ASTM_D_3448_-_10_2020.pdf

Designation:D344810(Reapproved 2020)Standard Test Method forSpecific Aqueous Conductance of Trichlorotrifluoroethane1This standard is issued under the fixed designation D3448;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 test method covers the determination of aqueousconductivity due to ionizable contaminants extracted fromtrichlorotrifluoroethane.The value of 1.9 S/cm as maximumspecific aqueous conductance corresponds to 0.1 ppm ofchloride ion(100 ppb).It was calculated by putting the solventspecification of 0.1 ppm chloride into the equation of thesubject method to find C2 C1equals 19.08.The specificconductance due to contaminants from the solvent was thencalculated as follows:C22 C1!C3519!0.1!5 1.9 S/cm(1)1.2 The above is exclusive of the background specificconductance of the water used in the analysis.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3.1 ExceptionValues are stated in inch-pound units inFig.1.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to consult andestablish appropriate safety,health,and environmental prac-tices and determine the applicability of regulatory limitationsprior to use.Specific precautionary statements are given inSection 6.1.5 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.Summary of Test Method2.1 Ionizable impurities in the solvent are extracted withwater of known low conductivity.The increase in waterconductivity measures the amount of these impurities present.3.Significance and Use3.1 This test method allows for the determination of ioniz-able contaminants(expressed in terms of ppb of HCl)intrichlorotrifluoroethane via measurement of specific aqueousconductance.3.2 This test method can be used for establishing manufac-turing and purchasing specifications.4.Apparatus4.1 Conductivity Bridge.24.2 Conductivity Cell,3dip-type.Cell constant of 0.1 recip-rocal centimetre.Electrodes must be bright platinum.4.3 Polyethylene Beaker,250 mL.4.4 Polyethylene Bottles,wide mouth,300 mL and 500 mLsize.4.4.1 Calibrate and mark the outside of the 300 mL poly-ethylene bottles to indicate 20 mL,120 mL,and 220 mL(graduate)of water volume,using deionized water to deter-mine the liquid levels.4.5 Polyethylene Tubing,long enough to reach the bottomof the 300 mL polyethylene bottle.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 specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,where such specifications are available.4Other grades may be1This 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 April 1,2020.Published April 2020.Originallyapproved in 1975.Last previous edition approved in 2015 as D344810(2015)1.DOI:10.1520/D344810R20.2The sole source of supply of the apparatus(Serfass Model RCM-15B1)knownto the committee at this time is Industrial Instrument Inc.,Cedar Grove,NJ.If youare aware of alternative suppliers,please provide this information to ASTMInternational Headquarters.Your comments will receive careful consideration at ameeting of the responsible technical committee,1which you may attend.3The sole source of supply of the apparatus(Model Cel-A01)known to thecommittee at this time is Industrial Instrument Inc.,Cedar Grove,NJ.If you areaware of alternative suppliers,please provide this information to ASTM Interna-tional Headquarters.Your comments will receive careful consideration at a meetingof the responsible technical committee,1which you may attend.4Reagent Chemicals,American Chemical Society Specifications,AmericanChemical 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.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 P