Designation:D4128−06(Reapproved2012)StandardGuideforIdentificationandQuantitationofOrganicCompoundsinWaterbyCombinedGasChromatographyandElectronImpactMassSpectrometry1ThisstandardisissuedunderthefixeddesignationD4128;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguidecoverstheidentificationandquantitationoforganiccompoundsbygaschromatography/massspectrometry(GC-MS)(electronimpact)thatarepresentorextractedfromwaterandarecapableofpassingthroughagaschromatographwithoutalteration.Theguideisintendedprimarilyforsolu-tionsforwhich1ngormoreofanycomponentofinterestcanbeintroducedontoagaschromatographiccolumn.Thisguidehastheadvantageofprovidingtentativeidentificationsofvolatileandsemi-volatileorganics,butisrestrictedto(a)compoundsforwhichreferencespectracanbeobtainedand(b)compoundsthatcanbeseparatedbygaschromatography(GC).Theserestrictionsareimposedontheguide,butarenotalimitationofthetechnique.Theguideiswrittenfor,butnotrestrictedto,analysisusingautomateddataacquisitionandhandling.1.2GuidelineshavebeenincludedforquantitationusingASTMTestMethodsD3871,D3973,andotherGC-MSvolatile/semivolatileproceduresusedforenvironmentalanaly-sis2.Adetectionamountof1ngcanonlybeconsideredapproximate.Theactualdetectionlimitsforeachcomponentmustbedeterminedineachlaboratory.Actualdetectionamountswillvarywiththecomplexityofthematrix,thekindandconditionoftheGC-MSsystem,thesamplepreparationtechniquechosen,andtheapplicationofcleanuptechniquestothesampleextract,ifany.Lowerlevelsofdetectioncanbeachievedusingmodernsensitiveinstrumentsorwithselectedionmonitoring(SIM).Todeterminetheinterlaboratorydetec-tionestimate(IDE)andtheinterlaboratoryquantitationesti-mate(IQE),followPracticesD6091andD6512.1.3Theguideisapplicabletotheidentificationofmanyorganicconstituentsofnaturalandtreatedwat...
