl 1.39 H+ mole equivalence/kg