Designation:D2031–97StandardTestMethodforReducingSubstancesinRefinedPyridine1ThisstandardisissuedunderthefixeddesignationD2031;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthequalitativedeterminationofreducingsubstancesinrefinedpyridine.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecifichazardstatements,seeSection6.2.ReferencedDocuments2.1ASTMStandards:D1193SpecificationforReagentWater2D3437PracticeforSamplingandHandlingLiquidCyclicProducts32.2OtherDocument:4OSHARegulations,29CFR,paragraphs1910.1000and1910.1200.3.SummaryofTestMethod3.1Specifiedvolumesofpyridineandpotassiumperman-ganatearemixed,allowedtostandfor30minatroomtemperature,andthecolorofthesolutionnoted.4.SignificanceandUse4.1Thistestmethodgivesaqualitativemeansofdetectionofreducingsubstancesinpyridine.5.Reagents5.1PurityofReagents—Reagentgradechemicalsshallbeusedinalltests.Unlessotherwiseindicated,itisintendedthatallreagentsshallconformtothespecificationsoftheCommit-teeonAnalyticalReagentsoftheAmericanChemicalSociety,wheresuchspecificationsareavailable.5Othergradesmaybeused,provideditisfirstascertainedthatthereagentisofsufficientlyhighpuritytopermititsusewithoutlesseningtheaccuracyofthedetermination.5.2PurityofWater—Unlessotherwiseindicated,referencestowatershallbeunderstoodtomeanreagentwaterconformingtoTypesItoIVofSpecificationD1193.5.3PotassiumPermanganateSolution(3.2g/L)—Dissolve3.2gofpotassiumpermanganate(KMnO4)inwateranddiluteto1Linavolumetricflask.Standardizationofthesolutionisnotrequired.Storethepermanganatesolutioninabrownbottleandpreparefreshevery30days.5....
