1、Designation:D678520Standard Test Method forDetermination of Lead in Workplace Air Using Flame orGraphite Furnace Atomic Absorption Spectrometry1This standard is issued under the fixed designation D6785;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 standard specifies flame and graphite furnaceatomic absorption spectrometric methods for
3、the determinationof the time-weighted average mass concentration of particulatelead and lead compounds in workplace air.1.2 The method is applicable to personal sampling of theinhalable fraction of airborne particles,as defined in ISO 7708,and to static(area)sampling.1.3 The sample dissolution proce
4、dure specifies hot plate ormicrowave digestion,or ultrasonic extraction(10.2).Thesample dissolution procedure is not effective for all leadcompounds(see Section 5).The use of an alternative,morevigorous dissolution procedure is necessary when it is desiredto extract lead from compounds present in th
5、e test atmospherethat are insoluble using the dissolution procedures describedherein.For example if it is desired to determine silicate lead,ahydrofluoric acid dissolution procedure is required.1.4 The flame atomic absorption method is applicable to thedetermination of masses of approximately 1 to 2
6、00 g of leadper sample,without dilution(1).2The graphite furnace atomicabsorption method is applicable to the determination of massesof approximately 0.01 to 0.5 g of lead per sample,withoutdilution(1).1.5 The ultrasonic extraction procedure has been validatedfor the determination of masses of appro
7、ximately 20 to 100 gof lead per sample,for laboratory-generated lead fume air filtersamples(2).1.6 The concentration range for lead in air for which thisprocedure is applicable is determined in part by the samplingprocedure selected by the user(see Section 9).1.7 Anions that form precipitates with l
8、ead may interfere,but this potential interference is overcome by the addition ofthe disodium salt of ethylenediamine tetraacetic acid(EDTA)when necessary.1.8 The values stated in SI units are to be regarded as thestandard.No other units of measurement are included in thisstandard.1.9 This standard d
9、oes 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 the applicability of regulatory limitations prior to use.1.10 This international
10、 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 issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.
11、Referenced Documents2.1 ASTM Standards:3D1193 Specification for Reagent WaterD1356 Terminology Relating to Sampling and Analysis ofAtmospheresD3195 Practice for Rotameter CalibrationD4840 Guide for Sample Chain-of-Custody ProceduresD5337 Practice for Flow Rate Adjustment of Personal Sam-pling PumpsE
12、882 Guide for Accountability and Quality Control in theChemical Analysis LaboratoryE1370 Guide for Air Sampling Strategies for Worker andWorkplace ProtectionE1792 Specification for Wipe Sampling Materials for Leadin Surface Dust2.2 Other Standards:4ISO 648 Laboratory GlasswareOne-Mark Pipettes1This
13、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 March 1,2020.Published May 2020.Originallyapproved in 2002.Last previous edition approved in 2013 as D6785 13.DOI:10.1520
14、/D6785-20.2The boldface numbers in parentheses refer to the list of references at the end ofthis standard.3For 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 D
15、ocument Summary page onthe ASTM website.4Available 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 StatesThis international standard was
16、 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 Barriers to Trade(TBT)Committee.ISO 1042 Laboratory GlasswareOne-Mark VolumetricFlasksISO 3534-1 StatisticsVocabulary and SymbolsPart 1:General Statistical Terms and Terms Used in ProbabilityISO 3585 Glass Plant,Pipelines and FittingsProperties ofBo
