Designation:E1690−08StandardTestMethodforDeterminationofEthanolExtractivesinBiomass1ThisstandardisissuedunderthefixeddesignationE1690;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofethanolsolubleextractives,expressedasapercentageoftheoven-driedbiomass,ofhardandsoftwoods,herbaceousmaterials(suchasswitchgrassandsericea),agriculturalresidues(suchascornstover,wheatstraw,andbagasse),andwastepaper(suchasofficewaste,boxboard,andnewsprint).Allresultsarereportedrelativetotheoven-driedweightofthesample.NOTE1—Thistestmethodmaynotbesuitableforhardandsoftwoodsamplesthatincludebarkorthosewithmorethan10%extractablematerials.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1107TestMethodforEthanol-TolueneSolubilityofWoodE1756TestMethodforDeterminationofTotalSolidsinBiomassE1757PracticeforPreparationofBiomassforComposi-tionalAnalysis3.Terminology3.1Definitions:3.1.1ethanolextractives—theresidueremainingafterevaporationoftheethanolsolvent.Thesearematerialsthatareremovedfromthebiomassbyextractionwith190proofethanol.3.1.2oven-driedweight—themoisture-freecorrectedweightofthepreparedbiomasssample.ThecorrectionfactorisdeterminedinaccordancewithTestMethodE1756.3.1.3preparedbiomass—thebiomassthathasbeenpre-paredinaccordancewithPracticeE1757.4.SignificanceandUse4.1Ethanolextractivesareanymaterialsfoundinbiomassthataresolubleinethanol.Theyarenotconsideredtobepartofthestructuralcomponentsofbiomassandsh...
