ISO 16258-1-2015 PDF

Full title and description

ISO 16258-1:2015 — Workplace air — Analysis of respirable crystalline silica by X‑ray diffraction — Part 1: Direct‑on‑filter method. This standard specifies a laboratory and field‑compatible procedure for measuring respirable crystalline silica (RCS) collected on air sampling filters using X‑ray diffraction where the dust deposited on the sample filter is analysed directly.

Abstract

ISO 16258-1:2015 describes the direct‑on‑filter XRD analytical approach for RCS: instrumental parameters, recommended sampling (25 mm filters), typical filter types, sensitivity considerations, correction for absorption and interferences, and reporting considerations. The method targets the most common crystalline silica polymorphs (quartz and cristobalite) and notes limitations for less common polymorphs and for low dust loads that can affect measurement uncertainty.

General information

• Status: Published / Current (confirmed at systematic review).
• Publication date: September 2015 (published edition 1, 2015‑09).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 13.040.30 (Workplace atmospheres).
• Edition / version: Edition 1 (2015).
• Number of pages: 26 (official ISO publication page listing).

These bibliographic and lifecycle details are taken from the ISO catalogue entry for ISO 16258‑1:2015 (the publication was reviewed and confirmed in 2020 and remains current according to ISO).

Scope

Specifies the analysis of respirable crystalline silica (RCS) in workplace air samples collected onto 25 mm sampling filters by X‑ray diffraction where the dust on the sample filter is analysed directly (direct‑on‑filter). The document addresses suitable samplers and filter types, instrumental scan parameters and detection considerations, absorption and interference corrections, and limitations (for example, low filter dust loads or low silica content can increase expanded uncertainty). Quartz and cristobalite are included; less common polymorphs (e.g., tridymite) are excluded where appropriate reference materials are unavailable.

Key topics and requirements

• Sampling: guidance on air sampling practice for RCS, typically using 25 mm filters and compatible samplers and pumps.
• Direct‑on‑filter XRD analysis: recommended instrumental parameters, scan strategies and detector considerations for direct measurement of filter deposits.
• Filter selection and handling: discussion of common filter materials, advantages/disadvantages, and batch‑testing to monitor background interferences.
• Interference and absorption corrections: procedures to identify and correct for matrix interferences and X‑ray absorption effects that affect peak intensities.
• Detection limits and sensitivity: guidance on achievable limits of detection/quantification and factors that influence sensitivity (dust loading, matrix, instrument).
• Uncertainty and quality: notes on circumstances where uncertainty may not meet performance criteria and reference to guidance for uncertainty calculation (see ISO 24095).

Technical details and requirements are drawn from the standard text and companion guidance references for RCS measurement.

Typical use and users

Primary users: occupational hygienists, industrial hygiene laboratories, analytical chemistry laboratories, regulators and compliance bodies, workplace health & safety professionals, and organizations performing exposure assessment in industries with silica dust (mining, construction, tunnelling, foundries, ceramics, stone‑cutting). The standard supports routine monitoring, compliance sampling, method validation and inter‑laboratory comparability.

Related standards

ISO 16258 is a multi‑part series — Part 2 (ISO 16258‑2:2015) covers the indirect‑analysis (dust transfer) XRD method; ISO 24095 provides guidance on measurement quality and uncertainty for RCS analyses (used in conjunction with ISO 16258 methods). Other related documents include national methods for RCS and relevant EN standards for workplace measurement performance.

Keywords

respirable crystalline silica, RCS, quartz, cristobalite, X‑ray diffraction, XRD, direct‑on‑filter, workplace air, occupational hygiene, filter analysis, measurement uncertainty, filter sampling.

FAQ

Q: What is this standard?

A: ISO 16258‑1:2015 is an international standard that specifies a direct‑on‑filter X‑ray diffraction method for analysing respirable crystalline silica collected from workplace air.

Q: What does it cover?

A: It covers sampling (typically 25 mm filters), the XRD analysis of dust deposited on those filters, instrumental settings, filter materials and handling, interference and absorption corrections, sensitivity and limits, and reporting considerations; it focuses on quartz and cristobalite.

Q: Who typically uses it?

A: Occupational hygienists, accredited analytical laboratories, employers and safety regulators who need validated methods for assessing worker exposure to respirable crystalline silica.

Q: Is it current or superseded?

A: The standard was published in September 2015 (Edition 1) and was last reviewed and confirmed by ISO in 2020; it remains the current ISO publication for Part 1 as listed in the ISO catalogue.

Q: Is it part of a series?

A: Yes — ISO 16258 comprises at least two parts: Part 1 (direct‑on‑filter) and Part 2 (indirect/dust transfer). Users commonly apply Part 1 or Part 2 depending on analytical workflow, and use ISO 24095 for measurement quality guidance.

Q: What are the key keywords?

A: Respirable crystalline silica, quartz, cristobalite, XRD, direct‑on‑filter, workplace air, occupational hygiene.