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Characterisation Method Information
Characterisation Method Name:
NH3 impact on wood
Version:
1999
Date Completed:
1999
Principal Method Name:
EPS: secondary aerosol pathway and nutrification pathway
Method Description:
Model 1, secondary aerosol pathway

The characterisation factor is determined by an equivalency method using PM10 as a reference.

Equivalency factor

The same equivalency factor is used as in "NH3 impact on severe morbidity", i.e. 2.00 kg ‘effective’ PM10/kg NH3.

Calculation of pathway specific characterisation factor

According to "PM10 impact on wood" there are 0.00991 kg wood per kg PM10. This will give 2.00*0.00991 = 0.0198 kg wood per kg NH3.

Model 2, nutrification pathway

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

Equivalency factor

Ammonia is carrying more nitrogen per weight unit than NOx, and one kg NH3 is equal to 46/17 = 2.71 kg NOx in that respect.

Calculation of pathway specific characterisation factor

The nutrification pathway specific characterisation factor of NOx for wood was determined in "NOx impact on wood" to -2.74 kg wood/kg NOx. The characterisation factor for NH3 is therefore 2.71*(-2.74) = -7.42 kg wood/kg NH3.

Calculation of characterisation factor

0.0198 – 7.42 = -7.40 kg wood/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.
Notes:

Existing Characterisation Factors of NH3 impact on wood
Characterisation Parameter Category Indicator Impact Indication Principle Aspect Substance Quantity Unit Notes
CFactor Wood EPS/2000
Type = Emission
Direction = Output
Media = Air
Geography = *
NH3 -7.40 kg/kg 2 pathways