ASTM_D_7948_-_14.pdf

Designation:D794814Standard 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 revision,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 for 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 air 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 crystallinesilica 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.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 and health practices and determine the applica-bility of regulatory limitations prior to use.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 SamplersD4840 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 definitions forhealth-related samplingISO 3534-1 Statistics Vocabulary and symbols Part 1:Probability and general statistical terms in metrologyISO 6879 Air quality Performance characteristics andrelated concepts for air quality measuring methodsISO 13137 Workplace air Pumps for personal samplingof chemical and biological agents Requirements andtest methodsISO 15202-1 Workplace air Determination of metals andmetalloids in airborne particulate matter by inductivelycoupled plasma atomic emission spectrometry Part 1:SamplingISO 15767 Workplace atmospheres Controlling and char-acterizing errors in weighing collected aerosolsISO 24095 Workplace air Guidance for the measurementof respirable crystalline silica3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method,referto Terminology D1356.3.2 Definitions of General Terms Specific to This Standard:3.2.1 respirable crystalline silica(RCS),ninhaled par-ticles of crystalline silica that penetrate into the unciliatedairways.ISO 240953.2.2 chemicalagent,nanychemicalelementorcompound,on its own or admixed as it occurs in the naturalstate or as produced by any work activity,whether or notproduced intentionally and whether or not commercially avail-able.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 edition approved Oct.15,2014.Published February 2015.DOI:10.1520/D7948-14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume 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.United States1 3.2.3 breathing zone,n(general definition)space aroundthe workers face from where he or she takes his or her breath.EN 1540(1)4(technical definition)hemisphere(generally accepted to be0.3 m in radius)extending in front of the human face,centredon the midpoint of a line joining the ears;the base of thehemisphere is a plane through this line,the top of the head andthe larynx.ISO 15202-13.2.4 exposure(by inhalation),nsituation in which achemical agent is present in air which is inhaled by a person.EN 1540(1)3.2.5 limit value,nreference figure for concentration of achemical agent in air.EN 1540(1)3.2.6 measurement procedure,nset of operations,de-scribed specifically,for the sampling and analysis of chemicalagents in air.EN 1540(1)3.2.6.1 DiscussionA m