• Analyses must be
carried out for more than just
the target analyte if compounding
effects are
anticipated.
eg1. SO2 / PM10 dust synergism
worse than the sum of the components
eg2. NH3 / H+ antagonism
NH3 is toxic to fish, not NH4+ ie. f(pH)
Monitoring
has various scales :
a) widespread is used at the start.
b) the
critical path where progressively
higher
concentrations are found.
c) the
critical group with the highest risk.