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Characterisation Method Information
Characterisation Method Name:
COD impact on NEX
Version:
1999
Date Completed:
1999
Principal Method Name:
EPS: equivalency method using N-tot as a reference
Method Description:
NEX is Normalised EXtinction of species.

Model

The characterisation factor is determined by an equivalency method using N-tot as a
reference.

Equivalency factor

According to Lindfors et al. (1995), each mole of nitrogen corresponds to 8.6 mole of
consumed oxygen in a N-limited aquatic system scenario. Normally, only a part of the
COD is actually mineralised in such a way as it contributes to oxygen-free water. This
part is assumed to be 50%. The equivalency factor is therefore equal to = 0.5*14/(8.6*16) = 0.0508 kg/kg

Calculation of characterisation factor

The characterisation factor for N-tot is determined in "N-tot impact on NEX" to 1.8×E-13 . The characterisation factor for COD is thus 0.0508*1.8E-13 = 9.18E-15 NEX/kg BOD.

Literature Reference:
Lindfors, L.G.,Christiansen, K., Hoffman, L., Virtanen, Y., Juntilla, V. Leskinen, A., Hanssen, O-J., Rønning, A., Ekvall, T. and Finnveden, G., LCA-Nordic, Technical report No 10, Tema Nord 1995:503, Nordic Council of Ministers, Copenhagen 1994.
Methodological Range:
All lakes, surface waters and oceans on the globe 1990.
Notes:

Existing Characterisation Factors of COD impact on NEX
Characterisation Parameter Category Indicator Impact Indication Principle Aspect Substance Quantity Unit Notes
CFactor NEX EPS/2000
Type = Emission
Direction = Output
Media = Water
Geography = *
COD 9.18E-15 NEX/kg