Parish, H
Senior Director, Analytical Chemistry Department, SRI International, 333 Ravenswood Avenue, Menlo Park, CA, 94025

Key-Schwartz, R
Research Chemist, National Institute of Occupational Safety and Health, Alice Hamilton Laboratory, 5555 Ridge Ave., Cincinnati, OH, 45213

Popp, D
QC Coordinator, Wisconsin Occupational Health Laboratory, Wisconsin State Laboratory of Hygiene, PO Box 7996, Madison, WI, 53707-7996

Hayes, T
Analytical Chemistry Manager, SRI International, 333 Ravenswood Avenue, Menlo Park, CA, 94025


(Received 29 April 2004; accepted 11 January 2006)
JOURNAL JAI
Abstract

SRI International has prepared dynamically generated silica samples since 1980 for the National Institute of Occupational Safety and Health (NIOSH) and the American Industrial Hygiene Association (AIHA) Proficiency Analytical Testing (PAT) programs. Aerosol-generated samples were developed in 1980 to more closely approximate real world samples and to improve intrabatch precision. Liquid-generated samples may provide tighter control limits, and this method has been reexamined as the generation procedure of choice. Sample preparation procedures have also been investigated to minimize analytical uncertainty and, hence, obtain a true evaluation of the sampling error. Samples were analyzed by SRI, NIOSH, and the Wisconsin Occupational Health Laboratory, using X-ray diffraction or Fourier transform infrared spectrometry (FTIR). Results were plotted and statistically evaluated, then compared to the existing PAT interlaboratory database.

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Title An Evaluation of Aerosol- and Liquid-Generated Silica Samples for Proficiency Analytical Testing Symposium Silica: Sampling and Analysis, 2004-04-23 0:00:00 Committee D22 on