By Henry J. McDermott
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This publication deals ready-to-use details for measuring a large choice of airborne unsafe fabrics together with chemical substances, radon, and bioaerosols. It offers the latest procedures for air sampling, gathering organic and bulk samples, comparing dermal exposures, and deciding upon the benefits and boundaries of a given air tracking approach.
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It is important that employees exposed to such hazards must be apprised of both the change in body function and the signs and symptoms to signal any change that may occur. qxd 7/19/04 6:24 PM Page 36 36 HAZARDS ardous agents that are evaluated through air sampling. Bacteria and fungi are unique because they are living organisms and thus can multiply and grow. Many have more than one growth stage. In the spore stage the organism is encapsulated, is somewhat indifferent to temperature, and often behaves as a particle, whereas in the growth stage it can assume many different appearances but generally must be collected on some type of growth medium.
Sampling bags made of Tedlar or Teﬂon can be used when the air concentration is above the LOD (and so the ambient air can be analyzed directly back in the laboratory). A sampling pump or other means is used to ﬁll the bag with ambient air. Bags are rarely used when another sample collection method is feasible due to the bulk of the bag, shipping limitations, and the possibility of sample degradation prior to analysis. Particulate Matter. 4. Typical Air Sampling Filter Materials Filter Material Glass ﬁber Polyvinylchloride (PVC) Mixed cellulose ester (MCE) Gelatin Teﬂon Polycarbonate Characteristics High particulate retention and wet strength Low tare weight Dissolves easily High moisture content, can be pre-sterilized Strong and chemically resistant Glass-like surface, transparent and straight-through pores Typical Applications Gravimetric analysis Gravimetric analysis Metals and ﬁbers Airborne microbes Acids, bases, and solvents Gravimetric and microscopic analyses Source: Reference 3.
Hand-held photoionization detector instrument. ) (give an electrical charge) by a variety of means, and then the charged particles collected in an electric ﬁeld where the resulting current is proportional to the concentration of molecules. 12) use a UV light source to ionize contaminant molecules. Chemical compounds are subject to ionization by UV light according to their ionization potential (IP), expressed in units of electron-volts (eV). Several different UV lamps are available with varying eV intensities.
Air Monitoring for Toxic Exposures by Henry J. McDermott