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Electron microscopy study of refractory ceramic fibers.

Authors
MacKinnon-PA; Lentz-TJ; Rice-CH; Lockey-JE; Lemasters-GK; Gartside-PS
Source
Appl Occup Environ Hyg 2001 Oct; 16(10):944-951
NIOSHTIC No.
20021803
Abstract
In epidemiological studies designed to identify potential health risks of exposures to synthetic vitreous fibers, the characterization of airborne fiber dimensions may be essential for assessing mechanisms of fiber toxicity. Toward this end, air sampling was conducted as part of an industry-wide study of workers potentially exposed to airborne fibrous dusts during the manufacture of refractory ceramic fibers (RCF) and RCF products. Analyses of a subset of samples obtained on the sample filter as well as on the conductive sampling cowl were performed using both scanning electron microscopy (SEM) and transmission electron microscopy (TEM) to characterize dimensions of airborne fibers. Comparison was made of bivariate fiber size distributions (length and diameter) from air samples analyzed by SEM and by TEM techniques. Results of the analyses indicate that RCF size distributions include fibers small enough in diameter (< 0.25 microm) to be unresolved by SEM. However, longer fibers (> 60 microm) may go undetected by TEM, as evidenced by the proportion of fibers in this category for TEM and SEM analyses (1% and 5%, respectively). Limitations of the microscopic techniques and differences in fiber-sizing rules for each method are believed to have contributed to the variation among fiber-sizing results. It was concluded from these data that further attempts to characterize RCF exposure in manufacturing and related operations should include analysis by TEM and SEM, since the smallest diameter fibers are not resolved with SEM and the fibers of longer length are not sized by TEM.
Keywords
Airborne-fibers; Scanning-techniques; Ceramics; Analytical-instruments; Analytical-processes
CODEN
AOEHE9
Publication Date
20011001
Document Type
Journal Article
Fiscal Year
2002
NTIS Accession No.
NTIS Price
Issue of Publication
10
ISSN
1047-322X
NIOSH Division
EID
Source Name
Applied Occupational and Environmental Hygiene
State
OH
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