Quartz PAT - Trends in Methodology
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How popular are these methods? One can use data from the American Industrial
Hygiene Association/NIOSH Proficiency Analytical Testing (PAT) Program database.
The PAT program is used to gauge the relative analytical capabilities of a large
number of laboratories for specific substances. The Program has been creating
and distributing analytical samples, and compiling/analyzing data for quartz for
approximately 25 years. Shown on the graph is the historical transition from
100% of the labs analyzing samples using the colorimetric procedure early on to
the present day where the majority of samples are analyzed by XRD. Other
indicates some labs continue to use AA, petrographic, or other technique to
analyze for quartz. Note that Rounds 1 through 30 were conducted prior to 1974.
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