Designation:E1790−04(Reapproved2010)StandardPracticeforNearInfraredQualitativeAnalysis1ThisstandardisissuedunderthefixeddesignationE1790;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoverstheuseofnear-infrared(NIR)spectroscopyforthequalitativeanalysisofliquidsandsolids.ThepracticeiswrittenundertheassumptionthatmostNIRqualitativeanalyseswillbeperformedwithinstrumentsde-signedspecificallyforthisregionandequippedwithcomput-erizeddatahandlingalgorithms.Inprinciple,however,thepracticealsoappliestoworkwithliquidsamplesusinginstrumentsdesignedforoperationovertheultraviolet(UV),visible,andmid-infrared(IR)regionsifsuitabledatahandlingcapabilitiesareavailable.ManyFourierTransformInfrared(FTIR)(normallyconsideredmid-IRinstruments)haveNIRcapability,oratleastextended-rangebeamsplittersthatallowoperationto1.2µm;thispracticealsoappliestodatafromtheseinstruments.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E131TerminologyRelatingtoMolecularSpectroscopyE1252PracticeforGeneralTechniquesforObtainingInfra-redSpectraforQualitativeAnalysisE1655PracticesforInfraredMultivariateQuantitativeAnalysis3.Terminology3.1Definitions—Fordefinitionsofgeneraltermsandsym-bolspertainingtoNIRspectroscopyandstatisticalcomputations,refertoTerminologyE131.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1interactance,n—thephenomenonwherebyradiantenergyenteringthesurfaceofamaterialisscatteredbythematerialbacktothesurface,butatadifferentpor...
