ASTM_C_760_-_90_2015.pdf

Designation:C76090(Reapproved 2015)Standard Test Methods forChemical and Spectrochemical Analysis of Nuclear-GradeSilver-Indium-Cadmium Alloys1This standard is issued under the fixed designation C760;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 chemicaland spectrochemical analysis of nuclear grade silver-indium-cadmium(Ag-In-Cd)alloys to determine compliance withspecifications.1.2 The analytical procedures appear in the following order:SectionsSilver,Indium,and Cadmium by a Titration Method7 15Trace Impurities by Carrier-Distillation Spectro-chemical Method16 221.3 The values stated in SI units are to be regarded as thestandard.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 and health practices and determine the applica-bility of regulatory limitations prior to use.For specific hazardand precautionary statements,see Section 5 and Practices E50.2.Referenced Documents2.1 ASTM Standards:2C752 Specification for Nuclear-Grade Silver-Indium-Cadmium AlloyD1193 Specification for Reagent WaterE50 Practices for Apparatus,Reagents,and Safety Consid-erations for Chemical Analysis of Metals,Ores,andRelated MaterialsE115 Practice for Photographic Processing in Optical Emis-sion Spectrographic Analysis(Withdrawn 2002)32.2 Other Document:NBS Circular 60243.Significance and Use3.1 Silver-indium-cadmium alloy is used as a control mate-rial in nuclear reactors.In order to be suitable for this purpose,the material must meet the specifications for assay and impu-rity content.These test methods are designed to show whetheror not a given material meets the specifications as given inSpecification C752.3.1.1 An assay is performed to determine whether thematerial has the chemical composition specified.3.1.2 The impurity content is determined to ensure that themaximum concentration limit of impurities is not exceeded.4.Purity of Reagents4.1 Reagent grade chemicals shall be used in all tests.Unless otherwise indicated,it is intended that all reagents shallconform to the specifications of the Committee on AnalyticalReagents of the American Chemical Society,5where suchspecifications are available.Other grades may be used,pro-vided it is first ascertained that the reagent is of sufficientlyhigh purity to permit its use without lessening the accuracy ofthe determination.4.2 Purity of WaterUnless otherwise indicated,referencesto water shall be understood to mean reagent water conformingto Specification D1193.5.Hazards5.1 Proper precautions should be taken to prevent inhalationor ingestion of heavy element(silver,indium,or cadmium)powder or dust during handling.5.2 Workers should observe precautions as specified invendor-supplied Material Safety Data Sheets(MSDS).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 Jan.1,2015.Published January 2015.Originallyapproved in 1971.Last previous edition approved in 2007 as C760 90(2007).DOI:10.1520/C0760-90R15.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from National Institute of Standards and Technology(NIST),100Bureau Dr.,Stop 1070,Gaithersburg,MD 20899-1070,http:/www.nist.gov.5Reagent Chemicals,American Chemical Society Specifications,AmericanChemical Society,Washington,DC.For suggestions on the testing of reagents notlisted by the American Chemical Society,see Analar Standards for LaboratoryChemicals,BDH Ltd.,Poole,Dorset,U.K.and the United States Pharmacopeia andNational Formulary,U.S.Pharmacopeial Convention,Inc.(USPC),Rockville,MD.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.Sampling6.1 Suggestions for sampling this alloy are given in Speci-fication C752.SILVER,INDIUM,AND CADMIUM BY A TITRATIONMETHOD7.Scope7.1 This test method is applicable to the determination ofsilver,indium,and cadmium in alloys of approximately 80%silver,15%indium,and 5%cadmium used in nuclear reactorcontrol rod applications.The titrimetric methods presented6,7will yield results with a bias of the order of 0.1%.8.Summary of Test Method8.1 A weighed sample is dissolved in nitric acid and dilutedto a known volume,and aliquots are removed for analysis.Silver is determined first by