Designation:D7203−11(Reapproved2017)StandardPracticeforScreeningTrichloroethylene(TCE)-ContaminatedMediaUsingaHeatedDiodeSensor1ThisstandardisissuedunderthefixeddesignationD7203;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticedescribesproceduresforscreeningmediaknowntocontainthehalogenatedvolatileorganiccompound(HVOC),trichloroethylene(TCE).ProcedureAistobeusedforscreeningsoilknowntocontainTCEandProcedureBistobeusedforscreeningwaterknowntocontainTCE.1.1.1BothProceduresAandBinvolvemeasuringtheTCEconcentrationintheheadspaceaboveasampleusingaheateddiodesensordevice.Fromthismeasurement,anestimatedconcentrationofTCEinthesamplecanbedetermined.AnyTCEremaininginthesampleisnotmeasured.AnyotherHVOCpresentinthesamplewillbereportedasTCE.1.2ProcedureAcanalsobeusedforscreeningthehead-spaceaboveasoilsuspectedofcontainingHVOCcontamina-tiontoindicatethepresenceorabsenceofHVOCcontamina-tioninthesoil.ProcedureBcanalsobeusedforscreeningtheheadspaceaboveawatersuspectedofcontainingHVOCcontaminationtoindicatethepresenceorabsenceofHVOCcontaminationinthewater.Forbothprocedures,anyHVOCcontaminationremaininginthesoilorwaterisnotdetectedbythispractice.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3.1Exception—Certaininch-poundunitsareprovidedforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,healthandenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.NOTE1—Thediodesensorisheatedtotemperaturesrangingbetweenapproximately600and1000°C(see6.1.5)andasaresultcouldbeasourceofignition.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternat...
