Preparation of known concentrations of air contaminants.
The industrial environment - its evaluation and control, 3rd edition. Cincinnati, OH: U.S. Department of Health, Education, and Welfare, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, DHEW (NIOSH) Publication No. 74-117, 1973 Jan; :123-137
The preparation of known concentrations of air contaminants for use in evaluating air conditions in industrial locations is considered. Two general types of systems are used for generating known concentrations. Preparation of a batch mixture has the advantage of simplicity and convenience in some cases. Alternatively, a flow- dilution system may be employed. This has the advantage of being capable of providing theoretically unlimited volumes at known low concentrations, which can be rapidly changed if desired, and of compactness. The preparation of both batch mixtures of gases and vapors and the flow-dilution systems are discussed in depth. A variety of source devices is described for providing high concentrations of gases and vapors which can be diluted with pure air to the level desired. Specific advantages and disadvantages of each device are mentioned. Preparation of aerosol mixtures is more complex. Source devices for aerosol generation are discussed.
Measurement-instrumentation; Analytical-methods; Air-contaminants; Air-monitoring; Air-quality-measurement; Aerosol-dispensers; Gas-analysis; Gas-sampling; Aerosol-generators; Aerosol-particles; Equipment; NIOSH-Publication; Procedures; Methodology
The industrial environment - its evaluation and control, 3rd edition