By Henry J. McDermott
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This ebook deals ready-to-use info for measuring a large choice of airborne detrimental fabrics together with chemical compounds, radon, and bioaerosols. It offers the latest procedures for air sampling, accumulating organic and bulk samples, comparing dermal exposures, and settling on the benefits and boundaries of a given air tracking approach.
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Additional info for Air Monitoring for Toxic Exposures
Occasionally, a substance causes an effect that is rarely seen in the population at large, such as angiosarcomas caused by vinyl chloride exposure, thus making it easier to ascertain that the occupational exposure was the primary causative factor. More often, however, the effects are common, such as pulmonary disease that is indistinguishable from the effects of smoking or hay fever and other allergic reactions. The situation is further complicated by the fact that most chemicals have not been adequately tested to determine their health hazard potential, and data do not exist to substantiate these effects.
These are sealed glass tubes containing the colorproducing reagent. 14), although battery- • A “pre-reaction” tube placed in line before the analyzer detector tube converts the contaminant of interest into a chemical compound that can be measured by the detector tube. A “pre-cleanse” tube before the detector tube removes interferences from the air sample so the contaminant of interest can be measured accurately. A “pyrolyzer” unit that uses heat to convert the contaminant to a compound that can be measured with the detector tube.
Atomic absorption spectrophotometry (AA) is used for analyzing air samples (often collected on ﬁlters) for metals. qxd 7/19/04 6:23 PM Page 21 SAMPLE COLLECTION DEVICES the how much light at one or more speciﬁc wavelength(s) that the ﬂame absorbs. The light source usually is made with a cathode made from the metal being analyzed for, which emits a spectrum of that element. AA is highly speciﬁc and has few interferences, and it routinely used for over 50 metals including lead, mercury, chromium, arsenic, copper, zinc, cadmium, nickel, beryllium, and others of occupational health or environmental concern.