Designation:D4471−10StandardTestMethodforPyridineBasesinCresylicAcidbyDirectTitration1ThisstandardisissuedunderthefixeddesignationD4471;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationofpyridineandotherbasicnitrogenimpuritiesincrudeandrefinedcresylicacidsstreams,includingmixtures.1.2Thistestmethodisapplicableforpyridinebaselevelsof0.001%to0.5%.1.3Indeterminingtheconformanceofthetestresultsusingthismethodtoapplicablespecifications,resultsshallberoundedoffinaccordancewiththerounding-offmethodofPracticeE29.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecifichazardstatements,seeSection8.2.ReferencedDocuments2.1ASTMStandards:2D3852PracticeforSamplingandHandlingPhenol,Cresols,andCresylicAcidD4790TerminologyofAromaticHydrocarbonsandRelatedChemicalsD6809GuideforQualityControlandQualityAssuranceProceduresforAromaticHydrocarbonsandRelatedMa-terialsE29PracticeforUsingSignificantDigitsinTestDatatoDetermineConformancewithSpecifications2.2OtherDocument:OSHARegulations,29CFRparagraphs1910.1000and1910.120033.Terminology3.1FordefinitionsoftermsusedinthistestmethodseeTerminologyD4790.4.SummaryofTestMethod4.1Thistestmethodisadirect,nonaqueoustitrationtech-niqueutilizingperchloricacidinaceticacidastitrantandthecresylicaciditselfastitrationsolvent.Endpointsmaybeestablishedpotentiometricallyaswellasbyindicatorsothatthemethodisapplicabletohighlycoloredaswellaslightercoloredmaterials.Thistestmethodwilldetectbasiccompo-nentsotherthanpyr...
