SKC Limited AirChek 3000 Deluxe Pump Step By Step Guide - Manual (Page 4)

Page 2 224-G1 Issue D www.skcltd.com
Sampling Methods
Filter Sampling Inhalable (Total)
Dust
Air is drawn through a filter paper,
which traps the solid particulate e.g.
dust, aerosols & fibres. Gravimetric
analysis is usually used to measure
results (i.e. by measuring the weight
gain of the filter). Further analysis
can be carried out on the filter
to identify the specific chemicals
captured.
Sampling Respirable Dust
The I.O.M.* Sampler with a foam plug
placed in the cassette inlet is capable of
sampling respirable dust. The specific
foam separates the respirable fraction,
which is collected on the filter, from
other particle sizes.
Filter Sampling Respirable
(Alternative Method)
The Cyclone Sampler uses a filter
contained in a cassette, which
separates out the respirable fraction
of dust in the sample.
Sorbent Sampling
Sorbents are normally
contained in a small glass
tube with sealed ends. Air is
drawn through the sorbent,
which captures molecules of
the gas or vapour to be sampled. The trapped
contaminants are released using solvent
washing or heat to a gas chromatograph (GC)
for analysis. One of the best known sorbents
is charcoal.
Bag Sampling
Particularly suitable for ''grab''
or Short Term Samples (STS),
the air is passed through the
pump into a special plastic
bag. Alternative methods of
filling a bag without passing air
through a pump can also be used. The bag,
containing a relatively large volume of sampled
atmosphere is then taken to the laboratory for
analysis.
Impinger/Bubble Sampling
Air drawn into the impinger is forced
through a nozzle, which is covered by
a liquid such as high purity water. The
pollutant dissolves in the liquid and
is subsequently analysed, usually by
colorimetric techniques.
Other Methods
There are alternative samplers to those shown
above, including combinations of tube & filter,
impinger and special samplers for specific
uses such as chemically impregnated filters
and passive badges. Details of all of these
methods can be found in the SKC catalogue.
To order your copy contact our customer
services team on +44 (0) 1258 480188.
*Manufactured under license from the Institute of
Occupational Medicine TM 2043339E