Page 260 - Materials Chemistry, Second Edition

L1644_C06.fm Page 233 Monday, October 20, 2003 12:06 PM

3. Life-cycle impact assessment methods
impact scores

4. Dominance analysis and spatial differentiation

(for selected impact score)
Dominance analysis for media

assign all environmental loads
for each impact score
to its medium

also qualitative
graphical representation
arguments can be used

decision
which media, emitted to, will be
considered for further assessment?

(predominant media)

Dominance analysis for
process and pollutant

Spatial differentiation
(as far as information is available assign
sites and regions to processes and pollutants)

potentials by
eco-technology matrix
accidents
FIGURE 6.12 Dominance analysis for media and spatial differentiation.

In the dominance analysis for media (i.e., air, water and soil), all emissions
considered in the selected impact score are assigned to their media. Then the
contribution of each medium to the total impact score is presented graphically.
Finally, a decision must be made about which of the media emitted to will be
considered for further assessment. In this decision qualitative arguments can also be
used.
The dominance analysis for processes and pollutants is applied to the predom-
inant media and is structured in a similar way for processes and environmental loads
(Figure 6.13). First, the percentage of the total of the selected impact score is

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