Free Crystalline Silica (Respirable Quartz) by X-Ray Diffraction

Inhaled crystalline silica (Respirable Quartz) is among the most common work-related exposures worldwide, exacting a heavy health toll each year. In Canada, silica is ranked as the third highest industrial carcinogen in terms of number of workers exposed.

CASL offers a direct determination of Free Crystalline Silica on the preweighed 25mm silver membrane filters (0.8 or 5 micron pore size) by XRD. This procedure is the equivalent to the NIOSH7500 method, except it enables a bypass of the unnecessary and time consuming dust transfer from one filter media to another. Our method is based on OHSA – Ontario Regulation 769/83, amended 512/92. The original NIOSH7500 method can be followed upon request.

Respirable Quartz by XRD

Calibration quartz standards are prepared by CANMET in a circulating dust channel using Min-U-Sil silica dust standard.

We are also able to determine Cristobalite and Tridymite – two other polymorphs of Free Crystalline Silica. Our calibration filters for these are prepared in-house using NIOSH Cristobalite and Tridymite standards.

CASL Laboratory has two identical Seimens X-Ray Diffraction instruments equipped with sample changers, dedicated to Respirable Quartz analysis.
As a result, the laboratory can handle a large volume of samples with zero down time.

CASL is also set up to analyze bulk materials for Free Crystalline Silica concentration.

CASL laboratory is accredited by CALA in accordance with the recognised International Standard
ISO/IEC 17025:2005. This accreditation demonstrates technical competence for a defined scope and the operation of a laboratory quality management system (refer joint ISO-ILAC-IAF Communiqué dated January 2009 www.ilac.org)

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