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1、Designation:D6851?02(Reapproved2011)StardTestMethodfDeterminationofContactpHwithActivatedCarbon1ThisstardisissuedunderthefixeddesignationD6851thenumberimmediatelyfollowingthedesignationindicatestheyearofiginaladoptionint

2、hecaseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1.Scope1.1ThismethodistobeusedinthedeterminationofthepHofwa

3、teroninitialcontactwithactivatedcarbon.ThistestmethodisnotmeantasareplacementfTestMethodD3838maygiveadifferentvalue.1.2Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityof

4、theuserofthisstardtoestablishappropriatesafetyhealthpracticestodeterminetheapplicabilityofregulatylimitationspritouse.2.ReferencedDocuments2.1ASTMStards:2D1193SpecificationfReagentWaterD1293TestMethodsfpHofWaterD3838Test

5、MethodfpHofActivatedCarbonE300PracticefSamplingIndustrialChemicals3.SummaryofTestMethod3.1AsampleofcarbonisstirredwithwaterthepHofthesuspensionismeasured.4.SignificanceUse4.1ThedeterminationofcontactpHcanbeusedasasimplef

6、astmeasurementthatcanallowactivatedcarbonproducersuserstohaveastardmethodfassessingtheeffectvariouscarbonswillhaveontheinitialpHofthewaterincontactwiththecarbon.IthasbeendeterminedthatthereisabiasbetweenthismethodTestMet

7、hodD3838theyarenotequivalent.5.Interferences5.1pHelectrodesusedtomeasurethisquantitycaneventuallybecomecloggedovertimewithcarbonfines.Suitableelectrodescanbefoundwhichhaveadetachablejunctionallowingtheuserwhennecessaryto

8、discardafouledpHmembrane.5.2Distilledwatercanbecomeacidiconsting.MakesurethatthewaterusedmeetstheminimumrequirementsfASTMTypeIIwater.DeterminethepHasindicatedinTestMethodD1293.6.Apparatus6.1ApHmeter(ambienttemperatureof2

9、5CisassumedifotherwisetemperaturecompensationisrequiredfaccuratepHmeasurement.6.2AcombinationpHelectrodeglasscalomelelectrodesusedtogether.6.3A100mL(TD)graduatedcylinder6.4A250mLglassbeaker(feachsample)6.5Apolymercoatedm

10、agicstirbar(feachsample)6.6Magicstirplate6.7Abalancecapableofaccuratelymeasuringto0.1g7.ReagentsMaterials7.1DistilleddeionizedwaterthatmeetstheASTMTypeIIrequirements7.2BufferstocalibratethepHmetertypicallypH4.0pH7.0pH10.

11、08.Hazards8.1ThewaterincontactwiththecarbonmayhaveeitheralowhighpH.Takeprecautionsaccdinglywearnecessaryprotectiveequipmenttopreventinjuriesfromspillssplashes.9.SamplingTestSpecimensTestUnits9.1FollowPracticeE300inthecol

12、lectionpreparationofsamples.10.PreparationofApparatus10.1UsetheprocedureofTestMethodsD1293tostardizethepHmeterbefemeasurement.11.CalibrationStardization11.1Seeabovesection.1ThisspecificationisunderthejurisdictionofASTMCo

13、mmitteeD28onActivatedCarbonisthedirectresponsibilityofSubcommitteeD28.02onLiquidPhaseEvaluation.CurrenteditionapprovedSept.12011.PublishedNovember2011.iginallyapprovedin2002.Lastpreviouseditionapprovedin2007asD6851–02(20

14、07).DOI:10.1520D685102R11.2FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsite.Copyright?ASTMInternati

15、onal100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates112.Conditioning12.1Thesampleshouldbetestedasreceived.13.Procedure13.1Arepresentativesampleshouldbetakenfromthequantitytobetestedpreparedftesting(asrec

16、eived).13.2Ten(10)gramsofsample(asreceived)willbeusedfthetest.Place10gofarepresentativesampleintoa250mLbeaker.13.3ThepHofthewatertobeusedshouldbedeterminedrecdedbefeuse.13.4Usingagraduatedcylindermeasureadd100mLofwaterto

17、thetengramsampleinthebeaker.13.5Addonestirbarstirftenminuteswithsufficientturbulencetofluidizethesampleinthebeaker.(Warning—toovigousstirringshouldbeavoidedasthismayintroduceairintothesampleaffectingpH.)13.6Stopstirringw

18、ithoutdelayfilteringmeasurethepHofthesuspension.14.CalculationInterpretationofResults14.1Nocalculationsarenecessaryifthemeterresultsarealreadytemperaturecrected.15.Rept15.1Reptthevaluefromstep13.6asthecontactpH.16.Precis

19、ionBias16.1Basedonlimitedinfmationfromonelabatywithonesampletestedintriplicatetherepeatabilitystarddeviationsthe95%repeatabilitylimitsare:ContactpH(avg.of3)StardDeviation95%ConfidenceLimits8.50.22.35%16.2Theinterlabatybi

20、asofthismethodhasnotbeenquantitativelydeterminedbutithasbeenobservedthatitisnotequivalenttoTestMethodD3838shouldnotbeconfusedwithmeanttoreplacethatmethod.17.Keywds17.1activatedcarboncontactpHASTMInternationaltakesnoposit

21、ionrespectingthevalidityofanypatentrightsassertedinconnectionwithanyitemmentionedinthisstard.Usersofthisstardareexpresslyadvisedthatdeterminationofthevalidityofanysuchpatentrightstheriskofinfringementofsuchrightsareentir

22、elytheirownresponsibility.Thisstardissubjecttorevisionatanytimebytheresponsibletechnicalcommitteemustbereviewedeveryfiveyearsifnotrevisedeitherreapprovedwithdrawn.Yourcommentsareinvitedeitherfrevisionofthisstardfaddition

23、alstardsshouldbeaddressedtoASTMInternationalHeadquarters.Yourcommentswillreceivecarefulconsiderationatameetingoftheresponsibletechnicalcommitteewhichyoumayattend.Ifyoufeelthatyourcommentshavenotreceivedafairhearingyousho

24、uldmakeyourviewsknowntotheASTMCommitteeonStardsattheaddressshownbelow.ThisstardiscopyrightedbyASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959UnitedStates.Individualreprints(singlemultiplecopies)ofth

25、isstardmaybeobtainedbycontactingASTMattheaboveaddressat6108329585(phone)6108329555(fax)(email)throughtheASTMwebsite(www.astm.g).PermissionrightstophotocopythestardmayalsobesecuredfromtheASTMwebsite(www.astm.gCOPYRIGHT).D

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