EPA METHOD 625—BASE NEUTRALS AND ACIDS

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1、APPENDIXATOPART136METHODSFORORGANICCHEMICALANALYSISOFMUNICIPALANDINDUSTRIALWASTEWATERMETHOD625ÐBASE/NEUTRALSANDACIDS1.ScopeandApplication1.1Thismethodcoversthedeterminationofanumberoforganiccompoundsthatarepartitionedintoanorganicsolventandareamenabletogaschroma

2、tography.TheparameterslistedinTables1and2maybequalitativelyandquantitativelydeterminedusingthismethod.1.2ThemethodmaybeextendedtoincludetheparameterslistedinTable3.Benzidinecanbesubjecttooxidativelossesduringsolventconcentration.Underthealkalineconditionsoftheex

3、tractionstep,"-BHC,(-BHC,endosulfanIandII,andendrinaresubjecttodecomposition.Hexachlorocyclopentadieneissubjecttothermaldecompositionintheinletofthegaschromatograph,chemicalreactioninacetonesolution,andphotochemicaldecomposition.N-nitrosodimethylamineisdifficult

4、toseparatefromthesolventunderthechromatographicconditionsdescribed.N-nitrosodiphenylaminedecomposesinthegaschromatographicinletandcannotbeseparatedfromdiphenylamine.ThepreferredmethodforeachoftheseparametersislistedinTable3.2,141.3Thisisagaschromatographic/masss

5、pectrometry(GC/MS)methodapplicabletothedeterminationofthecompoundslistedinTables1,2,and3inmunicipalandindustrialdischargesasprovidedunder40CFRPart136.1.11.4Themethoddetectionlimit(MDL,definedinSection16.1)foreachparameterislistedinTables4and5.TheMDLforaspecificw

6、astewatermaydifferfromthoselisted,dependinguponthenatureofinterferencesinthesamplematrix.1.5Anymodificationtothismethod,beyondthoseexpresslypermitted,shallbeconsideredasamajormodificationsubjecttoapplicationandapprovalofalternatetestproceduresunder40CFRParts136.

7、4and136.5.Dependinguponthenatureofthemodificationandtheextentofintendeduse,theapplicantmayberequiredtodemonstratethatthemodificationswillproduceequivalentresultswhenappliedtorelevantwastewaters.1.6Thismethodisrestrictedtousebyorunderthesupervisionofanalystsexper

8、iencedintheuseofagaschromatograph/massspectrometerandintheinterpretationofmassspectra.Eachanalystmustdemonstratetheabilitytogenerateacceptableresultswiththismethodusi