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Performance of laboratories measuring silica in the Proficiency Analytical Testing program.

Authors
Shulman-SA; Groff-JH; Abell-MT
Source
Am Ind Hyg Assoc J 1992 Jan; 53(1):49-56
NIOSHTIC No.
00204982
Abstract
A study was conducted to identify trends in the reported silica (14808607) results for the first 101 rounds of the Proficiency Analytical Testing (PAT) program, particularly trends in the bias and variability of the results reported during the last 70 rounds. The silica samples sent to PAT program laboratories each round consist of five polyvinyl-chloride filters. One of the filter samples was a blank and four filters contained varying amounts of silica dust and one or more of the following contaminant dusts: magnesium-silicate, coal dust, or calcite. Analysis of the data indicates that the colorimetry (COL) method has tended to give somewhat lower results than the two other methods, x-ray diffractometry, and infrared spectrometry. This difference becomes larger at higher loadings where the COL method gives results more than 20 micrograms lower. Some possible biases appear to be associated with different particle sizes and matrices. In general, silica analyses have improved over time, and this has taken place in all three methods. Examination of the most recent round indicates that it is no longer necessary to transform the silica data for purposes of routine PAT analyses.
Keywords
NIOSH-Author; Analytical-methods; Analytical-chemistry; Chemical-analysis; Laboratory-testing; Quality-control; Silica-dusts; Mineral-dusts
CODEN
AIHAAP
CAS No.
14808-60-7
Publication Date
19920101
Document Type
Journal Article
Fiscal Year
1992
NTIS Accession No.
NTIS Price
Issue of Publication
1
ISSN
0002-8894
Source Name
American Industrial Hygiene Association Journal
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