Designation:D2352−85(Reapproved2015)StandardTestMethodforSulfurDioxideinWhitePigmentSeparatedfromSolvent-ReduciblePaints1ThisstandardisissuedunderthefixeddesignationD2352;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofsulfurdioxideinwhitepigmentseparatedfromsolvent-reduciblepaints.1.2Thistestmethodisnotapplicableinthepresenceofsulfidesdecomposableundertheconditionsgiven.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWaterD2371TestMethodforPigmentContentofSolvent-ReduciblePaints3.SummaryofTestMethod3.1Theextractedpigmentisplacedinaflaskandthensulfurdioxide(SO2)isreleasedbyadditionofhydrochloricacid(HCl)andbubbledthroughanabsorptionflaskcontainingiodinesolutionandpotassiumiodide(KI).Thesolutionistitratedwithsodiumthiosulfate(Na2S2O3)usingstarchindi-cator.3.2Ablankisrunasdirectedin3.1withthepigmentomitted.TheblankisthensubtractedfromthefigureobtainedforthesampletitrationandSO2iscalculated.4.SignificanceandUse4.1Calciumsulfatepigmentssuchastitanium-calciumhavebeenusedinpaintsinvaryingdegreesinthepastyears.Assuchitisusefultotheformulatorandtheusertobeabletomonitortheamountofthiscompoundinwholepaints.5.Reagents5.1PurityofReagents—Reagentgradechemicalsshallbeusedinalltests.Unlessotherwiseindicated,itisintendedthatallreagentsshallconformtothespecificationsoftheCommit-teeonAnalyticalReagentsoftheAmericanChemicalSociety,wheresuchspecificationsareavailable.3O...
