Page 358 - Materials Chemistry, Second Edition

344 Part 2b: Operational annex

4.3.10 Acidification

Table 4.3.10.1: Average European AP factors for characterising acidifying releases to the air.
Substance Compartment CAS number AP in kg eq. in Switzerland /kg
ammonia air 7664–41–7 1.6
nitrogenoxides(as air 10102–44–0 0.5
sulphur dioxide air 7446–09–5 1.2

Source: Huijbregts, 1999a
Status: Author
Equation:

The indicator result is expressed in kg emitted in Switzerland equivalent. is the
Acidification Potential for substance i emitted to the air, while is the emission of
substance i to the air.

Table 4.3.10.2: Alternative generic AP factors for characterising acidifying releases to the air.
Substance CAS number AP (in kg eq./kg)
ammonia 7664–41–7 1.88
hydrogen chloride 7664–01–0 0.88
hydrogen fluoride 7664–39–3 1.60
hydrogen sulfide 7783–06–4 1.88
nitric acid 7697–37–2 0.51
nitrogen dioxide 10102–44–0 0.70
nitrogen monoxide 10102–43–9 1.07
nitrogen oxides 10102–44–0 0.70
phosphoric acid 7664–38–2 0.98
sulfur dioxide 7446–09–5 1.00
sulfur trioxide 7446–11–9 0.80
sulphuric acid 7664–93–9 0.65

Source: Heijungs et al., 1992 (updated with Hauschild & Wenzel, 1998)
Status: authors
Equation:

The indicator result is expressed in kg -equivalents. is the Acidification Potential
for substance i emitted to the air; while is the emission of substance i to the air.