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1、Designation:D1287?11StardTestMethodfpHofEngineCoolantsAntirusts1ThisstardisissuedunderthefixeddesignationD1287thenumberimmediatelyfollowingthedesignationindicatestheyearofiginaladoptioninthecaseofrevisiontheyearoflastrev

2、ision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.ThisstardhasbeenapprovedfusebyagenciesoftheDepartmentofDefense.1.Scope1.1Thistestmethodcove

3、rsthedeterminationofthepHofunusedenginecoolantsantirustsusedunusedaqueousdilutionsoftheconcentratedproducts.NOTE1—Antirustsinsolidfmarenotincludedinthistestmethod.NOTE2—Itisbelievedthatthisproceduregivesalltheinfmationre

4、quiredfdeterminingthepHofsamplesofenginecoolantantirustlikelytobeencountered.ShouldadditionalinfmationonpHdeterminationsbeneededreferenceshouldbemadetoTestMethodE70.1.2Thisstarddoesnotpurpttoaddressallofthesafetyconcerns

5、ifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitationspritouse.2.ReferencedDocuments2.1ASTMStards:2D1176PracticefSampl

6、ingPreparingAqueousSolutionsofEngineCoolantsAntirustsfTestingPurposesE70TestMethodfpHofAqueousSolutionsWiththeGlassElectrode3.SummaryofTestMethod3.1Asampleasreceivedafterdilutionwithaspecifiedvolumeofdistilledwaterisplac

7、edinabeakersamplecupthepHmeasuredwithapHmetercombinationelectrodeassociatedglasssaturatedcalomelelectrodepair.NOTE3—ThereadingsofthemeterinthecaseoftheconcentratedproductsarenotpHvaluesaccdingtotheaccepteddefinitionbutar

8、eapparentpHvalueswhichareusefulintheinterpretationoftheconditionoftheproduct.4.SignificanceUse4.1pHisameasureofthehydrogenionconcentrationindicateswhetheranenginecoolantantirustasolutionofthesecompoundsisacidicalkalinene

9、utral.4.2ThepHrangeincludesvaluesfrom0to14.Valuesfrom0to7representtheacidichalfofthescale.Valuesfrom7to14representthealkalinebasichalfofthescale.ThepHvalue7isconsideredneutralasitisneitheracidicnalkaline.4.3pHissometimes

10、usedfproductionqualitycontrol.ItisgenerallydesirablethatenginecoolantshaveanalkalinepH.4.4pHisnotsignificantfromthestpointofpredictingservicelife.ThepHofusedenginecoolantsantirustsolutionsisnotadependableindicationofeith

11、erexistingeffectivenessremaininglifeofthesolution.5.Apparatus5.1ThepHmeterglasselectrodecalomelelectrodeshallbeasspecifiedintheAnnex.NOTE4—InpHoperationthemetermaybesetuptoperfmonetwouptofivepointstardizationsmaybesetupt

12、oautomaticallyrecognizeU.S.stard(pH4710)buffersNISTInternational(pH1.684.016.869.1812.46)buffersacustomusercenteredsetofbuffersboth.6.Reagents6.1PurityofReagents—Reagentgradechemicalsshallbeusedinalltests.Unlessotherwise

13、indicateditisintendedthatallreagentsshallconfmtothespecificationsoftheCommitteeonAnalyticalReagentsoftheAmericanChemicalSocietywheresuchspecificationsareavailable.3Othergradesmaybeusedprovideditisfirstertainedthatthereag

14、entisofsufficientlyhighpuritytopermititsusewithoutlesseningtheaccuracyofthedetermination.6.2PurityofWater—Unlessotherwiseindicatedreferencestowatershallbeunderstoodtomeandistilledwaterwaterof1Thistestmethodisunderthejuri

15、sdictionofASTMCommitteeD15onEngineCoolantsRelatedFluidsisthedirectresponsibilityofSubcommitteeD15.04onChemicalProperties.CurrenteditionapprovedOct.12011.PublishedOctober2011.iginallyapprovedin1953asD1287–53T.Lastprevious

16、editionapprovedin2009asD1287–09.DOI:10.1520D128711.2FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsit

17、e.3ReagentChemicalsAmericanChemicalSocietySpecificationsAmericanChemicalSocietyWashingtonDC.FsuggestionsonthetestingofreagentsnotlistedbytheAmericanChemicalSocietyseeAnalarStardsfLabatyChemicalsBDHLtd.PooleDsetU.K.theUni

18、tedStatesPharmacopeiaNationalFmularyU.S.PharmacopeialConventionInc.(USPC)RockvilleMD.Copyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates1stardbuffersolutionwithin60.05unitwithoutc

19、hangingthesettingofthestardizationofasymmetrypotentialcontrol.Ifitdoesnotagreeifthemetergivesaslowresponsetimedriftstheelectrodeshouldbecleanedinaccdancewiththemanufacturer’sinstructions.9.1.3Thepresenceofafaultyelectrod

