Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Occupational Safety And Health Administration Methods.

Authors
Dixon-WC
Source
Workshop on Asbestos: Definitions and Measurement Methods, National Bureau of Standards, U.S. Department of Commerce, NBS Special Publication No. 506 1978 Nov:431-440
Link
NIOSHTIC No.
00146040
Abstract
Methods used by OSHA for the analysis of asbestos (1332214) are described. Equipment at one laboratory is described. Phase contrast microscopes equipped with a polarizer, an analyzer, retardation plates, and rotating stage are explained. X-ray diffraction and transmission electron microscopes with energy dispersive units are also described. Routine determinations of airborne asbestos are made by the membrane filter method at a magnification of 400 to 450 times. Bulk samples are examined on a reflected light stereo microscope. Percentage of asbestos in talc (14807966) samples is determined by particle counting. Analysis of membrane samples is discussed in some detail. Optical tests for asbestos or other fibers are divided into two categories: those performed with fibers on the membrane and those performed after fibers are removed from the membrane. Polarized light, angle of extinction, retardation of color pattern, and dispersion staining are used to identify asbestos. A system for differentiating between the various asbestos fibers is discussed. Directions for the dispersion staining identification of asbestos minerals and wollastonite (13983170), a common interference, are outlined.
Keywords
Safety-practices; Regulations; Air-monitoring; Fibrous-dusts; Airborne-dusts; Chemical-analysis; Air-contamination; Asbestos-dusts; Dusts; Air-sampling;
CAS No.
1332-21-4; 14807-96-6; 13983-17-0;
Publication Date
19781101
Fiscal Year
1979
NTIS Accession No.
NTIS Price
Source Name
Workshop on Asbestos: Definitions and Measurement Methods, National Bureau of Standards, U.S. Department of Commerce, NBS Special Publication No. 506
TOP