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Analysis of biogenic silica fibers from rice farming operations.

Authors
Scales-D; John-W; Lawson-R; Schmidt-J
Source
Appl Occup Environ Hyg 1995 Aug; 10(8):685-691
NIOSHTIC No.
00228668
Abstract
A method was developed to quantitate biogenic silica (7631869) fibers. Particles were sampled over track etched filters that were prepared by the direct cleaning method for transmission electron microscope (TEM) analysis. The method was used to analyze about 100 samples from rice field operations. For sampling in the vicinity of field operations, it was advantageous to precede the filters with cyclones to exclude large, nonrespirable structures that obscured fibers on the filter. The optimum fiber loading on the filter was 100 to 1,000 fibers/square millimeter. To prevent overloading, the sampled volume was held to 30 liters through the 25 millimeter filters, providing a detection limit of 0.1 fiber/cubic centimeter. The method produced useful results in the rice emissions study. The present method represented a further development of the TEM method for biogenic silica fibers, the only general method currently available. The authors suggest that the method be regarded as provisional due to the lack of interlaboratory testing and use by others.
Keywords
NIOSH-Publication; NIOSH-Cooperative-Agreement; Silica-dusts; Dust-exposure; Airborne-fibers; Analytical-methods; Sampling-methods; Agricultural-industry; Fibrous-dusts; Plant-substances;
CODEN
AOEHE9
CAS No.
7631-86-9;
Publication Date
19950801
Document Type
Journal Article
Funding Amount
1055222
Funding Type
Cooperative Agreement
Fiscal Year
1995
NTIS Accession No.
NTIS Price
Identifying No.
Cooperative-Agreement-Number-U07-CCU-906162
Issue of Publication
8
ISSN
1047-322X
Source Name
Applied Occupational and Environmental Hygiene
State
CA
Performing Organization
University of California - Davis
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