20、eisindicatedbyfailuretoobtainacrectvaluefthepHofthesecondstardbuffersolutionafterthemeterhasbeenstardizedwiththefirst.AcrackedelectrodewilloftenyieldpHvaluesthatareessentiallythesamefbothstardbuffersolutions.9.2Multipoin

21、tstardizationallowsmeasurementstobeperfmedoveraverybroadpHrangebutrequiredtheadditionalefftofcarryingoutfurtherstardizations.WithmultiplebufferpointsthemeterusestheelectrodeslopeapplicabletothepHrangeofthecurrentsample.T

22、hislinearsegmentsmethodisalwaysinpHoperation.WhenstardizationbyautorecognitionofU.S.stardbufferscustombuffersisedthreebufferpointsareusable.WithautorecognitionofNISTbuffersacombinationofU.S.stardcustomNISTbuffersmanualen

23、tryofbuffersuptofivestardizationbuffersarepermitted.10.Procedure10.1MakethepHdeterminationon(1)theunusedconcentratedenginecoolantantirust(asreceived)(2)anydesireddilutionwithdistilledwateroftheconcentratedproduct(3)usede

24、nginecoolantantirustsolution.Fdilutesolutionssuggestedenginecoolantconcentrationsare5033volume%antirustsolutionconcentrationshouldbeintherangeofproposedusage.Preparesolutionsasfollows:Unusedenginecoolantantirustsolutions

25、amplestobetestedshouldbeobtainedfollowingtheapplicableptionsoftheprocedureoutlinedinPracticeD1176.10.1.1Whenasmallinsolubleliquidlayerispresentremoveitpritotestingtheunusedsamplepreparingdilutedsamplesftesting.Usinga100m

26、Lmixingcylinderapipetothersuitablemeasuringdevicemakeupasolutionoftheconcentrationdesiredftestingbymeasuringthenecessaryamountofantifreezeantirustsolutionintothecylinderaddingsufficientdistilledwatertobringthesolutionvol

27、umeto100mL.10.1.2Thoughlymixthecontentsofthecylinderbyshakingtransferintoa250mLtallfmspoutlessothersuitablebeaker.NOTE6—SomepHapparatusisequippedwithasamplecup.Itissatisfactytousethesecupsthesmallersamplerequiredwiththem

28、asanalternativetothe100mLsamplebeakerspecified.10.2PreparethecalomelglasselectrodesasdirectedinSection8.Immersethetipoftheelectrodeinthesolutionagitate.Wheretheinstrumenthasamechanicalstirrerthismaybeused.Allowthesystemt

29、ocometoequilibriumrecdthepHvalue.Removewashtheelectrodeswithdistilledwaterimmersethemindistilledwateruntilthenextdeterminationismade.NOTE7—Intheeventthattheglasselectrodesbecomecoatedwithanoilfilmastheresultoftestingtwop

30、haseproductsitisnecessarytoremovesuchfilmwithasuitablesolventsuchasfinganicdepositswashwithEDTAammoniaacidsfgreasesimilarfilmswashwithacetonemethanol.NOTE8—WithsilicatecontainingenginecoolantitisimptanttospecifythatthepH

31、readingbetakeneitherimmediatelyafterpreparingthedilutionafteraspecifiedperiodoftimesuchas30min.IncontrasttoanimmediatepHthe30minvaluehasbeenshowntobeapproximately0.2unitslowerameasurementmadeafter24hcanbefrom0.3to0.5pHun

32、itslower.11.Rept11.1ReptthepH.12.PrecisionBias12.1Repeatability—Duplicateresultsbythesameoperatshouldnotbeconsideredsuspectunlesstheydifferbymethan60.1pHunits.12.2Reproducibility—Theresultssubmittedbytwomelabatiesshouldn

33、otbeconsideredsuspectunlesstheresultsdifferbymethan60.2pHunits.13.Keywds13.1antirustsenginecoolantspHofenginecoolantsANNEX(MatyInfmation)A1.APPARATUSA1.1MeterA1.1.1Avoltmeterpotentiometerthatwilloperatewithanaccuracyof60

34、.005Vasensitivityof60.002Voverarangeofatleast60.5VwhenthemeterisusedwiththeelectrodesspecifiedinA1.2A1.3whentheresistancebetweentheelectrodesfallswithintherangefrom0.2to20MV.Themetershallbeprotectedfromstrayelectrostatic

35、fieldssothatnopermanentchangeinthemeterreadingsovertheentireoperatingrangeisproducedbytouchingwithagroundedleadanypartoftheexposedsurfaceoftheglasselectrodetheglasselectrodeleadthetitrationstthemeter.Adesirableapparatusm

36、ayconsistofacontinuousreadingelectronicvoltmeterwithspecifiedrangeaccuracysensitivitythatisdesignedtooperateonaninputoflessthan510?12Awhenanelectrodesystemhaving1000MVresistanceisconnectedacrossthemeterterminalsthatispro

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