1、Designation: C1508 01 (Reapproved 2011)Standard Test Method forDetermination of Bromine and Chlorine in UF6and UranylNitrate by X-Ray Fluorescence (XRF) Spectroscopy1This standard is issued under the fixed designation C1508; the number immediately following the designation indicates the year oforigi
2、nal 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
3、 (Cl) in uranium hexafluoride (UF6) and uranylnitrate solution. The method as written covers the determina-tion of bromine in UF6over the concentration range of 0.2 to8 g/g, uranium basis. The chlorine in UF6can be determinedover the range of 4 to 160 g/g, uranium basis. Higherconcentrations may be
4、covered by appropriate dilutions. Thedetection limit for Br is 0.2 g/g uranium basis and for Cl is 4g/g uranium basis.1.2 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
5、 isthe responsibility of the user of this standard to establishappropriate safety and health practices and determine theapplicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C761 Test Methods for Chemical, Mass Spectrometric,Spectrochemical, Nuclear, and Rad
6、iochemical Analysis ofUranium HexafluorideC787 Specification for Uranium Hexafluoride for Enrich-mentC788 Specification for Nuclear-Grade Uranyl Nitrate Solu-tion or CrystalsC1118 Guide for Selecting Components for Wavelength-Dispersive X-Ray Fluorescence (XRF) SystemsD1193 Specification for Reagent
7、 Water3. Summary of Test Method3.1 A sample of hydrolyzed UF6(uranyl fluoride) 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. S
8、pike recoveries can be improved by theaddition of potassium iodide causing coprecipitation of thehalides. The halides are collected on filter paper and areanalyzed by X-ray fluorescence using two different crystal/detector systems.4. Significance and Use4.1 The method is designed to show whether or
9、not thetested materials meet the specifications as given in Specifica-tions C787 and C788.5. Interferences5.1 Plastic equipment must be used throughout the methodfor uranyl fluoride as the hydrofluoric acid in the uranylfluoride leaches chloride from glassware causing a high bias.5.2 Low recoveries
10、may occur as the precipitate can bedifficult to transfer quantitatively to the filter paper. A surfac-tant can be added (optional step) to minimize the adhesion ofthe precipitate to the walls of the beakers and the funnel.6. Apparatus6.1 X-Ray Spectrometer, see Guide C1118 for the selectionof the X-
11、ray Spectrometer.6.2 Plastic Vacuum Filtration Apparatus, for 47 mm diam-eter filter paper.6.3 Filter Paper, 0.45 micron, 47 mm diameter.36.4 Beakers, polypropylene, 250 mL.6.5 Stirring Rods, plastic or Teflon.6.6 X-ray Sample Support, Rings. Inner diameter approxi-mately 40 mm.1This test method is
12、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, 2011. Published June 2011. Originallyapproved in 2001. Last previous edition approved in 2006 as C1508 01(2006).DOI: 10.1520/C1
13、508-01R1.2For 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 filter must be Cl and Br free. Millipore membra
14、ne filter type HABP() has been successfully used. An alternate is 15A from S.C.B,BP6, RN86, 07130 Soyons France. Any other equivalent is acceptable.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7. Reagents7.1 Purity of ReagentsReag
15、ent grade chemicals shall beused in all tests. Unless otherwise indicated, it is intended thatall reagents conform to the specifications of the Committee onAnalytical Reagents of the American Chemical Society, wheresuch specifications are available.4Other grades may be used,provided it is first asce
16、rtained that the reagent is of sufficientlyhigh purity to permit its use without lessening the accuracy ofthe determination.7.2 Purity of WaterUnless otherwise indicated, referencesto water shall be understood to mean reagent water conformingto Specification D1193, Type I.7.3 Ammonium Hydroxide,NH4O
17、H, concentrated, specificgravity 0.90.7.4 Ammonium Hydroxide Solution, 1 + 3 (3.7 M). Dilute 1part NH4OH with 3 parts water.7.5 Surfactant, bromine and chlorine free.5(Optional).7.6 Surfactant Solution, 1 + 999. Add 1 mL of surfactant toapproximately 1 litre of water. (Optional).7.7 Nitric Acid, HNO
