Environmental Characterization and Mortality Experience of Attapulgite Clay Workers.
Zumwalde-RD; Ness-GO; Waxweiler-RJ
NIOSH 1980 Oct:33 pages
A retrospective cohort study of attapulgite (12174117) clay mill and mine workers at Engelhard Minerals and Chemicals Corporation (SIC- 1454) was carried out, and environmental samples were collected and analyzed. All men who worked for at least 1 month during 1940 through 1975 at the facility made up the cohort. The vital status of less than 6 percent of the workers had not been determined. Death certificates were obtained for most of the workers known to have died; the underlying cause of death was coded based on these certificates. General air samples, personal breathing zone air samples, and settled dust samples were analyzed for free silica (7631869) and trace metals. Particulates were subjected to electron microscope characterization. Iron (7439896) was the only trace metal found in any appreciable quantity. Free silica exposures were within the NIOSH recommended limit of 0.05mg/m3 as a time weighted average (TWA), and respirable dust concentrations were below the OSHA standard of 5mg/m3 as a TWA. The main constituent of samples was attapulgite clay. Individual attapulgite fibers ranged from 0.1 to 2.5 microns in length and 0.02 to 0.1 micron in diameter.
NIOSH-Author; Fibrous-dusts; Airborne-particles; Particulate-dust; Mineral-dusts; Epidemiology; Mortality-rates; Humans;
12174-11-7; 7631-86-9; 7439-89-6;
NTIS Accession No.
Division of Surveillance, Hazard Evaluations and Field Studies, NIOSH, U.S. Department of Health and Human Services, Cincinnati, Ohio, 33 pages, 16 references