Designation:D4278–02StandardPracticeforWetAshingProcedureforPreparingWoodSamplesforInorganicChemicalAnalysis1ThisstandardisissuedunderthefixeddesignationD4278;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticeconsistsofaprocedurefordecompositionofwoodasaninitialstepforanalysisfortheconstituentsarsenic,chromium,copper,phosphate,andzinc,allofwhichmaythenbeanalyzedinaccordancewithTestMethodsD1326,D1627,D1628andD5584.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Specificprecau-tionarystatementsaregiveninSection7.2.ReferencedDocuments2.1ASTMStandards:D1326MethodsforChemicalAnalysisofAmmoniacalCopperArsenate2D1627MethodsforChemicalAnalysisofAcidCopperChromate2D1628TestMethodsforChemicalAnalysisofChromatedCopperArsenate2D5584TestMethodsforChemicalAnalysisofAmmonia-calCopperQuat,TypeB(ACQ-B)23.SummaryofTestMethod3.1Asmall(upto5g)sampleofchoppedorgroundwood(usuallytreated)isoxidizedandsolubilizedbyaninitialdigestioninhotconcentratednitricacid.Thisisfollowedbyfurtherdigestionaftertheadditionofasolutionofaqueousperchloricacidinconcentratedsulfuricacid.Thecooledsolutionofmetalsaltsisthendilutedandissuitableforanalysisbytheappropriatemethod.4.SignificanceandUse4.1Manywoodpreservativesconsistofinorganicmaterials.Thesematerialsareoftenpreferablyanalyzedindiluteaqueoussolutionsintheabsenceoforganicmatter.Thispracticeprovidesameansforthepreparationofadiluteaqueoussolutionoftheinorganicmaterialswhichareinwoodbysimultaneouslydecomposingthewoodsampleandsolubilizingtheinorganicmaterials.TheaqueoussolutionmaythenbeanalyzedforitsinorganicconstituentsbyapplicableASTMtes...
