Designation:D7883−13StandardTestMethodforDeterminationof4-Carboxybenzaldehydeandp-ToluicAcidinPurifiedTerephthalicAcidbyWeakAnionExchangeHighPerformanceLiquidChromatography1ThisstandardisissuedunderthefixeddesignationD7883;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethod2coversthedeterminationofthe4-Carboxybenzaldehyde(4-CBA)andp-Toluicacid(p-TOL)inpurifiedterephthalicacid(PTA)byweakanionexchangehighperformanceliquidchromatography(HPLC).Thismethodisapplicablefor4-CBAfrom2to500mg/kgandforp-TOLfrom10to500mg/kg,respectively.1.2Indeterminingtheconformanceofthetestresultsusingthismethodtoapplicablespecification,resultsshallberoundedoffinaccordancewiththerounding-offmethodofPracticeE29.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:3D1193SpecificationforReagentWaterD4790TerminologyofAromaticHydrocarbonsandRelatedChemicalsD6809GuideforQualityControlandQualityAssuranceProceduresforAromaticHydrocarbonsandRelatedMa-terialsE29PracticeforUsingSignificantDigitsinTestDatatoDetermineConformancewithSpecificationsE177PracticeforUseoftheTermsPrecisionandBiasinASTMTestMethodsE682PracticeforLiquidChromatographyTermsandRela-tionshipsE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod2.2ISODocument:4ENISO8213Chemicalproductsforindustrialuse—Samplingtechniques—Solidchemicalproductsintheformofparticlesvaryingfrompowderstocoarselumps2.3OtherDocument:5OSHARegulations,29CFRparagraphs1910.1000and1...
