Figure 9.7
(a)
(b)
Cascade impactor: (a) schematic diagram, showing trajectories of particles of three
different diameters (adapted from Willeke and Baron, 1993); (b) Andersen eightstage, non-viable, 1 ACFM ambient air sampler (from Andersen Instruments Inc.).
100
90
stage 7
80
6
5
4
3
2 1
0
70
60
impaction
probability 50
(%)
40
preimpactor
30
20
10
0
0.1
Figure 9.8
1
10
aerodynamic particle diameter, Dp,aero (µm)
100
Particle collection efficiency for each stage of an Andersen eight-stage, 1 ACFM
ambient air sampler with preimpactor (redrawn from Andersen Instruments, Inc.).
653