SKC 225-370 Sioutas Cascade Impactor - Manual (Page 7)

7
Sampling
Notes:
• As the particle load on the aft er-fi lter increases during sampling, the pressure
drop will also increase. Therefore, use a compensating sample pump such as
the Leland Legacy (SKC Cat. No. 100-3002).
• Back pressure on PTFE fi lters can vary within the same lot.
• The Sioutas Impactor may be used for ambient outdoor sampling with the
following provisions:
1. Wind velocity is < 5 mph
2. The impactor plates are not overloaded. See NUATRC Report No. 2
at www.sph.uth.tmc.edu/mleland/att achments/MLeland_Sioutas2.pdf
for information on maximum particle load per stage.
1. Following calibration, remove and set aside the
representative sample media. Replace with new,
preweighed media (see Media and Impactor
Preparation and see Assembly).
2. Turn on the pump and record sample start time
and other pertinent data.
3. Aft er the desired sample time has elapsed, turn
off the pump and record sample stop time.
4. Remove pump and tubing. Transport samples and
pertinent sampling information to a laboratory
for analysis (see Removing and Transporting the
Samples).
Removing and Transporting the Samples
Disassemble the stages (see Disassembly). Using forceps, carefully remove fi lters
for weighing and analysis. If transporting samples to an off site laboratory, place
samples in marked, sealed containers and transport.
Caution: Clearly indicate on sample containers and chain-of-custody forms the
stage from which each fi lter was removed.
Caution: Package and transport samples in a manner that will prevent sample
loss and contamination.
Analysis
Size-fractionated gravimetric, chemical, and microscopic analyses.
Sioutas Impactor in
sampling train