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Characterisation Method Information
Characterisation Method Name:
NOx impact on Base-cat-ion capacity
Date Completed:
Principal Method Name:
EPS: Equivalency method using SO2 as a reference
Method Description:
The characterisation factor is determined by an equivalency method using SO2 as a

When reacting with water and oxygen, 1 kg of NO2 may produce the same amount of protons as 0.5*64/46 = 0.70 kg SO2. When adsorbed by biota reactions may occur where N is reduced again and the net acid production is decreased.

The characterisation factor of SO2 for soil base-cat-ion capacity is determined in Base-cat-ion capacity of EPS for SO2 to 1.56 equivalents of base cat-ions per kg SO2. The characterisation factor of NOx is therefore 0.70*1.56 = 1.09 equivalents of base cations per kg NOx.
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 residence time in air in the order of a week and the residence time in soil is less than a year. The flow group is emissions anywhere on the globe during 1990. The environmental system investigated is therefore chosen to be global during 1990

Existing Characterisation Factors of NOx 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 = *
NOx 1.09 H+ mole equivalence/kg