British Standards Institution

Source:: ISO
Committee:: EH/2/2 - Work place atmospheres
Categories:: Workplace atmospheres
Comment period start date:: 06/02/2025
Comment period end date:: 01/04/2025
Number of comments:: 4

Comment by:

1st Apr

Scope

This document specifies three methods for quantitative measurement of crystalline silica (CS) major polymorphs (quartz and cristobalite) weight percentage content in bulk samples using XRPD. General information is provided about their capabilities and limitations of relevance to laboratories working for routine testing.

Only X-ray diffractometers with Bragg-Brentano geometry are considered. The analysed specimen should be in the form of loose powder, where the median grain size is between 1 and 10 μm physical diameter. Block specimens are not considered.

Although a number of methods of analysis are considered in this document, other XRPD methods of analysis could be considered if demonstrated to give equivalent results.

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Please email further comments to: debbie.stead@bsigroup.com

Standard timeline

1. Proposal (Complete)

Proposal start date:

2. Draft (Complete)

Draft start date:

04/12/2024

3. Public Comments

Public Comments start date:

06/02/2025

Public Comments end date:

01/04/2025

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Standards Development

BS ISO 6868 ISO 6868 Workplace air. Quantitative determination of quartz and cristobalite in bulk materials by X-ray powder diffraction methods

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