1、Designation:D492221Standard Test Method forDetermination of Radioactive Iron in Water1This standard is issued under the fixed designation D4922;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 par
2、entheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of55Fe in thepresence of59Fe by liquid scintillation counting.The a-prioriminimum detectable concentration for
3、 this test method is 7.4Bq/L.21.2 This test method was developed principally for thequantitative determination of55Fe.However,after proper cali-bration of the liquid scintillation counter with reference stan-dards of each nuclide,59Fe may also be quantified.1.3 This test method was used successfully
4、 with Type IIIreagent water conforming to Specification D1193.It is theresponsibility of the user to ensure the validity of this testmethod for waters of untested matrices.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility o
5、f 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.For a specific hazard statement,see Section 9.1.5 This international standard was developed in accor-dance with internationally reco
6、gnized 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:3D1068 Test Methods for I
7、ron in WaterD1129 Terminology Relating to WaterD1193 Specification for Reagent WaterD2777 Practice for Determination of Precision and Bias ofApplicable Test Methods of Committee D19 on WaterD3370 Practices for Sampling Water from Flowing ProcessStreamsD5847 Practice for Writing Quality Control Speci
8、ficationsfor Standard Test Methods for Water AnalysisD7282 Practice for Setup,Calibration,and Quality Controlof Instruments Used for Radioactivity MeasurementsD7902 Terminology for Radiochemical Analyses3.Terminology3.1 DefinitionsFor definitions of terms used in this testmethod,refer to Terminologi
9、es D1129 and D7902.For termsnot defined in this test method or in Terminologies D1129 orD7902,refer to other published glossaries.44.Summary of Test Method4.1 This test method describes the effective separation ofiron from the interfering cations of manganese,cobalt,zirconium,niobium,and cesium by a
10、nion exchange using acidwashes of various molarities.Subsequent elution of the iron isfollowed by phosphate precipitation to remove any residualzinc.The iron phosphate precipitate is dissolved in phosphoricacid and water and mixed with liquid scintillation cocktail.Thechemical yield is determined by
11、 the recovery of iron carrierusing atomic absorption spectrophotometry.Alternatively,anyprocedure described in Test Methods D1068 may be used,butthis will need to be validated by the user prior to reportingsample results.5.Significance and Use5.1 Fe-55 is formed in reactor coolant systems of nuclear
12、reactors by activation of stable iron.The55Fe is not completelyremoved by waste processing systems and some is released tothe environment by means of normal waste liquid discharges.Power plants are required to monitor these discharges for55Feas well as other radionuclides.5.2 This technique effectiv
13、ely removes other activation andfission products such as isotopes of iodine,zinc,manganese,1This test method is under the jurisdiction of ASTM Committee D19 on Waterand is the direct responsibility of Subcommittee D19.04 on Methods of Radiochemi-cal Analysis.Current edition approved Dec.15,2021.Publ
14、ished May 2022.Originallyapproved in 1989.Last previous edition approved in 2016 as D4922 09(2016)1.DOI:10.1520/D4922-21.2Currie,L.,“Limits for Qualitative Detection and Quantitative Determination,”Analytical Chemistry,Vol.40,1968,pp.586593.3For referenced ASTM standards,visit the ASTM website,www.a
15、stm.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.4“American National Standard Glossary of Terms,”Nuclear Science andTechnology(ANSI N1.1),American National Standards Institut
16、e,1430 Broadway,New York,NY 10018.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.1cobalt,and cesium by the addition of hold-b
