Designation:D3634−99(Reapproved2015)StandardTestMethodforTraceChlorideIoninEngineCoolants1ThisstandardisissuedunderthefixeddesignationD3634;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethodcoversthedeterminationofchlorideioninenginecoolantsintherangefrom5to200ppminthepresenceofupto0.6weight%mercaptobenzothiazole.1.2Othermaterialsthatreactwithsilverionwillinterfere.1.3Chlorideinenginecoolantscontaininganaryltriazoleinsteadofmercaptobenzothiazolecanbedetermineddirectlybythistestmethodwithoutpretreatmentwithhydrogenper-oxide.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.SpecifichazardsstatementsaregiveninSection7.2.ReferencedDocuments2.1ASTMStandards:2D1176PracticeforSamplingandPreparingAqueousSolu-tionsofEngineCoolantsorAntirustsforTestingPurposesD1193SpecificationforReagentWaterE200PracticeforPreparation,Standardization,andStorageofStandardandReagentSolutionsforChemicalAnalysis2.2ManufacturingChemistsAssociationDocument:3MCAChemicalSafetyDataSheetSD-533.SummaryofTestMethod3.1ThesampleisfirsttreatedatapHof12to13withaqueoushydrogenperoxidetooxidizethemercaptobenzothi-azoletosoluble,noninterferingsulfonate.Thetreatedsampleisdissolvedinglacialaceticacidandtitratedpotentiometricallywithdilutestandardsilvernitratesolution.Sincethesolubilityofsilverchlorideinthissystemissufficienttopreventobtainingasuitableinflectionattheverylowlimitofthetestmethod,somechlorideisdeliberatelyadd...
