Dust exposure in asbestos processing.
Weidner RB; Ayer HE
Transactions of the 34th Annual Meeting of the American Conference of Governmental Industrial Hygienists, May 14-16, 1972, San Francisco, California. Cincinnati, OH: American Conference of Governmental Industrial Hygienists, 1972 May; :103-124
The results of environmental surveys of several asbestos (1332214) processing plants are presented. It was observed that the sources of airborne particulates in the plants could be classified into the following categories: fibrous asbestos; asbestos type materials such as serpentine and antigorite; nonasbestos type minerals occurring with asbestos such as magnetite (1309382), periodotile, chromite (1308312), nickel (7440020), and quartz (1317799); other process materials such as cotton, rayon (9006024), and glass fiber; and non- process air pollutants from heaters, smokestacks, and general atmospheric conditions. The results of the surveys indicated that asbestos dust concentration as measured by the membrane filter method was generally below the existing emergency standard of an 8- hour time-weighted average airborne concentration of 5 fibers/ml for fibers greater than 5 microns in length, as set by the federal Occupational Safety and Health Act. Based on the limited number of samples collected and analyzed during the study, it appeared that position of the field monitor on the workers had no influence on the resulting concentrations recorded. There was little variability between samples collected side-by-side, especially at the lower concentrations.
Silicates; Sampling-methods; Legislation; Methodology
1332-21-4; 1309-38-2; 1308-31-2; 7440-02-0; 1317-79-9; 9006-02-4
Transactions of the 34th Annual Meeting of the American Conference of Governmental Industrial Hygienists, May 14-16, 1972, San Francisco, California