Designation:D8018−15StandardTestMethodforDeterminationof(Tri-n-butyl)-n-tetradecylphosphoniumchloride(TTPC)inSoilbyMultipleReactionMonitoringLiquidChromatography/MassSpectrometry(LC/MS/MS)1ThisstandardisissuedunderthefixeddesignationD8018;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisprocedurecoversthedeterminationof(Tri-n-butyl)-n-tetradecylphosphoniumchloride(TTPC)inasoilmatrixbyextractionwithacetone,filtration,dilutionwithwater,andanalysisbyliquidchromatography/tandemmassspectrometry.TTPCisabiocidethatstronglyadsorbstosoils.2Thesampleextractsarepreparedinasolutionof75%acetoneand25%waterbecauseTTPChasanaffinityforsurfacesandparticles.Thereportingrangeforthismethodisfrom250to10000ng/kg.Thisanalyteisqualitativelyandquantitativelydeterminebythismethod.Thismethodadherestomultiplereactionmonitoring(MRM)massspectrometry.1.2TheMethodDetectionLimit(Note1)(MDL)andReportingRange(Note2)forthetargetanalytearelistedinTable1.NOTE1—TheMDLisdeterminedfollowingtheCodeofFederalRegulations,40CFRPart136,AppendixB,asaguideutilizingsolventextractionofsoil.Two-gramsampleofOttawaSandwasutilized.AdetailedprocessdeterminingtheMDLisexplainedinthereferenceandisbeyondthescopeofthisstandardtobeexplainedhere.NOTE2—ReportingrangeconcentrationiscalculatedfromTable2concentrationsassuminga50µLinjectionoftheLevel1calibrationstandardforTTPC,andthehighestlevelcalibrationstandardwitha20mLfinalextractvolumeofa2gsoilsample.Volumevariationswillchangethereportinglimitandranges.1.2.1Thereportinglimitinthistestmethodistheminimumvaluebelowwhichdataaredocumentedasnon-detects.Ana-lytedetectionsbetweenthemethoddetectionlimitandthereportinglimitareestimatedconcentrationsandarenotre-portedfollowingthistestmethod.ThereportinglimitiscalculatedfromtheconcentrationoftheLevel1calibrationstan...
