1、Designation:D344300(Reapproved 2020)Standard Test Method forChloride in Trichlorotrifluoroethane1This standard is issued under the fixed designation D3443;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A nu
2、mber in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method covers the determination of chloride in
3、trichlorotrifluoroethane and other halocarbons that are liquid atroom temperature.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,if any,associated with
4、its use.It is theresponsibility of 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.1.4 This international standard was developed in accor-dance with internationally recognized princi
5、ples 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.Summary of Test Method2.1 This test method is based on the determination ofio
6、nizable chloride by titration with mercuric acetate solutionusing s-diphenylcarbazone as the indicator.3.Significance and Use3.1 This test method determines ionizable chloride that canbe aqueously extracted from trichlorotrifluoroethane.3.2 This test method can be used to establish production andpur
7、chasing specifications.4.Apparatus4.1 Separatory Funnels,two 250 mL,with polytetra-fluoroethylene stopcocks.4.2 Erlenmeyer Flask,125 mL.5.Reagents5.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended thatall reagents shall conform to the sp
8、ecifications of the Commit-tee on Analytical Reagents of the American Chemical Society,where such specifications are available.2Other grades may beused,provided it is first ascertained that the reagent is ofsufficiently high purity to permit its use without lessening theaccuracy of the determination
9、.5.2 Purity of WaterUnless otherwise indicated,referencesto water shall be understood to mean halide-free distilled water.5.3 s-Diphenylcarbazone SolutionDissolve 0.5 g ofs-diphenylcarbazone,in 100 mL of methanol.5.4 Silver Nitrate SolutionDissolve 8.5 g of silver nitrate(AgNO3)in 500 mL of water.5.
10、5 Standard Mercuric Acetate SolutionDilute 40 mL ofstock mercuric acetate solution,reagent 2,to 1000 mL andadjust the pH to 1.6 with nitric acid.Standardize as follows:5.5.1 Pipet 10.00 mL of standard sodium chloride solutioninto a 250 mL Erlenmeyer flask.Add 20 mL of chloride-freewater and 5 drops
11、of s-diphenylcarbazone solution.Titrate withstandard mercuric acetate solution to the faint purple end point.Then:mL NaCl31.000mL mercuric acetate5 F 5 g Cl/mL(1)whereF=factor for the mercuric acetate solution(see 7.1).5.6 Standard Sodium Chloride SolutionDissolve 0.0660 gof sodium chloride in water
12、 and dilute to 1000 mL.Pipet25 mL of this solution into a 1000-mL volumetric flask,diluteto volume,and mix.One millilitre of this solution contains1.00 g of chloride ion.1This test method is under the jurisdiction of ASTM Committee D26 onHalogenated Organic Solvents and Fire Extinguishing Agents and
13、 is the directresponsibility of Subcommittee D26.04 on Test Methods.Current edition approved Jan.1,2020.Published January 2020.Originallyapproved in 1975.Last previous edition approved in 2015 as D344300(2015).DOI:10.1520/D344300R20.2Reagent Chemicals,American Chemical Society Specifications,America
14、nChemical 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),Rockville,MD.
15、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 Internatio
16、nal Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.5.7 Stock Mercuric Acetate SolutionDissolve 1.6 g ofmercuric acetate in 500 mLof water containing 3.5 mLof nitricacid.Dilute to 1000 mL and mix.6.Procedure6.1 Wash all glassware with chloride-free water until 10 mLof the washings show no trace of turbidity when 1 mL of silvernitrate solution is added.6.2 Transfer 100 mL of the sample into a 250 mL separatoryfunnel,add 25 mL o
