Air Toxics In Ambient

In addition to the reference methods, the EPA has developed methods to detect toxic and radioactive pollutants under NESHAP. Table 5.9.3 lists these test methods as well as methods for the analysis of low concentrations of organics in ambient air.

The EPA's Atmospheric Research and Exposure Assessment Laboratory (AREAL) has also developed a compendium of methods for quantifying HAPs in ambient air. Table 5.9.4 identifies the methods, and Figure 5.9.4 shows the categories of HAPs in the compendium. Two popular methods are compendium method TO-13 for semivolatiles and TO-12 for VOCs. Method TO-13 describes a sampling and analysis procedure for semivolatiles, such as benzo(a)pyrene and polynuclear aromatic hydrocarbons (PAHs). Compendium method TO-14 involves the collection of VOHAPs in stainless canisters.

A copy of the compendium of methods can be obtained from the following:

U.S. EPA, Atmospheric Research and Exposure Assessment Laboratory (AREAL), MD-77, Research Triangle, NC 27711.

Noyes Publication, Mill Road at Grand Ave., Park Ridge, NJ 07656.

A copy of the statement of work (SOWs) for HAPs from superfund sites can be obtained from the U.S. EPA, Office of Solid Waste and Energy Response, Analytical Operation Branch, 401 M St., S.W., Washington, DC 20460.

Many of the sampling and analytic procedures recommended most likely need additional development and validation to improve accuracy and precision. A method that requires validation is not an inferior method; the method simply requires additional experimentation to define accuracy, precision, and bias. The environmental engineer begins experimental work with analyses of a known concentration of the target pollutant. Then, the engineer determines the potential interferences by repeating the tests

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