1、Designation:D818618Standard Test Method forMeasurement of Impurities in Graphite by ElectrothermalVaporization Inductively Coupled Plasma Optical EmissionSpectrometry(ETV-ICP OES)1This standard is issued under the fixed designation D8186;the number immediately following the designation indicates the
2、 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 test method covers the measurement of massfractions o
3、f the elements silver(Ag),aluminum(Al),arsenic(As),boron(B),barium(Ba),berylium(Be),bismuth(Bi),calcium(Ca),cadmium(Cd),cobalt(Co),chromium(Cr),copper(Cu),iron(Fe),potassium(K),lithium(Li),magnesium(Mg),manganese(Mn),molybdenum(Mo),sodium(Na),nickel(Ni),phosphorus(P),lead(Pb),sulfur(S),antimony(Sb),
4、silicon(Si),tin(Sn),strontium(Sr),titanium(Ti),vanadium(V),tungsten(W),yitrium(Y),zinc(Zn),andzirconium(Zr)in graphite.1.2 Provided that an appropriate validation procedure iscarried out,this test method is also applicable to other carbonmaterials such as coal,coke,carbon black,graphite-felt,graphit
5、e-foil,graphite-foam,and fiber reinforced carbon-carbon composites.1.3 This test method is applicable to element contents fromapproximately 0.0001 mg kg to 1000 mg kg(0.1 ppmw to1000 ppmw),depending on element,wavelength,measure-ment parameters,and sample mass.1.4 The values stated in SI units are t
6、o be regarded asstandard.The values given in parentheses after SI units areprovided for information only and are not considered standard.1.5 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 esta
7、blish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles f
8、or theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent Water2.2 ISO Standards:3ISO 5725-2 Accuracy(trueness and precision)of mea
9、sure-ment methods and resultsPart 2:Basic method for thedetermination of repeatability and reproducibility of astandard measurement method3.Terminology3.1 Definitions:3.1.1 ETV,nelectrothermal vaporization.3.1.2 ICP OES,ninductively coupled plasma opticalemission spectrometry.4.Summary of Test Metho
10、d4.1 The ETV unit consists of an electrically heated graphitetube furnace.Graphite boats which fit into the graphite tube areused for inserting the sample,crushed and milled if necessary,into the furnace.Handling of graphite boats is preferably doneusing an automated system.One end of the furnace,wh
11、ich issealed with a movable door,is used for inserting the graphiteboats(furnace inlet).The other end of the furnace(furnaceoutlet)is connected via a tube to the injector tube of theICP-torch.The graphite tube furnace is heated rapidly to atemperature where evaporation of analyte elements takes plac
12、e.For complete volatilization of analyte elements,a halogenatingreaction gas is added to the argon carrier gas stream.Theevaporation products containing the analyte elements aretransported as dry aerosol with the argon carrier gas streamfrom the furnace outlet to the ICP-torch where they are excited
13、to emit optical radiation.The emitted radiation is dispersed anddetected by a simultaneous spectrometer.The intensity ofradiation of emission lines and background(optional)is1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the
14、direct responsibility ofSubcommittee D02.F0 on Manufactured Carbon and Graphite Products.Current edition approved Oct.1,2018.Published December 2018.DOI:10.1520/D8186-18.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual B
15、ook 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 Conshoh
16、ocken,PA 19428-2959.United 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 Barriers to Trade(TBT)Committee.1 measured with appropriate detectors.The mass fractions of theanalyte elements are calculated by comparing the intensities ofthe element-specific spectr
