encountered in the field, and can be used to validate the accuracy of lab measurements needed to meet OSHA regulations. The reduction to ash technique must be used to prepare the quartz-on-filter specimens for XRD measurements.

A related series of reference materials using cristobalite, the second-most important form of respirable crystalline silica, also is being developed. Standard Reference Materials are among the most widely distributed and used products from NIST. The agency prepares, analyzes and distributes well over a thousand different materials that are used throughout the world to check the accuracy of instruments and test procedures.

Source-Eurekalert
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