Designation:D2284−11StandardTestMethodforAcidityofSulfurHexafluoride1ThisstandardisissuedunderthefixeddesignationD2284;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationoftheacidicfluoridesofsulfurhexafluoride(SF6).1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWater3.SummaryofTestMethod3.1Acidicconstituentsofthesampleareabsorbedinslightlyalkalinewatercontaininganindicatorandtheexcessbasetitratedwithastandardacidsolution.Theresultantacidityisexpressedasequivalentsofhydrofluoricacid(HF).4.SignificanceandUse4.1AcidicfluoridesareundesirableinSF6usedasanelectricalinsulatinggasinthattheymaycontributetocorro-sionorconstitutedielectrichazard.4.2ThistestmethodisvalidforbothnewandusedSF6.InusedSF6,itwillonlymeasurethoseactivespecieswhicharehydrolyzable.5.Apparatus5.1GasWashingBottles,500-mLcapacity,tworequired.5.2Microburet,graduatedto0.01mL.5.3WetTestMeter.NOTE1—ThemeterisusedtomeasurethevolumeofdrygasinlitersandhencetheweightofSF6samples.Thedensityofsulfurhexafluorideat0°Cand1atm.ofpressure(STP)is6.52g/L.Thedensityofsulfurhexafluorideat25°Cand1atm.ofpressure(normaltemperatureandpressure)is5.97g/L.Alternatively,thesampleweightmaybedeterminedbyweighingthesamplecylinderbeforeandaftersampling.6.Reagents6.1PurityofReagents—Usereagentgradechemicalsinalltests.Unlessotherwiseindicated,itisintendedthatallreagentsshallconformtothespecificationsoftheCommitteeonAnalytic...
