Designation:D7026−13StandardGuideforSamplingandReportingofResultsforDeterminationofPercentBiobasedContentofMaterialsviaCarbonIsotopeAnalysis1ThisstandardisissuedunderthefixeddesignationD7026;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONThebiobasedcontentofamaterialandtheresourcesconsumedincreationofthematerial,bothenergyandrawmaterialsaredefinedinGuideD6852.Theseresourcesareexpressedascarbonequivalent.PercentBiobasedCarbonContentrepresentsneworrecentlyfixedcarbon,opposedtofossilcarbonfixedmillionsofyearsago.TestMethodsD6866presentstwomethodsforexperimen-tallydeterminingthepercentageofrecentlyfixedcarboninasamplebymeansofitsradioisotopecontent,allowingdirectdeterminationofitsbiobasedcontent.ThefollowingguiderepresentsacompaniondocumenttoTestMethodsD6866anddefinesthesamplingandsamplehandlingproceduresfortheradioisotopemethodsfordeterminationofbiobasedcontent.Thereareagreatvarietyofbiobasedmaterialsthatmaybetestedusingoneoftheradioisotopemethods,withawiderangeofphysicalcharacteristicsandspecialsamplingproblems.Itisnottheintentofthisguidetoprovidespecificsamplecollectionandhandlinginstructionsforaspecificmaterial.Rather,theguidepresentsgeneraloutlinestobefollowedinsamplingproceduresandencouragestheuseofexistingmaterial-specificsamplingproceduresvalidatedbyextensiveuseinindustry.Theemphasisintheguideistoprovidethoroughandtransparentreportingthatallowssubsequentevaluationofthevalidityoftheclaimsregardsbiobasedcontent.1.Scope1.1ThisguideprovidesaframeworkforcollectingandhandlingsamplesfordeterminationofbiobasedcontentofmaterialsbymeansofthecarbonisotopemethoddescribedinTestMethodsD6866.Testsforsamplingadequacybasedonthestandardstatisticaltoolsareprovided.Inaddition,reportingoftheresults,includingsamplingtechniquesandhandlingproceduresandchain-of-cus...
