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Characterisation Method Information
Characterisation Method Name:
NH3 impact on base cat-ion capacity
Date Completed:
Principal Method Name:
EPS: equivalency method using SOx as a reference
Method Description:

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

Equivalency factor

The equivalency factor was determined in "NH3 impact on fish&meat" to 0.94.

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 NH3 for depletion of soil base cat-ions are therefore
0.94*1.56 = 1.47 equivalents/ kg NH3.
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.

Existing Characterisation Factors of NH3 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 = *
NH3 1.47 H+ mole equivalence/kg