Designation:E2838−11StandardTestMethodforDeterminationofThiodiglycolonWipesbySolventExtractionFollowedbyLiquidChromatography/TandemMassSpectrometry(LC/MS/MS)1ThisstandardisissuedunderthefixeddesignationE2838;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisproceduredetailsthedeterminationofthiodiglycol(TDG),alsoknownas2,2’-thiobis-ethanol,onwipeswith3,3’-thiodipropanol(TDP)asthesurrogate.Thismethodisbaseduponsolventextractionofwipesbyeithersonicationorapressurizedfluidextraction(PFE)techniqueasanalternativeoption.Theextractisfiltered,concentratedandanalyzedbyliquidchromatography/tandemmassspectrometry(LC/MS/MS).TDGisqualitativelyandquantitativelydetermined.1.2Units—ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3TheMethodDetectionLimit(MDL)2andReportingRange3forTDGarelistedinTable1.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:4D653TerminologyRelatingtoSoil,Rock,andContainedFluidsD1193SpecificationforReagentWaterD3694PracticesforPreparationofSampleContainersandforPreservationofOrganicConstituentsD3740PracticeforMinimumRequirementsforAgenciesEngagedinTestingand/orInspectionofSoilandRockasUsedinEngineeringDesignandConstructionE2554PracticeforEstimatingandMonitoringtheUncer-taintyofTestResultsofaTestMethodinaSingleLaboratoryUsingaControlSampleProgram2.2OtherDocuments:EPAPublicationSW-846TestMethodsforEvaluatingSolidWaste,Physical/ChemicalMethods5TheCodeofFederalRegulations,40CFRPart136,Appen-dixB3.Terminology3.1Abbreviations:3.1.1mM—millimolar,1×10-3moles/L3...
