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1、METHOD9020BTOTALORGANICHALIDES(TOX)1.0SCOPEANDAPPLICATION1.1Method9020determinesTotalOrganicHalides(TOX)aschlorideindrinkingwaterandgroundwaters.Themethodusescarbonadsorptionwithamicrocoulometric-titrationdetector.1.2Method9020detectsallorganichalidescontainingchlorine,bromine,an
2、diodinethatareadsorbedbygranularactivatedcarbonundertheconditionsofthemethod.Fluorine-containingspeciesarenotdeterminedbythismethod.1.3Method9020isapplicabletosampleswhoseinorganic-halideconcen-trationdoesnotexceedtheorganic-halideconcentrationbymorethan20,000times.1.4Method9020d
3、oesnotmeasureTOXofcompoundsadsorbedtoundissolvedsolids.1.5Method9020isrestrictedtouseby,orunderthesupervisionof,analystsexperiencedintheoperationofapyrolysis/microcoulometerandintheinterpretationoftheresults.1.6Thismethodisprovidedasarecommendedprocedure.Itmaybeusedasareferencefo
4、rcomparingthesuitabilityofothermethodsthoughttobeappropriateformeasurementofTOX(i.e.,bycomparisonofsensitivity,accuracy,andprecisionofdata).2.0SUMMARYOFMETHOD2.1Asampleofwaterthathasbeenprotectedagainstthelossofvolatilesbytheeliminationofheadspaceinthesamplingcontainer,andthatisf
5、reeofundissolvedsolids,ispassedthroughacolumncontaining40mgofactivatedcarbon.ThecolumniswashedtoremoveanytrappedinorganichalidesandisthencombustedtoconverttheadsorbedorganohalidestoHX,whichistrappedandtitratedelectrolyticallyusingamicrocoulometricdetector.3.0INTERFERENCES3.1Metho
6、dinterferencesmaybecausedbycontaminants,reagents,glassware,andothersample-processinghardware.Allthesematerialsmustberoutinelydemonstratedtobefreefrominterferencesundertheconditionsoftheanalysisbyrunningmethodblanks.3.1.1Glasswaremustbescrupulouslycleaned.Cleanallglasswareassoonas
7、possibleafterusebytreatingwithchromatecleaningsolution.Thisshouldbefollowedbydetergentwashinginhotwater.Rinsewithtapwateranddistilledwateranddraindry;glasswarewhichisnotvolumetricshould,inaddition,beheatedinamufflefurnaceat400ECCD-ROM9020B-1Revision2September1994for15to30min.(Vol
8、umetricwareshouldnotbeheatedinamufflefur
