Designation:E1757−01(Reapproved2015)StandardPracticeforPreparationofBiomassforCompositionalAnalysis1ThisstandardisissuedunderthefixeddesignationE1757;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversareproduciblewaytoconverthardwoods,softwoods,herbaceousmaterials(suchasswitch-grassandsericea),agriculturalresidues(suchascornstover,wheatstraw,andbagasse),wastepaper(suchasofficewaste,boxboard,andnewsprint),feedstockspretreatedtoimprovesuitabilityforfermentationandfermentationresiduesintoauniformmaterialsuitableforcompositionalanalysis.1.2Millingandsievingactionsbothproducelargeamountsofdust.Thisdustcanbeanuisancehazardandirritant.Useappropriaterespiratoryprotectionasneeded.Ifexcessiveamountsofdustareallowedtobecomeairborneapotentialexplosionhazardispossible.Provideappropriatedustcontrolmeasuresasneeded.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Theinch-poundunitsgiveninparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E11SpecificationforWovenWireTestSieveClothandTestSieves3.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1ambientconditions—atemperatureof20to30°C(68to85°F),lessthan50%relativehumidity.3.1.2preparedbiomass—biomassthathasbeenpreparedaccordingtothispractice.4.SignificanceandUse4.1PreparationMethodA—Methodsuitablefortheprepa-rationoflargequantities(>20g)offieldcollectedsamplesintoaformappropriateforcompositionalanalysis.Woodysamplesmustfirstbeavailableaschipsofanominal5by5by0.6cm(2by2by1⁄4in.)orlessandtwigsnotexceeding0.6cm(1⁄4in.)di...
