Designation:D8431−22StandardTestMethodforDetectionofWater-solublePetroleumOilsbyA-TEEMOpticalSpectroscopyandMultivariateAnalysis1ThisstandardisissuedunderthefixeddesignationD8431;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthe(1)detectionoftracelevel(µg/Lrange)ofoilandpetroleum(water-solublefraction)pollutantsinsurfaceandgrounddrinkingwatersources,(2)identificationofthecompounds,and(3)alertinganalystswithacontaminantconcentrationprediction.Thistestmethodfacilitatesidentificationandquantificationfrom20to1000µg/Loftargetcontaminants,including:water-solublefractionofaromaticcompoundsfromtheBTEXfamily(benzene,toluene,ethylbenzene,andxylenes)andnaphthalenefromthepolycyclicaromatichydrocarbon(PAH)group,referredtoasBTEXNinthistestmethod,inwatersampleswithupto15mg/Lofdissolvedorganiccarbon(DOC).Themainapproachinvolvesanalyzingandcharacterizingkeywaterintakeloca-tionsbeforethetreatmentanddevelopingthecontaminantlibrary.Thewater-soluble(BTEXN)contaminantsareassoci-atedwith,butnotlimitedtopetroleumoilsandfuelsincludingcommercialdieselfuel,gasoline,kerosene,heavyoil,fueloilandlubricateoil,etc.1.2Thedatasetsareanalyzedusingmultivariatemethodstotestcontaminantidentificationandquantification.Themulti-variatemethodsincludeclassificationandregressionalgo-rithmstoanalyzefluorescenceEEMdataacquiredinthelaboratory.Thecommongoalofthesealgorithmsistoreducemultidimensionalityandeliminatenoiseoffluorescenceandbackgroundsignals.Automatedidentification-quantificationmethodslinkeddirectlytotheinstrumentacquisition-analysissoftwarearecommerciallyavailable.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itist...
