Some commonly used components in stack sampling systems are shown in Figure 5.11.8. If ball-and-socket joints and compression fittings are used, any arrangement of components is readily set up for field use. Environmental engineers select the stack sampling components on the basis of the source to be sampled, the substances involved, and the data needed.
Industrial hygienists developed a summary of sampling procedure outlines for specific substances (Vander Kolk 1980). After considering the complications that might arise from the presence of interfering substances in the gas samples, an environmental engineer should use the procedural outlines as a starting point in assembling a stack sampling system. The American Society for Testing and Materials (1971) provides other recommended sampling procedures for gases and vapors.
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