1、Designation:D650500(Reapproved 2022)Standard Test Method forAssay of normal-Propyl Bromide Content1This standard is issued under the fixed designation D6505;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A
2、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 provides a basis for the determinationof the normal-propyl bromide(weight%)in the presence ofstabilizers and impurities,in
3、 virgin or reclaimed normal-propylbromide(nPB).The application range is from 50 wt%to 100wt%.1.2 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 Stand
4、ards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Summary of Test Method2.1 This analytical test method describes the determinationof the assay of n-propyl bromide by gas chromatography usingan internal standard.The results are reporte
5、d in weight percent.3.Significance and Use3.1 This test method provides an analysis in weight percentof the normal-propyl bromide concentration of virgin,formulated,or reclaimed normal-propyl bromide:compoundsthat co-elute with normal-propyl bromide or normal-heptane(internal standard)may interfere
6、with this test method.4.Apparatus4.1 Gas ChromatographHewlett Packard 5890 Series IIequipped with a split/splitless injector,a flame ionizationdetector,and an autosampler,HP,or equivalent,if available.4.2 Column30 m by 0.25 mm,1.0 m film thicknessAllTech AT-5,or equivalent,capillary column.4.3 Syrin
7、ge5 L or 10 L GC autosampler syringe.4.4 Data Acquisition and Analysis DeviceVAX MULTI-CHROM or equivalent chromatography data collection andprocessing system,or integrator.4.5 Crimp Top VialsHewlett Packard 2 mL glass crimptop vials with TFE-fluorocarbon-lined silicone septa or equiva-lent.4.6 Volu
8、metric Pipet25 mL.4.7 Glass Vials32 mLglass vials(25 mm by 95 mm),withTFE-fluorocarbon-lined screw caps.4.8 Transfer PipetsBorosilicate glass transfer pipets.4.9 Precision Balance,accurate to 0.1 mg.5.Required Chemicals5.1 n-Propyl Bromide(1-Bromopropane),99+%,AldrichChemical Company5.2 n-Heptane(in
9、ternal standard),Reagent Grade,99.5+%,J.T.Baker(or equivalent)5.3 Methylene Chloride,99+%,Aldrich Chemical Com-pany(or equivalent)6.Suggested Analysis Conditions6.1 Chromatographic Conditions:Injector150 CDetector temperature250 CFID detector rangemost sensitive settingTemperatureprogram30 C for 10
10、min30 C to 250 C at 15 C minhold at 250 C for 10 minCarrier gasHe(or N2)at 1 mL/minsplit flow:25 mL/mincolumn head pressure:7.5 psiMake-up gasHe(or N2)at 30 mL/minInjection volume0.5 L7.Analytical Procedure7.1 Internal Standard Calibration MixtureCarefullyweigh about 0.25 g of n-heptane internal sta
11、ndard and about0.5 g of n-propyl bromide into a 32 mL glass vial.Record theactual weights for each.Pipet 25 mLof methylene chloride intothis vial and cap immediately.Mix well and then transferapproximately 1 mL of this standard solution into an autosam-pler vial.Cap the vial and analyze in accordanc
12、e with theconditions specified in the chromatographic conditions section.1This test method is under the jurisdiction of ASTM Committee D26 onHalogenated Organic Solvents and Fire Extinguishing Agents and is the directresponsibility of Subcommittee D26.04 on Test Methods.Current edition approved May
13、1,2022.Published May 2022.Originallyapproved in 2000.Last previous edition approved in 2017 as D650500(2017).DOI:10.1520/D6505-00R22.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance wit
14、h 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.1Inject this standard at least three times an
15、d calibrate an internalstandard method in the data system using the results from thestandard analyses.7.2 Preparation of Samples for AnalysisWeigh about 0.25g of n-heptane and about 0.5 g of sample into a 32 mL glassvial.Record the actual weights for each.Pipet 25 mL ofmethylene chloride into this v
16、ial and cap immediately.Mixwell and transfer approximately 1 mL of this solution to anautosampler vial.Cap the vial and analyze in accordance withthe conditions specified in the chromatographic conditionssection.The following table shows components of interest,their absolute retention time(ART)in minutes,their relativeretention time(RRT)in relation to n-heptane,the internalstandard,as well as their relative response factor(RRf).ComponentARTRRTRRfn-propyl bromide13.300.830.3495n-heptane(internal
