Page 313 - Materials Chemistry, Second Edition

4.6 Illustration of the Phase Impact Assessment by Practical Example 297

For the eutrophication of soil (S) the following applies:
NP = ∑ (m × NP )
S i i
i
For the eutrophication of water (W) the following applies:
NP = ∑ (m × NP )
i
i
W
i
4.6.1.4 Acidification Potential
Acidification because of acid-forming substances can occur in both terrestrial
and aquatic systems.
An impact indicator AP as described 376) is regarded as adequate. Therefore,
no specific properties of the loaded land and water systems are required.
The calculation of the AP is usually done in units of SO equivalents.
2
Pollutants considered in this study are listed with their AP as SO equivalent
2
in Table 4.20.
Table 4.20 Acidification potential of the substances in the context of this project.

Pollutant SO -equivalents (AP )
2 i
Sulphur dioxide (SO ) 1
2
Hydrogen sulphide (H S) 1.88
2
Sulphuric acid 0.65
Hydrogen chloride (HCl) 0.88
Hydrogen fluoride (HF) 1.6
Hydrogen cyanide 1.6 a
Nitrogen oxides (NO ) 0.7
x
TRS (total reduced sulphur) calculated as S 2.0
Carbon disulphide 1.68
Ethane thiol 1.03
Mercaptan 0.84 b
Ammonia 1.88

a Assumption like HF.
b Assumption: Propanthiol.

Guin´ ee et al. (2002) and Kl̈ opffer (1995).

The contribution to the AP is calculated as the sum of the products of AP
and released quantities of individual pollutants according to the following
formula:
AP = ∑ (m × AP )
i i
i
376) CML (1992) and Kl¨ opffer (1995).