Designation:D3838−05(Reapproved2011)StandardTestMethodforpHofActivatedCarbon1ThisstandardisissuedunderthefixeddesignationD3838;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThistestmethodcoversdeterminationofthepHofawaterextractofactivatedcarbon.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecifichazardstatements,seeSection6.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWaterD1293TestMethodsforpHofWaterD2867TestMethodsforMoistureinActivatedCarbonD6851TestMethodforDeterminationofContactpHwithActivatedCarbonE300PracticeforSamplingIndustrialChemicals3.SummaryofTestMethod3.1Anactivatedcarbonsampleisboiledinreagentwaterusingarefluxcondensertorecyclewatervapor.Theparticlesofcarbonarefilteredout,thefiltratecooledto50°CandthepHofthefiltratedeterminedbyelectrometicmeasurement.4.SignificanceandUse4.1Whenafluidcontaininganadsorbateispassedthroughabedofactivatedcarbon,chemicalreactionsmaytakeplacebetweentheactivatedcarbon,itsothernoncarbonaceousconstituents,andtheadsorbatecontainingfluid.ThepHofthecarbonmaybeasignificantparameterofsuchareactionandthereforemaybeanimportantcharacteristicofthecarbon.5.ApparatusandMaterials5.1AnalyticalBalance,capacity100g,precision60.01g.5.2HotPlate.5.3GlasswareforBoiler-RefluxCondenserApparatus(Fig.1)—Itemsshownareforguidanceonly,providingaconvenientsetofequipmentavailableoff-the-shelffrommanylaboratorysupplyhouses.The“all-glass”elements,withstandard-taperandballjoints,providefreedomfromcontaminationan...
