1、Designation:D714405a(Reapproved 2011)Standard Practice forCollection of Surface Dust by Micro-vacuum Sampling forSubsequent Metals Determination1This standard is issued under the fixed designation D7144;the number immediately following the designation indicates the year oforiginal adoption or,in the
2、 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 practice covers the micro-vacuum collection ofsurface dust for subsequent determination
3、of metals.Theprimary intended application is for sampling from soft,rough,or porous surfaces.1.2 Micro-vacuum sampling is carried out using a collectionnozzle attached to a filter holder(sampling cassette)that isconnected to an air sampling pump.1.3 This practice allows for the subsequent determinat
4、ion ofmetals on a loading basis(mass of metal(s)per unit areasampled),or on a concentration basis(mass of metal(s)per unitmass of sample collected),or both.1.4 The values stated in SI units are to be regarded asstandard.1.5 LimitationsDue to a number of physical factors inher-ent in the micro-vacuum
5、 sampling method,analytical resultsfor vacuum dust samples are not likely to reflect the total dustcontained within the sampling area prior to sample collection.Indeed,dust collection will generally be biased towardssmaller,less dense dust particles.Nevertheless,the use of thisstandard practice will
6、 generate data that are consistent andcomparable between operators performing micro-vacuum col-lection at a variety of sampling locations and sites.21.6 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 stan
7、dard 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:3D1356 Terminology Relating to Sampling and Analysis ofAtmospheresD3195 Practice for Rotameter CalibrationD4840 Guide for Sample
8、 Chain-of-Custody ProceduresD5438 Practice for Collection of Floor Dust for ChemicalAnalysisD6966 Practice for Collection of Settled Dust SamplesUsing Wipe Sampling Methods for Subsequent Determi-nation of Metals2.2 ISO Standard:4ISO 15202-1 Workplace airDetermination of metals andmetalloids in airb
9、orne particulate matter by inductivelycoupled plasma atomic emission spectrometryPart 1:Sampling3.Terminology3.1 DefinitionsFor definitions of terms relating to sam-pling and analysis of dust not given here,refer to D1356.3.2 Definitions of Terms Specific to This Standard:3.2.1 air sampling pumpa po
10、rtable pump that is used todraw air through a filter holder/collection nozzle assembly formicro-vacuum collection of surface dust.An example wouldinclude a personal sampling pump(D1356).3.2.2 batcha group of field or quality control samples,orboth,that are collected together in a similar environment
11、 andare processed together using the same reagents and equipment.3.2.3 collection nozzlea piece of flexible plastic tubing cutat a 45 angle at the inlet end,and connected at the outlet endto the inlet orifice of a filter holder(sampling cassette).3.2.4 field blanka sample that is handled in exactly
12、thesame way that field samples are collected,except that no air isdrawn through it.1This practice is under the jurisdiction ofASTM Committee D22 on Air Qualityand is the direct responsibility of Subcommittee D22.04 on Workplace Air Quality.Current edition approved March 1,2011.Published March 2011.O
13、riginallyapproved in 2005.Last previous edition approved in 2005 as D7144 05a.DOI:10.1520/D7144-05AR11.2Reynolds,S.J.,et al.,“Laboratory comparison of vacuum,OSHA,and HUDsampling methods for lead in household dust.”American Industrial HygieneAssociation Journal,Vol.58,pp.439-446(1997).3For reference
14、d 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.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Fl
15、oor,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 3.2.5 filter holderan apparatus that supports and containsthe filter medium upon which dust is collected.It is also oftenreferred to as a sampling ca
16、ssette.3.2.6 internal capsulea device inserted into a filter holder(sampling cassette)that allows complete capture of contami-nant within its envelope and prevents deposition of collectedmaterial on the internal walls of the sampling cassette.Use ofan internal capsule is necessary for gravimetric analysispurposes.NOTE1Such capsules are commercially available.3.2.7 sampling device(assembly)for micro-vacuumsampling,an apparatus consisting of the collection nozzle,filter holder(containing internal
