Designation:D3448−10(Reapproved2015)´1StandardTestMethodforSpecificAqueousConductanceofTrichlorotrifluoroethane1ThisstandardisissuedunderthefixeddesignationD3448;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—Editorialchangesweremadein1.3andX1.1inJune2015.1.Scope1.1Thistestmethodcoversthedeterminationofaqueousconductivityduetoionizablecontaminantsextractedfromtrichlorotrifluoroethane.Thevalueof1.9µS/cmasmaximumspecificaqueousconductancecorrespondsto0.1ppmofchlorideion(100ppb).Itwascalculatedbyputtingthesolventspecificationof0.1ppmchlorideintotheequationofthesubjectmethodtofindC2−C1equals19.08.Thespecificconductanceduetocontaminantsfromthesolventwasthencalculatedasfollows:~C22C1!C35~19!~0.1!51.9µS/cm(1)1.2Theaboveisexclusiveofthebackgroundspecificconductanceofthewaterusedintheanalysis.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3.1Exception—Valuesarestatedininch-poundunitsinFig.1.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoconsultandestablishappropriatesafetyandhealthpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.SpecificprecautionarystatementsaregiveninSection6.2.SummaryofTestMethod2.1Ionizableimpuritiesinthesolventareextractedwithwaterofknownlowconductivity.Theincreaseinwaterconductivitymeasurestheamountoftheseimpuritiespresent.3.SignificanceandUse3.1Thistestmethodallowsforthedeterminationofioniz-ablecontaminants(expressedintermsofppbofHCl)intrichlorotrifluoroethaneviameasurementofspecificaqueousconductance.3.2Thistestmethodcanbeusedforestablishingmanufac-turingandpurchasingspecifications.4.Apparatus4.1ConductivityBridge.24.2ConductivityCell,3dip-type.Cellconstantof0....
