ASTM_C_1347_-_08_2014e1.pdf

Designation:C134708(Reapproved 2014)1Standard Practice forPreparation and Dissolution of Uranium Materials forAnalysis1This standard is issued under the fixed designation C1347;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.1NOTEEditorially relocated warning statement in 8.2.2 in June 2014.1.Scope1.1 This practice covers dissolution treatments for uraniummaterials that are applicable to the test methods used forcharacterizing these materials for uranium elemental,isotopic,and impurities determinations.Dissolution treatments for themajor uranium materials assayed for uranium or analyzed forother components are listed.1.2 The treatments,in order of presentation,are as follows:Procedure TitleSectionDissolution of Uranium Metal and Oxide with Nitric Acid8.1Dissolution of Uranium Oxides with Nitric Acid and ResidueTreatment8.2Dissolution of Uranium-Aluminum Alloys in Hydrochloric Acidwith Residue Treatment8.3Dissolution of Uranium Scrap and Ash by Leaching with NitricAcid and Treatment of Residue by Carbonate Fusion8.4Dissolution of Refractory Uranium-Containing Material byCarbonate Fusion8.5Dissolution of UraniumAluminum AlloysUranium Scrap and Ash,and RefractoryUranium-Containing Materials byMicrowave Treatment8.61.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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.Specific hazardsstatements are given in Section 7.2.Referenced Documents2.1 ASTM Standards:2C753 Specification for Nuclear-Grade,Sinterable UraniumDioxide PowderC776 Specification for Sintered Uranium Dioxide PelletsC1168 Practice for Preparation and Dissolution of PlutoniumMaterials for AnalysisD1193 Specification for Reagent Water3.Summary of Practice3.1 Many uranium-containing materials such as high-puritymetals and oxides dissolve readily in various mineral acids.The dissolution of uranium-plutonium mixed oxides is coveredin Practice C1168.Highly refractory materials require priorgrinding of samples and fusions to affect even partial dissolu-tion.Combinations of the mineral acid and fusion techniquesare used for difficult to dissolve materials.3,4,5Alternatively,thecombination of acids and a high pressure microwave have beenfound to be effective with more difficult to dissolve materialsand can also be used for materials which dissolve in mineralacid in place of heating with a steam bath or hot plate.3.2 The dissolved materials are quantitatively transferred totared polyethylene bottles for subsequent sample solution massdetermination and factor calculation.Aliquants are obtained bymass for high-precision analysis or by volume for less preciseanalysis methods.Quantitative transfers of samples and sub-sequent solutions are required.The sample is rejected when-ever a loss is incurred,or even suspected.1This practice is under the jurisdiction of ASTM Committee C26 on NuclearFuel Cycle and is the direct responsibility of Subcommittee C26.05 on Methods ofTest.Current edition approved June 1,2014.Published June 2014.Originallyapproved in 1996.Last previous edition approved in 2008 as C1347 08.DOI:10.1520/C1347-08R14E01.2For 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.3Selected Measurement Methods for Plutonium and Uranium in the NuclearFuel Cycle,Second Edition,C.J.Rodden,ed.,U.S.Atomic Energy Commission,1972.4Analysis of Essential Nuclear Reactor Materials,C.J.Rodden,ed.,U.S.Atomic Energy Commission,1964.5Larsen,R.P.,“Dissolution of Uranium Metal and Its Alloys,”AnalyticalChemistry,Vol 31,No.4,1959,pp.545549.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.3 Solutions of dissolved samples are inspected for undis-solved particles.Further treatment is necessary to attain com-plete solubility if particles are present.When analyzing thedissolved sample for trace impurities,caution should beexercised so the dissolution process does not cause the impu-rity to be lost or does not increase the level of impurity beingdetermined significantly.NOTE1The use of double distilled acids may be necessary for lowlevel trace impurities.The use of plastic labware will be necessary so thedissolution does not increase the level of impurities being determined.This may be necessary in Section 8.6.3.4 These dissolution procedures are written for