1、Designation:D794820Standard Test Method forMeasurement of Respirable Crystalline Silica in WorkplaceAir by Infrared Spectrometry1This standard is issued under the fixed designation D7948;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revisio
2、n,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This standard specifies a test method for collection andanalysis of samples of airborne particulate matter fo
3、r measure-ment of respirable crystalline silica by infrared(IR)spectrom-etry.1.2 This test method is applicable to the analysis of crystal-line silica(the polymorphs quartz,cristobalite and tridymite)over a working range of 0.025 to 0.4 mg/m3for a 400 L airsample or 0.02 to 0.25 mg/m3for a 1000 L ai
4、r sample,depending on the analytical method.1.3 The methodology is applicable to personal sampling ofthe respirable fraction of airborne particles and to static(area)sampling.1.4 This test method describes three different procedures forsample preparation and infrared analysis of airborne crystalline
5、silica samples,which are delineated in Annex A1 Annex A3,respectively:(1)a potassium bromide(KBr)disc IR measure-ment method,(2)indirect IR analysis after redeposition onto afilter used for measurement,and(3)direct on-filter IR analysis.1.5 The values stated in SI units are to be regarded asstandard
6、.No other units of measurement are included in thisstandard.1.6 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine t
7、he applicability of regulatory limitations prior to use.1.7 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issu
8、ed by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1356 Terminology Relating to Sampling and Analysis ofAtmospheresD4532 Test Method for Respirable Dust in Workplace At-mospheres Using Cyclone SamplersD5337 Practice for Flow Rate Ad
9、justment of Personal Sam-pling PumpsD4840 Guide for Sample Chain-of-Custody ProceduresD6061 Practice for Evaluating the Performance of Respi-rable Aerosol SamplersE1370 Guide for Air Sampling Strategies for Worker andWorkplace Protection2.2 ISO Standards:3ISO 7708 Air quality Particle size fraction
10、definitions forhealth-related samplingISO 3534-1 Statistics Vocabulary and symbols Part 1:Probability and general statistical terms in metrologyISO 13137 Workplace air Pumps for personal samplingof chemical and biological agents Requirements andtest methodsISO 15767 Workplace atmospheres Controlling
11、 and char-acterizing errors in weighing collected aerosolsISO/IEC 17025 General requirements for the competence oftesting and calibration laboratoriesISO 18158 Workplace air TerminologyISO 24095 Workplace air Guidance for the measurementof respirable crystalline silica3.Terminology3.1 Definitions:3.
12、1.1 For definitions of terms used in this test method,referto Terminology D1356.3.2 Definitions of Terms Specific to This Standard:1This test method is under the jurisdiction of ASTM Committee D22 on AirQuality and is the direct responsibility of Subcommittee D22.04 on Workplace AirQuality.Current e
13、dition approved March 1,2020.Published May 2020.Originallyapproved in 2014.Last previous edition approved in 2014 as D7948 141.DOI:10.1520/D7948-20.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards v
14、olume information,refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.Un
15、ited StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barrier
16、s to Trade(TBT)Committee.3.2.1 limit of quantification(LOQ),nlowest reliable massof crystalline silica that is quantifiable taking into considerationthe matrix effects in the sample.ISO 240953.2.2 limit value,nreference figure for concentration of achemical agent in air.ISO 181583.2.3 respirable crystalline silica(RCS),ninhaled par-ticles of crystalline silica that penetrate into the unciliatedairways.ISO 240953.2.4 respirable fraction,nmass fraction of inhaled par-ticles penetrating to the unci