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1、METHOD8151ACHLORINATEDHERBICIDESBYGCUSINGMETHYLATIONORPENTAFLUOROBENZYLATIONDERIVATIZATION1.0SCOPEANDAPPLICATION1.1Method8151isacapillarygaschromatographic(GC)methodfordeterminingcertainchlorinatedacidherbicidesandrelatedcompoundsinaqueous,soilandwastematrices.Specifi
2、cally,Method8151maybeusedtodeterminethefollowingcompounds:aCompoundCASNo.2,4-D94-75-72,4-DB94-82-62,4,5-TP(Silvex)93-72-12,4,5-T93-76-5Dalapon75-99-0Dicamba1918-00-9Dichloroprop120-36-5Dinoseb88-85-7MCPA94-74-6MCPP93-65-24-Nitrophenol100-02-1Pentachlorophenol87-86-5aC
3、hemicalAbstractServiceRegistryNumber1.2Becausethesecompoundsareproducedandusedinvariousforms(i.e.,acid,salt,ester,etc.),Method8151describesahydrolysisstepthatcanbeusedtoconvertherbicideestersintotheacidformpriortoanalysis.Herbicideestersgenerallyhaveahalf-lifeoflessth
4、anoneweekinsoil.1.3WhenMethod8151isusedtoanalyzeunfamiliarsamples,compoundidentificationsshouldbesupportedbyatleastoneadditionalqualitativetechnique.Sec.8.4providesgaschromatograph/massspectrometer(GC/MS)criteriaappropriateforthequalitativeconfirmationofcompoundidenti
5、fications.1.4TheestimateddetectionlimitsforeachofthecompoundsinaqueousandsoilmatricesarelistedinTable1.Thedetectionlimitsforaspecificwastesamplemaydifferfromthoselisted,dependinguponthenatureoftheinterferencesandthesamplematrix.1.5Thefollowingcompoundsmayalsobedetermi
6、nedusingthismethod:CD-ROM8151A-1Revision1December1996aCompoundCASNo.Acifluorfen50594-66-6Bentazon25057-89-0Chloramben133-90-4bDCPAdiacid2136-79-03,5-Dichlorobenzoicacid51-36-55-Hydroxydicamba7600-50-2Picloram1918-02-1aChemicalAbstractServiceRegistryNumberbDCPAmonoacid
7、anddiacidmetabolitesincludedinmethodscope;DCPAdiacidmetaboliteusedforvalidationstudies.DCPAisadimethylester.1.6Thismethodisrestrictedtousebyorunderthesupervisionofanalystsexperiencedintheuseofgaschromatographyandskilledintheinterpretationofgaschromatograms.Eachanalyst
8、mustdemonstratetheabilitytogenerateacceptableresultswiththismethod.1.7Onlyexperiencedanalystsshouldbeallowedtoworkwithdiazom
