LaMotte Air Pollution Sampling & Measurement - Manual (Page 11)

5.
At the end of the sampling period, disconnect impinging apparatus
and remove from holder. Test the absorbing solution as outlined in
the procedures in the individual test kit instructions.
devices are being used and whether these devices are operating
correctly. Heavy industrial areas contribute significantly to the total air
pollution in an area.
CONVERSIONS
The individual air pollution test sets are calibrated with readouts in parts
per million (ppm). To convert concentrations of gases and vapors from
ppm by volume to mg/M
3 and vice versa at any given temperature and
pressure, the following expression is useful:
C2 (ppm) =
C1 x 24.450 x T x 760
mol. wt. x 298 x P
C1 (mg/M 3 ) =
C2 x mol.wt. x 298 x P
24.450 x T x 760
C1 = Concentration of gas or vapor in mg/M 3
C2 = Concentration of gas or vapor in ppm
T = Absolute temperature in °Kelvin (°C + 273)
P = Absolute pressure in Torr of samples air stream (mm of mercury)
NOTE: It is usually necessary to convert the measured air flow to the
temperature and pressure of air stream.
FLOW EQUIVALENTS
1 Cu Ft/Hr = 1 Lpm =
0.016 Cu Ft/Min 60 Lph
0.471 Lpm 0.035 Cu Ft/Min
28.317 Lph 2.118 Cu Ft/Hr
471.95 cc/Min 1000 cc/Min
28317 cc/Hr 60,000 cc/Hr
0.124 Gal/Min 0.264 Gal/Min
7.481 Gal/Hr 15.852 Gal/Hr
Air Pollution Sampling & Measurement 11