Designation:D7704−12StandardTestMethodforTotalAldehydesinStyreneMonomerbyPotentiometricTitration1ThisstandardisissuedunderthefixeddesignationD7704;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthewetchemicaldeterminationofaldehydesinstyrenemonomer.Aldehydesarecalculatedandreportedasbenzaldehyde.Therangeofconcentrationforthistestmethodis0.001mass%to0.030mass%.1.2Indeterminingconformanceofthetestresultsusingthismethodtoapplicablespecifications,resultsshallberoundedoffinaccordancewiththerounding-offmethodofPracticeE29.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWaterD3437PracticeforSamplingandHandlingLiquidCyclicProductsD6809GuideforQualityControlandQualityAssuranceProceduresforAromaticHydrocarbonsandRelatedMa-terialsE29PracticeforUsingSignificantDigitsinTestDatatoDetermineConformancewithSpecifications2.2OtherDocuments:OSHARegulations,29CFRparagraphs1910.1000and1910.120033.SummaryofTestMethod3.1Analcoholicsolutionofhydroxylaminehydrochlorideisaddedtoaspecimenofstyrenemonomer.ActivealdehydespresentreactinaccordancewithEq1:RCHO1NH2OH·HCl→RCHNOH1H2O1HCl(1)Theamountofhydrochloricacidreleased,whichisequiva-lenttothealdehydepresentinthesample,istitratedwithstandardalcoholicpotassiumhydroxidesolution.4.SignificanceandUse4.1Thistestmethodissuitablefordeterminingthequantityofaldehydes,bothforqualitycontrolandqualityassuranceoftheproduct.5.Interferences5.1Ketones,ifpresent,i...
