Medical and Pharmaceutical Aerosols - Aerosols: Measurement, Dosimetry, and Health Effects - page 15

TABLE 1.4
Aerodynamic Cutoff Diameters ( μ m) for Instruments That Determine Particle Size by Inertial Impaction as Reported by the
Manufacturer

Twin-Stage
Liquid
Impinger

Andersen
Viable
Impactor

Andersen Nonviable
Impactor

Next Generation
Impactor

Marple-Miller
Impactor

Apparatus USP B Multistage Impinger Delron

Flow Rate
(L/min)

Stage 60 60 30 60 80 100 28.3 28.3 60 90 30 60 100 30 60 90 12.5

Pre-separator — — — — — — — — — — 15.0 13.0 10.0 — — — —

−1 — — — — — — — — 8.6 8.0 — — — — — — —

0 6.4 9.8 — — — — 7.1 9.0 6.5 6.5 — — — — — — —

1 — — 16.9 13.3 11.8 10.4 4.7 5.8 4.4 5.2 11.0 7.8 6.0 10.0 10.0 8.0 11.2

2 — — 9.3 6.7 5.6 4.9 3.3 4.7 3.3 3.5 6.6 4.6 3.6 5.0 5.0 4.0 5.5

3 — — 4.5 3.2 2.7 2.4 2.1 3.3 2.0 2.6 3.9 2.7 2.1 2.5 2.5 2.0 3.3

4 — — 2.5 1.7 1.4 1.2 1.1 2.1 1.1 1.7 2.3 1.6 1.2 1.25 1.25 1.0 2.0

5 — — — — — — 0.65 1.1 0.54 1.0 1.4 0.96 0.72 0.63 0.63 0.6 0.9

6 — — — — — — — 0.7 0.25 0.43 0.84 0.57 0.42 — — — 0.5

7 — — — — — — — 0.4 — — 0.51 0.33 0.23 — — — —

MOC — — — — — — — — — — 0.31 0.13 0.055 — — — —

Source: Dunbar, C. et al., KONA , 16, 7, 1998.
MOC, micro-oriice collector.