1、Designation:D708504(Reapproved 2018)Standard Guide forDetermination of Chemical Elements in Fluid CatalyticCracking Catalysts by X-ray Fluorescence Spectrometry(XRF)1This standard is issued under the fixed designation D7085;the number immediately following the designation indicates the year oforigin
2、al 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 guide covers several comparable procedures for thequantitative chem
3、ical analysis of up to 29 elements in fluidcatalytic cracking(FCC)catalyst by X-ray fluorescence spec-trometry(XRF).Additional elements may be added.1.2 This guide is applicable to fresh FCC catalyst,equilib-rium FCC catalyst,spent FCC catalyst,and FCC catalyst fines.1.3 The values stated in SI unit
4、s are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3.1 The units of ppm(mg/kg)are used instead of wt%inTables X2.3-X2.5 for reporting concentration of certain ele-ments because of industry convention and because most ofthese elements are present at trace lev
5、els.1.4 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 the applicability of regulatory limitations prior to use.
6、1.5 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 issued by the World Trade Organization TechnicalBarriers to
7、Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C982 Guide for Selecting Components for Energy-Dispersive X-Ray Fluorescence(XRF)Systems(With-drawn 2008)3C1118 Guide for Selecting Components for Wavelength-Dispersive X-Ray Fluorescence(XRF)Systems(With-drawn 2011)3D1977 Test Method for
8、 Nickel and Vanadium in FCCEquilibrium Catalysts by Hydrofluoric/Sulfuric Acid De-composition and Atomic Spectroscopic AnalysisE1172 Practice for Describing and Specifying a WavelengthDispersive X-Ray SpectrometerE1361 Guide for Correction of Interelement Effects inX-Ray Spectrometric AnalysisE1621
9、Guide for Elemental Analysis by Wavelength Disper-sive X-Ray Fluorescence SpectrometryE1622 Practice for Correction of Spectral Line Overlap inWavelength-Dispersive X-Ray Spectrometry(Withdrawn2006)33.Summary of Guide3.1 The test specimen is prepared with a clean,uniform,flatsurface.Two commonly use
10、d test methods of preparing testspecimens are listed:briquetting a powder(Test Method A,Sections 8 15)and fusing a powder into a glass bead(TestMethod B,Sections 16 23).This surface of the fused orbriquetted specimen is irradiated with a primary source of Xrays.The secondary X rays produced in the s
11、pecimen arecharacteristic of the chemical elements present in the speci-men.Two types of XRF instrumentation may be used to collectand process the X-ray spectra.Using a wavelength-dispersiveX-ray spectrometer,the secondary X rays produced in thespecimen are dispersed according to their wavelength by
12、means of crystals or synthetic multilayers.The X-ray intensi-ties are measured by detectors set at selected wavelengths andrecorded as counts(number of X rays impinging on thedetector per unit time).Concentrations of the elements aredetermined from the measured intensities using calibrationcurves pr
13、epared from suitable reference materials.Using anenergy-dispersive X-ray spectrometer,the secondary X rays1This guide is under the jurisdiction of ASTM Committee D32 on Catalysts andis the direct responsibility of Subcommittee D32.03 on Chemical Composition.Current edition approved Nov.1,2018.Publis
14、hed December 2018.Originallyapproved in 2004.Last previous edition approved in 2010 as D7085 04(2010)1.DOI:10.1520/D7085-04R18.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,ref
15、er to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in ac
16、cordance 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 produced in the specimen are sent to a detector where the entireX-ray spectrum is electronically sorted according to the X-rayenergy and processed into counts using a multichannel ana-lyzer.The principal advantages of the wavelengt
