By Henry J. McDermott
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This booklet bargains ready-to-use info for measuring a wide selection of airborne dangerous fabrics together with chemical compounds, radon, and bioaerosols. It offers the latest procedures for air sampling, amassing organic and bulk samples, comparing dermal exposures, and picking the benefits and barriers of a given air tracking strategy.
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Extra resources for Air Monitoring for Toxic Exposures
This is a nonspeciﬁc technique: All material on the ﬁlter is included even if it is not the contaminant of 21 interest. While most contaminants are now determined using other analytical methods that give the quantity of the compound in the air sample, materials such as wood dust, coal dust (<5% silica), metal working ﬂuid mist, cotton, and grain dust are still measured gravimetrically. There are two main approaches to gravimetric analysis: • • Weighing the ﬁlter before sampling (determining the tare weight) and then reweighing it after sampling.
On a chromatogram, each emerging compound is represented by a “peak” based on its elution time. Component identiﬁcation is made using a data “library” developed by injecting samples of known chemicals into the column and measuring the travel time for each. 9. Diagram of a typical gas chromatograph. ) of each material is represented by the area under its peak on the chromatogram. The GC’s ability to identify many different chemicals, especially those in mixtures, is achieved through proper selection of column, detector, and temperature programming.
Microscopy involves counting the number of particles or ﬁbers with some type of microscope. 10). Since this techniques counts all ﬁbers, in a “mixed” ﬁber environment it will tend to overstate the amount of asbestos. In these cases, scanning electron microscopy (SEM) or transmission electron microscopy (TEM) are two techniques that can identify and count only the asbestos ﬁbers. Microscopy is also used for bioaerosols as described below. 10. Asbestos ﬁbers under phase contrast microscopy. ) Ionizing radiation concentration or activity is generally determined by performing standard counting techniques on ﬁlters or other collection devices.
Air Monitoring for Toxic Exposures by Henry J. McDermott