Designation:D6646−03(Reapproved2014)StandardTestMethodforDeterminationoftheAcceleratedHydrogenSulfideBreakthroughCapacityofGranularandPelletizedActivatedCarbon1ThisstandardisissuedunderthefixeddesignationD6646;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodisintendedtoevaluatetheperformanceofvirgin,newlyimpregnatedorin-service,granularorpellet-izedactivatedcarbonfortheremovalofhydrogensulfidefromanairstream,underthelaboratorytestconditionsdescribedherein.Ahumidifiedairstreamcontaining1%(byvolume)hydrogensulfideispassedthroughacarbonbeduntil50ppmbreakthroughofH2Sisobserved.TheH2Sadsorptioncapacityofthecarbonperunitvolumeat99.5%removalefficiency(gH2S/cm3carbon)isthencalculated.Thistestisnotnecessarilyapplicabletonon-carbonadsorptivematerials.1.2Thisstandardaswrittenisapplicableonlytogranularandpelletizedactivatedcarbonswithmeanparticlediameters(MPD)lessthan2.5mm.Seeparagraph5.3ifactivatedcarbonswithlargerMPDsaretobetested.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D2652TerminologyRelatingtoActivatedCarbonD2854TestMethodforApparentDensityofActivatedCarbonD2867TestMethodsforMoistureinActivatedCarbonE300PracticeforSamplingIndustrialChemicals3.Terminology3.1TermsrelatingtothisstandardaredefinedinD2652.4.SummaryofTestMethod4.1Breakthroughcapacityisdeterminedbypassingastreamofhumidifiedaircontaining1volume%hydrogensulfidethroughasampleofgranularorpelletizedactivatedcarbonofknownvolumeunderspecifiedconditionsuntiltheconcentrationofhydrogensulfideintheeffluentgasreaches50ppmv.5.SignificanceandUse5.1Thismethod...
