ASTM D7948-20
Standard Test Method for Measurement of Respirable Crystalline Silica in Workplace Air by Infrared Spectrometry

Standard No.

ASTM D7948-20

Release Date

2020

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM D7948-20

Scope

1.1 This standard specifies a test method for collection and analysis of samples of airborne particulate matter for measurement of respirable crystalline silica by infrared (IR) spectrometry. 1.2 This test method is applicable to the analysis of crystalline silica (the polymorphs quartz, cristobalite and tridymite) over a working range of 0.025 to 0.4 mg/m3 for a 400 L air sample or 0.02 to 0.25 mg/m3 for a 1000 L air sample, depending on the analytical method. 1.3 The methodology is applicable to personal sampling of the respirable fraction of airborne particles and to static (area) sampling. 1.4 This test method describes three different procedures for sample preparation and infrared analysis of airborne crystalline silica samples, which are delineated in Annex A1 – Annex A3, respectively: (1) a potassium bromide (KBr) disc IR measurement method, (2) indirect IR analysis after redeposition onto a filter used for measurement, and (3) direct on-filter IR analysis. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

ASTM D7948-20 Referenced Document

• ASTM D1356 Standard Terminology Relating to Sampling and Analysis of Atmospheres*， 2024-04-21 Update
• ASTM D4532 Standard Test Method for Respirable Dust in Workplace Atmospheres
• ASTM D4840 Standard Guide for Sample Chain-of-Custody Procedures
• ASTM D5337 Standard Practice for Flow Rate for Calibration of Personal Sampling Pumps
• ASTM D6061 Standard Practice for Evaluating the Performance of Respirable Aerosol Samplers
• ASTM E1370 Standard Guide for Air Sampling Strategies for Worker and Workplace Protection
• ISO 13137 Workplace atmospheres — Pumps for personal sampling of chemical and biological agents — Requirements and test methods*， 2022-08-31 Update
• ISO 15767 Workplace atmospheres - Controlling and characterizing uncertainty in weighing collected aerosols
• ISO 18158 Workplace air — Terminology
• ISO 24095 Workplace air - Guidance for the measurement of respirable crystalline silica*， 2021-08-31 Update
• ISO 3534-1 Statistics — Vocabulary and symbols — Part 1: General statistical terms and terms used in probability
• ISO 7708 Air quality - Particle size fraction definitions for health-related sampling
• ISO/IEC 17025 General requirements for the competence of testing and calibration laboratories [Standard in French]

ASTM D7948-20 history

• 2020 ASTM D7948-20 Standard Test Method for Measurement of Respirable Crystalline Silica in Workplace Air by Infrared Spectrometry
• 2014 ASTM D7948-14e1 Standard Test Method for Measurement of Respirable Crystalline Silica in Workplace Air by Infrared Spectrometry
• 2014 ASTM D7948-14 Standard Test Method for Measurement of Respirable Crystalline Silica in Workplace Air by Infrared Spectrometry