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Evaluating mass respirable and dust count sampling techniques.

Authors
Blehm-KD; Buchan-RM
Source
Occup Health Saf 1979 Mar; 48(2):48-50
NIOSHTIC No.
00091761
Abstract
Thirty paired breathing zone samples were collected using commercially available sampling equipment during clay mixing operations at a small pottery operation to evaluate mass respirable and dust count techniques for an aerosol containing free crystalline silica (7631869). The first 10 sample pairs were collected during actual mixing operations, the second 10 after the aerosol cloud had dispersed for 10 minutes, and the final 10 after the cloud had settled for 20 minutes. Mean time weighted average (TWA) concentrations were calculated for respirable and total dust. Ninety nine percent of all particles sampled were in the respirable size range, and concentrations of respirable dust exceeded the threshold limit value (TLV) of 0.1 milligrams per cubic meter. Although TWA dust count concentrations exceeded the TLV of 2.72 millions of particles per cubic foot only during actual mixing operations, an overall potential hazard was suspected. The authors conclude that workers were exposed to high concentrations of free silica dust and, consequently, should use protective equipment. Respirable mass information alone may not be sufficient to assess a potential hazard, since a mass bias toward larger particles in the respiratory region may exist. Additional research is suggested to explore the bias possibility.
Keywords
OHSADO; NIOSH-Publication; NIOSH-Grant; Respirable-dusts; Particle-counters; Sampling-equipment; Aerosol-mists; Respiratory-system-disorders; Personal-protective-equipment; Industrial-hazards; Pottery-products
Contact
Microbiology Colorado State University Department of Microbiology Fort Collins, Colo 80523
CODEN
OHSADQ
CAS No.
7631-86-9
Publication Date
19790301
Document Type
Journal Article
Funding Amount
906250
Funding Type
Grant
Fiscal Year
1979
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-T01-OH-07039
Issue of Publication
2
ISSN
0362-4064
Priority Area
Respiratory-system-disorders
Source Name
Occupational Health and Safety
State
CO
Performing Organization
Colorado State University, Fort Collins, Colorado
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