Designation:D1109−21StandardTestMethodfor1%SodiumHydroxideSolubilityofWood1,2ThisstandardisissuedunderthefixeddesignationD1109;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthesolu-bilityofwoodinahotdilutealkalisolution.A1%solutionofsodiumhydroxide(NaOH)isused.Oneapplicationisindeterminingthedegreeoffungusdecaythathastakenplaceinagivenwoodsample.Asthewooddecays,thepercentageofalkali-solublematerialincreasesinproportiontothedecreaseinpulpyieldcausedbythedecay.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.3Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.SignificanceandUse2.1Hotalkaliextractslowmolecularweightcarbohydratesconsistingmainlyofhemicelluloseanddegradedcelluloseinwood.Thissolubilityofwoodisanindicationofthedegreeoffungaldecay,ordegradationbyheat,light,oxidation,andsoforth.Themoredecayordegradation,thehigherthesolubility.3.Apparatus3.1WaterBath—Thewaterbathshallbedesignedsothatthetemperatureofthematerialduringtreatmentisuniformlymaintainedat97to100°C.Whenanewbathisusedthetemperatureshallbecheckedtoensuretheuseofproperconditions(seeNote1).NOTE1—Thetypeofbathrecommendedisonethatiscoveredandthathasholesinthetopofsuchsizethatbeakersmaybesetdowninthebathuntiltheyaresupportedbytheflaredrimofthebeakers.Thetopofthebeakerisrecommendedtobenearlylevelwiththecoveroftheb...
