NIOSH 1973 Dec:11 pages
A method for sampling and analyzing vinyl-chloride (75014) was developed by NIOSH. A known volume of air was drawn through a charcoal tube to trap the vinyl-chloride present. The vinyl- chloride was desorbed using carbon-disulfide. An aliquot of the desorbed sample was injected into a gas chromatograph and the resulting peak was compared with areas obtained from the injection of standards. The minimum detectable amount of vinyl-chloride was found to be 0.2 nanograms per injection. Five liters was found to be the volume of air containing 200 parts per million of vinyl- chloride which could be sampled before a significant amount of vinyl- chloride was found on the backup section. The authors recommend that the total volume to be sampled should not exceed 5.0 liters. If a high concentration of contaminants or high humidity is suspected, the sampling volume should be reduced by 50 percent. The sampling device is recommended as being small, portable, and involving no liquids. Interferences are minimal, and most can be eliminated by altering chromatographic conditions. The methods can also be used for the simultaneous analysis of two or more components suspected of being present in the same sample by simply changing gas chromatographic conditions from isothermal to a temperature programmed mode of operation.
Chemical-properties; Chemical-analysis; Halogens; Chromatographic-analysis; Sampling-methods; Analytical-methods; Air-monitoring; Sampling-equipment; Atmosphere-analyzers;
Physical and Chemical Analysis Branch, NIOSH Center for Disease Control, Public Health Service, U.S. Departmement of Health, Education, and Welfare, 11 pages, 2 references