| Characterisation Method Name: |
| NOx impact on Base-cat-ion capacity |
| Version: |
| 1999 |
| Date Completed: |
| 1999 |
| 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 reference. 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 |
| Notes: |
| Characterisation Parameter | Category Indicator | Impact Indication Principle | Aspect | Substance | Quantity | Unit | Notes | ||||||||
| CFactor | Base cat-ion capacity | EPS/2000 |
|
NOx | 1.09 | H+ mole equivalence/kg |