Page:NIOSH Manual of Analytical Methods - Chapter J.pdf/9

 Table I.

Experimental, theoretical, and physical characteristics of several commonly used bioaerosol samplers.

Sampler

d50 True µm

d50 Theoretical µm


 * 1) 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