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Designation: C1508 − 26Standard Test Method forDetermination of Bromine and Chlorine in UF 6 and UranylNitrate by X-Ray Fluorescence (XRF) Spectroscopy 1This standard is issued under the f i xed designation C1508; 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 This method covers the determination of bromine (Br)and chlorine (Cl) in uranium hexaf l uoride (UF 6 ) and uranylnitrate solution by X-ray f l uorescence (XRF) spectroscopy. Themethod as written covers the determination of bromine in UF 6over the mass fraction range of 0.2 µg⁄g to 8 µg⁄g, relative touranium. The chlorine in UF 6 can be determined over the massfraction range of 4 µg⁄g to 160 µg⁄g, relative to uranium.Higher concentrations may be covered by appropriate dilu-tions. The detection limit for Br is 0.2 µg/g relative to uraniumand for Cl is 4 µg/g relative to uranium.1.2 The values stated in SI units are to be regarded as thestandard. No other units of measurement are included in thisstandard.1.3 This standard may involve hazardous materials, opera-tions and equipment. This standard does not purport to addressall of the safety concerns, if any, associated with its use. It isthe responsibility of the user of this standard to establishappropriate safety, health, and environmental practices anddetermine the applicability of regulatory limitations prior touse.1.4 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: 2C761 Test Methods for Chemical, Mass Spectrometric,Spectrochemical, Nuclear, and Radiochemical Analysis ofUranium Hexaf l uorideC787 Specif i cation for Uranium Hexaf l uoride for Enrich-mentC788 Specif i cation for Nuclear-Grade Uranyl Nitrate Solu-tion or CrystalsC859 Terminology Relating to Nuclear MaterialsD1193 Specif i cation for Reagent Water3. Terminology3.1 Def i nitions:3.1.1 For def i nitions of terms relating to the nuclear fuelcycle, refer to Terminology C859.4. Summary of Test Method4.1 A sample of hydrolyzed UF 6 (uranyl f l uoride) or uranylnitrate solution is treated with sodium nitrite to reduce oxidizedforms of bromine and chlorine (bromates and chlorates) to theirrespective halide ions.Addition of silver nitrate precipitates thesilver halides. Spike recoveries can be improved by theaddition of potassium iodide causing coprecipitation of thehalides. The halides are collected on f i lter paper and areanalyzed by X-ray f l uorescence using two different crystal/detector systems.5. Signif i cance and Use5.1 The method is designed to determine whether or not thetested materials meet the specif i cations as given in Specif i ca-tions C787 and C788.6. Interferences6.1 Plastic equipment must be used throughout the methodfor uranyl f l uoride as the hydrof l uoric acid in the uranylf l uoride leaches chloride from glassware causing a high bias.6.2 Low recoveries may occur as the precipitate can bedifficult to transfer quantitatively to the f i lter paper. A surfac-tant can be added (optional step) to minimize the adhesion ofthe precipitate to the walls of the beakers and the funnel.7. Apparatus7.1 X-Ray Spectrometer, appropriate for the intended use.7.2 Plastic Vacuum Filtration Apparatus, for 47 mm diam-eter f i lter paper.1 This test method is under the jurisdiction ofASTM Committee C26 on NuclearFuel Cycle and is the direct responsibility of Subcommittee C26.05 on Methods ofTest.Current edition approved July 1, 2026. Published August 2026. Originallyapproved in 2001. Last previous edition approved in 2018 as C1508 – 18). DOI:10.1520/C1508-26.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at www.astm.org/contact. For Annual Book ofASTM Standards volume information, refer to the standard’s Document Summarypage on the 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