Standards Development
This International Standard gives practical guidance for identification ad quantitative measurement (weight percentage content) of crystalline silica (CS) major polymorphs (quartz and cristobalite) in bulk samples using XRPD methods, with general information about their capabilities and limitations of relevance to laboratories working for routine testing.
Only X-ray diffractometers with Bragg-Brentano geometry are considered. The analyzed specimen should be in the form of loose powder. Although a number of types of analysis are considered, other types of analysis could be considered if demonstrated to give equivalent results.
The knowledge of CS content in natural rocks and soils is useful when, for example, assessing potential exposure by inhalation of airborne dust meeting the respirable convention of ISO 7708 in work activities that involve excavation, earth moving, and drilling plant operations. Higher exposures to respirable CS are often found in confined spaces, such as in mining and tunnelling. Knowing the weight fraction of CS in construction materials and natural rocks or soils improves the characterization of potential sources of airborne dust and allows planning of risk management measures in order to reduce potential exposures to airborne dust.
This technique can also be used for the analysis of samples, which have been collected for the purpose of classification and labelling of chemicals according to the Globally Harmonized System (GHS), when a CS phase is found as a “substance”, or in “mixtures” and “articles”, as defined in the GHS.
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