Exam (elaborations)
CIH. Air sampling Questions and Answers 2024
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Exam of 6 pages for the course CIH at CIH (CIH. Air sampling)
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CIH. Air samplingaerosol or particulate matter - answer solid or liquid particles dispersed in gaseous
medium
examples of aerosol producing occupations - answer mining, welding, spray painting
types of aerosols - answer dust, fumes, mists, smokes and fibers
dust - answer dry particle aerosols produced by mechanical processes (1 um to 1 mm)
fumes - answer very fine solid aerosol particles produced from vaporized / condensation
of solids (arc welding, metal fumes) 0.01-10um
mists - answer spherical droplet aerosols produced by mechanical processes um to <
100 um
smokes - answer complex mixture of solid and liquid aerosol particles, gases and
vapors resulting from incomplete combustion.
fibers - answerElongated particles with an aspect ratio greater than 3:1
Dust categories - answerInhalable, Thoracic and Respirable
Inhalable - answer100um or less; reaches the bronchile
Thoracic - answer10 um or less; bifurcation
Respirable - answer4 um or less; reaches alveoli (non ciliated portions of the lung)
Pump and filter - answerGravimetric testing where results are in grams (ug or mg).
Need to know air volume through filter.
Filters - answerFilters efficiently will remove particles that are much smaller than the
pore size. A pore size of 0.8um (99% efficiency) will create more resistance than a 5 um
(95% efficiency) creating larger velocity, impact and efficiency.
Cassette filters - answer25, 37 or 47 mm; leakage may be a problem if assembled
improperly.
Asbestos cassettes - answer25mm with an extended cowl filter.
, Fiber filters - answerOptions: Cellulose, glass (pesticides, PNAs and CTPV) and quartz.
These have loading capacity
High sample flow rates
Mixed cellulose ester (MCE) - answerDissolved easily for metal analysis (Atomic
Absorption Spectroscopy analysis) metals, asbestos and oil mist.
Polyvinyl chloride (PVC) - answerPolyvinyl chloride used to test for silica, dusts, zinc
oxide and chromium VI.
Polycarbonate filters - answerUsed for TEM analysis. Method that EPA don't like. Not
for asbestos.
Polyester foam - answeran emergent filtration technology.
PTFE (teflon) - answerPolytetrafluoroehylene used to test for antrax, SARS, warfarin
and benzidine.
PTFE (teflon) with XAD-2 - answerUsed to test for Polycyclic Naphtalene Aromatics
(PNAs) and coal tar pitch volatiles
Cassette with cyclone - answerGenerate a 100 times the normal gravitational forces as
air swirls around several times. Used for respirable dust and operates from 1.7 - 2.5
lpm.
IOM sampler - answerSimulates collection of inhalable particles inhaled by mouth and
nose. 2lpm
Aerodynamic diameter - AD (um) - answerdiameter of unit density sphere having same
terminal velocity as the particle in questions regardless of its geometric size, shape or
diameter. Compared or relative to a water droplet. For fibers, d*x^2 and for particles, d*
root square x. d=diameter of the fiber or particle and x = density of the chemical of
interest.
Cut point respirable - answer50 percentile (4 um) of the particles will get to the alveoli
region
Cut point Thoracic - answer50 percentile (10um) of the particles will get to the
bifurcation region
Cut point inhalable - answer50 percent (100umg) of hte particles will get to the
bronchiole
Konimeter - answerImpacts particles on a slide for MPPCF.
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