32
2. Interpreting Selenium Concentrations
for assessing the degree of contamination, the relative toxic threat to
aquatic life, and the extent to which aquatic ecosystems have recovered following management actions to reduce selenium inputs. Importantly, these measures provide the data needed for the second step:
comprehensive hazard assessment using procedures that integrate all
5 ecosystem components (see Chapter 4). The overall selenium status
and health of aquatic ecosystems can be determined by combining
these two steps.
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