Page 365 - Materials Chemistry, Second Edition

348 Part 2b: Operational annex

4.3.11 Eutrophication

Table 4.3.11.1 : Generic EP factors for characterising eutrophying releases to air, water and soil.
Substance CAS number EP (in kg
ammonia 7664–41–7 0.35
ammonium 14798–03–9 0.33
nitrate 14797–55–8 0.1
nitric acid 7697–37–2 0.1
nitrogen 7727–37–9 0.42
nitrogen dioxide 10102–44–0 0.13
nitrogen monoxide 10102–43–9 0.2
nitrogen oxides 10102–44–0 0.13
phosphate 7664–38–2 1
phosphoric acid 7664–38–2 0.97
phosphorus (P) 7723–14–0 3.06
phosphorus(V) oxide 1314–56–3 1.34
chemical oxygen demand (COD) 1 - 0.022

Source: Heijungs et al., 1992 with some modifications
Status: authors
Equation:
The indicator result is expressed in kg equivalent. is the Eutrophication
Potential for substance i emitted to air, water or soil, while is the emission of
substance i to air, water or soil.
2
Remark: If the Biological Oxygen Demand (BOD) is specified it can generally be converted to a
COD. The conversion factor will depend on the situation.

1
The amount of oxygen required to oxidize the organic compounds in a water sample to carbon dioxide and water;
it is measured utilizing a strong chemical oxidant.
2
The amount of oxygen used by micro-organisms in the biochemical oxidation of organic matter.