Designation:D7968−14StandardTestMethodforDeterminationofPerfluorinatedCompoundsinSoilbyLiquidChromatographyTandemMassSpectrometry(LC/MS/MS)1ThisstandardisissuedunderthefixeddesignationD7968;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisprocedurecoversthedeterminationofselectedperfluorinatedcompounds(PFCs)inasoilmatrixusingsolventextraction,filtration,followedbyliquidchromatography(LC)anddetectionwithtandemmassspectrometry(MS/MS).Theseanalytesarequalitativelyandquantitativelydeterminedbythismethod.Thismethodadherestomultiplereactionmonitoring(MRM)massspectrometry.ThisprocedureutilizesaquickextractionandisnotintendedtogenerateanexhaustiveaccountingofthecontentofPFCsindifficultsoilmatrices.Anexhaustiveextractionprocedureforpolyfluoralkylsubstances,suchaspublishedbyWashingtonetal.2,fordifficultmatricesshouldbeconsideredwhenanalyzingPFCs.1.2Units—ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3TheMethodofDetectionLimit3andReportingRange4forthetargetanalytesarelistedinTable1.1.3.1Thereportinglimitinthistestmethodistheminimumvaluebelowwhichdataaredocumentedasnon-detects.Ana-lytedetectionsbetweenthemethoddetectionlimitandthereportinglimitareestimatedconcentrationsandarenotre-portedfollowingthistestmethod.Inmostcases,thereportinglimitiscalculatedfromtheconcentrationoftheLevel1calibrationstandardasshowninTable2fortheperfluorinatedcompoundsaftertakingintoaccounta2gsampleweightandafinalextractvolumeof10mL,50%water/50%MeOHwith0.1%aceticacid.Thefinalextractvolumeisassumedtobe10mLbecause10mLof50%water/50%MeOHwith0.1%aceticacidwasaddedtoeachsoilsampleandonlytheliquidlayerafterextractionisfilteredleavingthesolidandanyresidualsolventbehind.ItisraisedabovetheLevel1calibra-tionconcentrationforPFOS,PFHxA,F...
