1、Designation:C184216Standard Test Method forThe Analysis of Boron and Silicon in Uranium Hexfluoridevia Fourier-Transform Infrared(FTIR)Spectroscopy1This standard is issued under the fixed designation C1842;the number immediately following the designation indicates the year oforiginal adoption or,in
2、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 is suitable for determining boron andsilicon impurities as BF3and SiF4in
3、uranium hexafluoride.This test method is an alternative to those described in TestMethods C761 and C1771.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns,
4、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.2.Referenced Documents2.1 ASTM Standards:2C761 Test Methods for Chemical,Mass Spectrometri
5、c,Spectrochemical,Nuclear,and Radiochemical Analysis ofUranium HexafluorideC787 Specification for Uranium Hexafluoride for Enrich-mentC859 Terminology Relating to Nuclear MaterialsC996 Specification for Uranium Hexafluoride Enriched toLess Than 5%235UC1052 Practice for Bulk Sampling of Liquid Uraniu
6、mHexafluorideC1703 PracticeforSamplingofGaseousUraniumHexafluorideC1771 Test Method for Determination of Boron,Silicon,and Technetium in Hydrolyzed Uranium Hexafluoride byInductively Coupled PlasmaMass Spectrometer AfterRemoval of Uranium by Solid Phase Extraction2.2 Other Documents:ANSIN14.1 Nuclea
7、rMaterials UraniumHexfluo-ride Packaging for Transport3ISO7195 NuclearEnergy PackagingofUraniumHexafluoride(UF6)for Transport43.Terminology3.1 Except as otherwise defined herein,definitions of termsare as given in Terminology C859.3.2 Definitions of Terms Specific to This Standard:3.2.1 detection li
8、mit,nbased on the minimum absorbanceobtainable at a given pressure to yield a meaningful result.Inaccordance with Terminology C859,a low concentration levelcould be achieved with these methods.3.2.2 FTIR,nFourier-transform infrared spectroscopy.3.2.3 K,ninfrared absorbance constant in pressure units
9、1/Pa,K=OD/Pressure.3.2.4“1S”container,na nickel or Monel container asdescribed in ANSI N14.1.4.Summary of Test Method4.1 To perform the Fourier-Transform Infrared(FTIR)spec-troscopic analysis of boron and silicon impurities in uraniumhexafluoride,a sample must be collected in a“1S”container orequiva
10、lent with the methods described in Practices C1052 orC1703.4.2 The bottle is kept at room temperature.The manifoldand the sample cell are maintained at 50C.In these conditions,UF6is mainly in solid phase in the bottle and boron and siliconare present in the gaseous phase of manifold.In this medium,t
11、he boron and silicon chemical forms are respectively BF3andSiF4.4.3 The test method is based on the analysis in the gasphase.The gas phase is analyzed at 50C by FTIR spectrom-etry to determine the B and Si concentration in uraniumhexafluoride.1This test method is under the jurisdiction ofASTM Commit
12、tee C26 on NuclearFuel Cycle and is the direct responsibility of Subcommittee C26.05 on Methods ofTest.Current edition approved June 1,2016.Published July 2016.DOI:10.1520/C1842-16.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.F
13、or Annual Book 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.4Available from International Organization for Standardization(I
14、SO),ISOCentral Secretariat,BIBC II,Chemin de Blandonnet 8,CP 401,1214 Vernier,Geneva,Switzerland,http:/www.iso.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.4 The manifold and sample cell are filled at the vaporpressure of UF6at r
15、oom temperature(near 12 kPa).4.5 After a screening,if the spectrum is the UF6spectrum,this test method can be used to check the compliance of UF6asspecified in Specifications C787 and C996.4.6 The boron and silicon determinations are done on thegaseous phase.The concentration and the limits of detec
16、tionare in units of g/g U.4.7 There are no spectral interferences from uraniumhexafluorides infrared absorbences.5.Significance and Use5.1 This test method utilizes FTIR spectroscopy to deter-mine the boron and silicon concentration in uranium hexafluo-ride.5.2 These detection limits are low and very effective tocheck the compliance of UF6with Specifications C787 andC996.6.Hazards6.1 Uranium hexafluoride is a hazardous material.It is ahighly reactive and toxic substance in addition to its radioa
