Table I.
Experimental, theoretical, and physical characteristics of several commonly used bioaerosol samplers.
Sampler
d50 True µm
d50 Theoretical µm
- holes
Q
Dj or Wj
Aj
Uj
L/min
mm
mm2
m/s
Andersen 6-Stage [Andersen 1958, 1984] Stage 1 7.0 Stage 2 4.7 Stage 3 3.3 Stage 4 2.1 Stage 5 1.1 Stage 6 0.65
6.24 4.21 2.86 1.84 0.94 0.58
400 400 400 400 400 400
28.3 28.3 28.3 28.3 28.3 28.3
1.18 0.914 0.711 0.533 0.343 0.254
1.10 0.656 0.397 0.223 0.092 0.051
1.08 1.80 2.97 5.28 12.8 23.3
Andersen 2-Stage [Phillips 1990] Stage 0 Stage 1
6.28 0.83
200 200
28.3 28.3
1.50 0.400
1.77 0.126
1.33 18.8
Andersen 1-Stage [Andersen 1958; Phillips 1990] Stage N6 0.65
0.58
400
28.3
0.254
0.051
23.3
Mattson-Garvin Slit-to-Agar
0.53
1
28.3
0.152
6.23
75.7
0.30
1
12.5
1.00
0.785
265.
1.97 1.52
219 260
90 180
1.00 1.00
0.785 0.785
8.72 14.7
8.0 0.95
Ace Glass All-Glass Impinger-30
PBI Surface Air Sampler [Lach 1985] Compact Standard
2.0 2.0
BIOTEST Reuter Centrifugal Sampler [BIOTEST undated; Macher and First 1983] Standard 3.8 7.5 RCS-Plus
280
Membrane Filter Samplers Burkard Spore Trap (1,7-Day) Standard Nozzle High Efficiency Nozzle
3.70 2.17
1 1
10 10
2.00 2.00
28.0 10.0
5.95 16.7
Burkard (Personal) Sampler Slit Seive
4.18
1 100
10 20
1.00
0.785
1.94
Burkard May-Type Multi-Stage Impinger Stage 1 10 Stage 2 4 Stage 3
1 1 1
20 20 20
Allergenco MK-2
1
Where: d50 = Cut-diameter or aerodynamic diameter above which the collection efficiency of the impactor approaches 100%, both the true and the theoretical d50s are shown; Q = Airflow rate; Dj or Wj = Diameter of seive or hole j/Width of slit j; Aj = Area of hole j or slit j; and Uj = Velocity of air through hole j or slit j.
1/15/98
90
NIOSH Manual of Analytical Methods
