ASTM_C_791_-_19.pdf

Designation:C79119Standard Test Methods forChemical,Mass Spectrometric,and SpectrochemicalAnalysis of Nuclear-Grade Boron Carbide1This standard is issued under the fixed designation C791;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 These test methods cover procedures for the chemical,mass spectrometric,and spectrochemical analysis of nuclear-grade boron carbide powder and pellets to determine compli-ance with specifications.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.3 The analytical procedures appear in the following order:SectionsTotal Carbon by Combustion in an Inductive Furnace andInfrared Measurement8 17Total Boron by Titrimetry and ICP OES18 28Isotopic Composition by Mass Spectrometry29 33Pyrohydrolysis34 41Chloride by Constant-Current Coulometry42 50Chloride and Fluoride by Ion-Selective Electrode51 59Water by Constant-Voltage Coulometry and Weight Loss onDrying60 63Metallic Impurities by DCArc OES and wet chemical meth-ods64 and 65Soluble Boron by Titrimetry and ICP OES66 80Free Carbon by a Coulometric Method81 901.4 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.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 Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C750 Specification for Nuclear-Grade Boron Carbide Pow-derC751 Specification for Nuclear-Grade Boron Carbide PelletsC859 Terminology Relating to Nuclear MaterialsC1128 Guide for Preparation of Working Reference Materi-als for Use in Analysis of Nuclear Fuel Cycle MaterialsD1193 Specification for Reagent WaterE969 Specification for Glass Volumetric(Transfer)Pipets3.Terminology3.1 DefinitionsFor definitions of terms relating to nuclearmaterials,refer to Terminology C859.3.2 Definitions of Terms Specific to This Standard:3.2.1 analytethe constituent determined by a chemicalmeasurement process.3.2.2 analytical or emission linethe particular wavelengthof electromagnetic radiation used in determining the presenceor concentration of an element.3.2.3 backgroundspectral intensity that would be mea-sured at the wavelength of the emission line if the emission andoverlapping lines were not present.3.2.4 calibrationthe act,process,or result of establishingthe relationship between the response of an instrument and theamount of analyte present.3.2.5 calibration functionthe graphical or mathematicalrepresentation of the relationship between the response of aninstrument and the concentration or mass of the analyte.3.2.6 calibration samples or solutionssamples or solu-tions with known analyte contents or analyte concentrations,respectively,to establish the relationship between the responseof an instrument and the amount of analyte.1These test methods are under the jurisdiction of ASTM Committee C26 onNuclear Fuel Cycle and are the direct responsibility of Subcommittee C26.03 onNeutron Absorber Materials Specifications.Current edition approved Feb.1,2019.Published March 2019.Originallyapproved in 1975.Last previous edition approved in 2012 as C791 12.DOI:10.1520/C0791-19.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,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 3.2.7 certified reference material(CRM)a referencematerial,accompanied by a certificate,one or more of whoseproperty values are certified by a procedure which establishestraceability to an accurate realization of the unit in which theproperty values are expressed,and for which each certifiedvalue is accompanied by an uncertainty at a stated level ofconfidence.3.2.8 DCArc OESoptical emission spectrometry(OES)with direct current arc(DCArc)as excitation source.3.2.9 drift correctionthe process of adjusting for a shift of