Designation:D5790−95(Reapproved2012)StandardTestMethodforMeasurementofPurgeableOrganicCompoundsinWaterbyCapillaryColumnGasChromatography/MassSpectrometry1ThisstandardisissuedunderthefixeddesignationD5790;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverstheidentificationandsimulta-neousmeasurementofpurgeablevolatileorganiccompounds.Ithasbeenvalidatedfortreateddrinkingwater,wastewater,andgroundwater.Thistestmethodisnotlimitedtotheseparticularaqueousmatrices;however,theapplicabilityofthistestmethodtootheraqueousmatricesmustbedemonstrated.1.2Thistestmethodisapplicabletoawiderangeoforganiccompoundsthathavesufficientlyhighvolatilityandlowwatersolubilitytobeefficientlyremovedfromwatersamplesusingpurgeandtrapprocedures.Table1liststhecompoundsthathavebeenvalidatedforthistestmethod.ThistestmethodisnotlimitedtothecompoundslistedinTable1;however,theapplicabilityofthetestmethodtoothercompoundsmustbedemonstrated.1.3Analyteconcentrationsuptoapproximately200µg/Lmaybedeterminedwithoutdilutionofthesample.Analytesthatareinefficientlypurgedfromwaterwillnotbedetectedwhenpresentatlowconcentrations,buttheycanbemeasuredwithacceptableaccuracyandprecisionwhenpresentinsuffi-cientamounts.1.4Analytesthatarenotseparatedchromatographically,butthathavedifferentmassspectraandnoninterferingquantitationions,canbeidentifiedandmeasuredinthesamecalibrationmixtureorwatersample.Analytesthathaveverysimilarmassspectracannotbeindividuallyidentifiedandmeasuredinthesamecalibrationmixtureorwatersampleunlesstheyhavedifferentretentiontimes.Coelutingcompoundswithverysimilarmassspectra,suchasstructuralisomers,mustbereportedasanisomericgrouporpair.Twoofthethreeisomericxylenesareexamplesofstructuralisomersthatmaynotberesolvedonthecapillarycolumn,andifnot,mustbereportedasanisomer...
