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Methods used by the United States National Institute for Occupational Safety and Health to monitor crystalline silica.

Authors
Lorberau-CD; Abell-MT
Source
Scand J Work, Environ & Health 1995 Sep; 21(Suppl 2):35-38
NIOSHTIC No.
00230569
Abstract
Methods used by NIOSH to monitor exposures to crystalline silica (14808607) dusts were discussed. Analytical methods used by NIOSH to determine silica concentrations in workplace air were summarized. There were four currently used NIOSH methods for determining silica in dust samples. They were based on three instrumental techniques: colorimetry, denoted method 7601; X-ray powder diffraction (XRD), denoted method 7500; and infrared spectroscopy (IR), two methods denoted 7602 and 7603. The sample collection for the four methods was similar. Breathing zone samples were collected by a 10 millimeter Dorr-Oliver nylon cyclone (DO cyclone) and a polyvinyl- chloride (PVC) filter. The cyclone removed the nonrespirable particles from the sample allowing only the respirable particles to be collected on the filters. The samples then were subjected to ashing or chemical dissolution to remove the PVC filter from the collected dust before analysis. The limit of detection was approximately 5 micrograms (microg) per sample for each of the four methods; however, accuracy was poor, especially at low filter loadings, 30microg/sample or lower. Filter loadings of this magnitude frequently occurred when concentrations in the workplace air approached the NIOSH recommended standard, 50microg per cubic meter. Improvements in the analytical procedures over the past few years were discussed. Laboratory proficiency has been improved following implementation of the Proficiency Analytical Testing Program, a program administered by the American Industrial Hygiene Association.
Keywords
NIOSH-Author; Quartz-dust; Analytical-methods; Infrared-spectroscopy; X-ray-analysis; Occupational-exposure; Industrial-hygiene; Dust-analysis; Respirable-dust
CODEN
SWEHDO
CAS No.
14808-60-7
Publication Date
19950901
Document Type
Journal Article
Fiscal Year
1995
NTIS Accession No.
NTIS Price
ISSN
0355-3140
NIOSH Division
DPSE
Source Name
Scandinavian Journal of Work, Environment and Health
State
OH
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