Recognized Analytical Methods -US
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Today in the United States, the most accepted methods for analysis of quartz are
XRD, IR, and, to a limited extent, colorimetric. The three government agencies
have contributed established methodology which differ slightly (OSHA exclusively
uses XRD, MSHA uses both IR and XRD, and NIOSH has published methods or all
three techniques): XRD: Methods are OSHA ID-142, NIOSH 7500. Subtle differences
are noted in correction factors for self-absorption and sample preparation. IR:
Methods are MSHA P-7 and NIOSH 7602. Subtle differences are noted in sample
preparation. Colorimetric: Method NIOSH 7601 The methods for all substances
developed by the three agencies have been well-documented, tested, and are
performance-driven; when one method fails to perform, it soon becomes obsolete.
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