By Henry J. McDermott
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This ebook bargains ready-to-use info for measuring a wide selection of airborne dangerous fabrics together with chemical substances, radon, and bioaerosols. It presents the latest procedures for air sampling, accumulating organic and bulk samples, comparing dermal exposures, and making a choice on the benefits and barriers of a given air tracking strategy.
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Extra resources for Air Monitoring for Toxic Exposures
These changes are generally indicated by the Air Monitoring for Toxic Exposures, Second Edition. By Henry J. McDermott ISBN 0-471-45435-4 © 2004 John Wiley & Sons, Inc. 1. S. Federal OSHA Hazard Communication Standard) Health Hazard A chemical for which there is statistically signiﬁcant evidence based on at least one study conducted in accordance with established scientiﬁc principles that acute or chronic health effects may occur in exposed employees. The term includes the following chemicals: • Toxic and Highly Toxic: Characteristic LD50 (oral) LD50 (dermal) LC50 (inhalation) • • • • • • • • • • • • Toxic Highly Toxic >50–500 mg/kg >200–1000 mg/kg >200–2000 ppm >2–20 mg/L £50 mg/kg £200 mg/kg £200 ppm £2 mg/L Irritant: Causes a reversible inﬂammatory effect on living tissue by chemical action at the site of contact, but is not corrosive.
Asbestos sampling is performed with the full ﬁlter face open to the ambient air in order to get an even distribution of ﬁbers across the ﬁlter since the analytic techniques involves optical counting of the ﬁbers. Inertial Impactors. These retain particulates due to impaction as the airﬂow hits a “collecting” surface. The collection efﬁciency is determined by the mass of the particulate, the characteristics of the collecting surface, and the velocity of the air stream. 8). qxd 7/19/04 6:23 PM Page 17 SAMPLE COLLECTION DEVICES • stages can be weighed after sampling to determine the mass of contaminant retained, or they can be analyzed using chemical methods.
Qxd 7/19/04 6:23 PM Page 31 REFERENCES tape past a sampling port where the pumpdrawn air sample impinges on the tape. A photometer measures the resulting color change and reports it in units of concentration. The electronic circuitry can display the concentration, store data for later downloading, and trigger alarms if preset concentration levels are exceeded. Liquid-based colorimetric instruments are used for a few applications where no other direct-reading device is available. With these instruments the air sample passes through a liquid scrubber/reagent where a color change develops based on the chemical’s concentration in the air sample.