18、3, concentrated, specific gravity 1.42.7.8 Nitric Acid Solution, 1 + 999 (0.016 M). Add 1 mL ofconcentrated HNO3to approximately 200 mL of water. Add 1mL of the surfactant (7.6). (Optional). Dilute to 1 litre.7.9 Sodium Nitrite, NaNO2.7.10 Sodium Nitrite Solution, 2 g/L. Dissolve1gofsodiumnitrite in
19、 water and dilute to 500 mL. Prepare fresh immedi-ately before use.7.11 Silver Nitrate, AgNO3.7.12 Silver Nitrate Solution, 2 g/L. Dissolve2gofsilvernitrate in water and dilute to 1 litre. Keep away from light in anopaque bottle. The solution should be made fresh weekly.Silver is an RCRA listed haza
20、rdous waste. Make up only asmuch of this solution as required to minimize excess waste.7.13 Potassium Bromide, KBr.7.14 Bromide Solution, 500 mg Br/L. Dissolve 0.1861 g ofKBr (dried at 110C for 1 hour) in water and dilute to 250 mLin a volumetric flask.7.15 Sodium Chloride, NaCl.7.16 Sodium Chloride
21、 Solution, 1000 mg Cl/L. Dissolve1.648 g NaCl (dried at 110 C for 1 hour ) in water and diluteto 1 litre in a volumetric flask.7.17 Spike Solution, 5 mg Br/L, 100 mg Cl/L. Transfer 10mL of 500 mg Br /L solution into a 1 litre volumetric flask bypipette. Transfer 100 mL of 1000 mg Cl /L into the flas
22、k bypipette. Dilute to volume.7.18 Potassium Iodide, KI. (Optional).7.19 Potassium Iodide Solution, (Optional), 1g I/L. Dis-solve 0.131 g potassium iodide in water and dilute to 100 mL.The solution should be prepared weekly.8. Standard Preparation8.1 Pipette the following aliquots of spike solution
23、(from7.17) into polypropylene beakers. 0 mL, 1 mL, 2 mL, 5 mL, 10mL. The aliquots represent 0g Br, 5g Br, 10g Br, 25g Br,50g Br and 0g Cl, 100g Cl, 200g Cl, 500g Cl, 1000g Cl.8.2 Add 70 mL water to each beaker.8.3 Follow steps 9.3-9.8 at the same time as the samples.9. Procedure9.1 Transfer a known
24、aliquot of uranyl fluoride solution(prepared following Test Methods C761) or uranyl nitrate thatcontains a known amount of uranium, approximately 5 g, witha plastic graduated cylinder into a polypropylene beakercontaining 70 mL water.NOTE 1Recommend cleaning all laboratory equipment with ammo-nium h
25、ydroxide solution (7.4) prior to use.9.2 Follow laboratory QA practices and run the necessaryduplicates, spikes and controls with the samples. Use thesolution prepared in 7.17 for the spikes.NOTE 22 mL and 4 mL spike aliquots were found to be reasonablevolumes.9.3 Add 0.5 mL of potassium iodide solu
26、tion to each sampleand standard. (Optional step).9.4 Add 4 mL of surfactant solution 7.6. (Optional step).9.5 Add 10 mL of sodium nitrite solution to each sampleand standard. Stir each solution with a dedicated plastic stirringrod and allow to stand for a minimum of 2 minutes.9.6 Slowly and with sti
27、rring add 25 mL of the silver nitratesolution. Remove the plastic stirring rods. Heat the solution ina water bath at approximately 80C 6 10C for 112 hours.9.7 Remove from the bath. Allow the halides to precipitateovernight. A2 hour precipitation time has been found to besuccessful, but the user must
28、 establish precision and bias basedon the shorter time. The precision and bias data in this standardwere generated using an overnight precipitation.9.8 Filter using 0.45 micron filter paper. Use a plasticvacuum filtration assembly. Use a plastic rod with a rubberpoliceman to aid the transfer of prec
29、ipitate to the filter. Use 1+ 999 nitric acid solution to wash the precipitate. Dry the filtersbefore counting in the X-ray.9.9 Place the filters on X-ray sample support rings and tapeor glue in place.9.10 Analyze using the X-ray.4Reagent Chemicals, American Chemical Society Specifications, American
30、Chemical 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 Pharmacopeiaand National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC),
31、Rockville,MD.5Triton X-100, Rohm and Haas, has been successfully used.TABLE 1 Suggested X-Ray SettingsBromine ChlorineLine Ka KaCrystal LiF 200(Lithium fluoride)PE (Tetrakis(hydroxymethyl)-methane)Detector Scintillation FlowOrder 1 1X-ray tube Rhodium RhodiumTube voltage (kV) 45 45Tube Amperage (mA)
