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1、10.7.03(j)Boilingstones.—Teflon,PTFEchipsorcarborundum,No.12AOACOfficialMethod992.32granules(heatgranules30minat400°Cinmufflefurnace,cool,andChlorinatedAcidicPesticideResiduesstoreindesiccator).inFinishedDrinkingWater(k)Waterbath.—Heated,capableofcontrol±2°C.UsebathinGasChromatographicMethodhoo
2、d.UsingElectronCaptureDetector(l)Balance.—Analytical,capableofaccuratelyweighingtonearestFirstAction19920.0001g.FinalAction1995(m)Diazomethanegenerator.—Usingthree20´150mmtubes,[Applicabletoquantitativedeterminationofresiduesof12chlori-Neoprenerubberstopperstofittubes,5mmod´3mmidglasstub-nateda
3、cidicpesticides,inlowppbrange,in(ng/mL)finisheddrinkinging,andnitrogen(ultrahighpurity)asinFigure992.32AorB.water.]Cooldiazomethanecollectorinicebathorcryogenicallycooledvessel.SeeTable992.32Afortheresultsofinterlaboratorystudy.(n)Glasswool.—Acidwashandheat4hat450°C.Methodisacceptableforquantit
4、ativedeterminationofresiduelev-(o)GCsystem.—Temperature-programmablesystemforusewithelsofbentazon,2,4-D,2,4-DB,3,5-dichlorobenzoicacid,capillarycolumns,includingsyringes,analyticalcolumns,gases,de-DCPA-diacid,dicamba,dichlorprop,5-hydroxydicamba,tector,andstripchartrecorder.Datasystemisrecommen
5、dedformea-pentachlorophenol,picloram,2,4,5-T,and2,4,5-TP.suringpeakareas.Primarycolumn:30m´0.25mmid5%phenyl–95%methylpolysiloxanefused-silicacapillarycolumn,A.Principle0.25mmfilmthickness.Confirmationcolumn:30m´0.25mmidLaboratorysamplesaretreatedwithsodiumhydroxidetohydro-14%cyanopropylphenyl–8
6、6%methylpolysiloxanefused-silicacap-lyzeestersofanalytes,washedwithsolventtoremoveextraneousillarycolumn,0.25mmfilmthickness.Operatingconditions:injectionorganicmaterial,andacidified.Chlorinatedacidsareetherextractedvolume2mLsplitlesswith45sdelay;Hecarriergas30cm/slinearve-andconvertedtomethyle
7、stersusingdiazomethane.Excesslocity;injector250°C;detector320°C;ovenprogrammedfromderivatizingreagentisremovedbysolventwashandactivatedmag-60–300°Cat4°C/min;ECD.SeeTable992.32Bfortypicalnesiumsilicatecleanupcolumn.Estersaredetermi