32、 45 75Counting Time (s) 40 40C1508 01 (2011)210. Instrument Calibration10.1 Follow the manufacturers instructions for setting upthe instrument to achieve an inert gas environment and toobtain the following instrument parameters. (See Table 1).10.2 Run the standards and construct a calibration curveu
33、sing the instruments software or by manually plotting thecurve using linear chart paper.10.3 Run the samples. Determine the weight of Br and Clpresent on the filter papers from the calibration curves.Calculate the concentration of Br and Cl in the samples byfollowing Section 11.11. Calculation11.1 C
34、alculate the halide content as follows:Halide, g/g uranium basis 5A 3 1000B 3 Cwhere:A = micrograms halide from the calibration curve,1000 = conversion factor, litres to millilitres,B = sample aliquot from 9.1, in millitres, andC = uranium concentration of sample solution, in g/L.12. Precision and B
35、ias12.1 Uranium Hexafluoride Data:12.1.1 Precision in UF6SamplesThe single laboratoryprecision for the average of multiple determinations is given inTable 2. The data for laboratory A were collected using arhodium X-ray tube and a LiF200 crystal for bromine and a PEcrystal for chlorine. Potassium io
36、dide (optional 9.3) was addedto the samples in laboratory A. The results were obtained overa 3 month period by two technicians. The results for laboratoryB was obtained by 1 technician over a 1 year period. Potassiumiodide was not added to Laboratory B samples. The precisionis given in Table 2.12.1.
37、2 Bias in UF6SamplesNo standard material certifiedfor bromine and chlorine in UF6is available. Therefore biascannot be determined. To determine lower bound bias indica-tions uranyl fluoride solutions were spiked with NIST SRM.The uncertainty of the NIST traceable standard is less than theuncertainty
38、 of the procedure. The data for Laboratory A werecollected over a 3 month period by two technicians. Potassiumiodide was added to laboratory A samples. The result data forLaboratory B were obtained over a 1 year period by 1technician. No potassium iodide was added to laboratory Bsamples. The mean mi
39、nus the prepared values are an indicationof the bias. The relative differences are given in Table 3. Therelative difference is (mean-known)/known 3 100 %.12.2 Uranyl Nitrate Data:12.2.1 Precision in Uranyl Nitrate SamplesThe resultdata were collected in 1 day by 1 technician. The precision isgiven i
40、n Table 4. No potassium iodide (optional 9.3) was addedto the uranyl nitrate samples.12.2.2 Bias in Uranyl Nitrate SamplesThe bias should beequivalent to the bias in UF6samples.12.3 The supporting data for Tables 2-4 are available fromASTM headquarters.13. Keywords13.1 bromine; chlorine; uranium hex
41、afluoride; X-ray fluo-rescence; XRFTABLE 2 Within Laboratory Precision For UF6Laboratory HalideConcentration(g halide/g U)Standard Deviation(g halide/g U)Number ofDeterminationsA Bromine 0.44 0.06 10A Bromine 3.1 0.2 9B Bromine 5.1 0.7 109A Chlorine 2.4 2.1 9A Chlorine 66 6 8A Chlorine 185 19 9B Chl
42、orine 48 5 107TABLE 3 Bias Estimates For UF6Laboratory Halide Spike Concentration(g halide/g U)Spike(g halide)Mean(g halide)Bias Estimate Relative Difference Number of DeterminationsA Bromine 2 10 10.6 +0.6 +6 % 10A Bromine 4 20 20.5 +0.5 +2.5 % 10B Bromine 5 25 25.5 +0.5 +2 % 109A Chlorine 40 200 2
43、13 +13 +6.5 % 10A Chlorine 80 400 450 +50 +12.5 % 10B Chlorine 50 250 238 12 6 % 107C1508 01 (2011)3ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that dete
44、rmination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or
45、 withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel tha
46、t your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints
47、(single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).TABLE 4 Within Laboratory Precision For Uranyl NitrateSolutionsHalide Concentration(g halide/g U)StandardDeviationNumber ofDeterminationsBromine 10 1.5 3Bromine Blank 0.04 3Chlorine 50 9 3Chlorine Blank 0.5 3C1508 01 (2011)4
