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1、10.6.10sprouts,cauliflower,cabbage,cherries,cranberries,AOACOfficialSurplusMethod960.41igrapes,lettuce,peapods,spinach,squash,tomatoes,DDTPesticidesResiduessilage,etc.—Finelychop1kgsampleorentirecontentsofsmallunitpackageinsuitablefoodchopper(poweredmech.foodchoppersuchasHob
2、artisColorimetricMethodsatisfactory)andtransferwellmixed100gportiontohigh-speedblender.Add100mLisopropanolandblendFirstAction19602min.Add200mLhexaneorbenzeneandblendagainFinalAction19652min.(Toavoidsplashingandpossiblelossofsample,Surplus1980regulateblendingspeedwithrheostat
3、orvariabletransformerwhennecessary.)13thed.Pourmixt.ascompletelyaspossibleinto600–800mLbeakerandletsolidssettle.Poursolv.layerequally29.097Principleintotwo250mLcentrf.bottles.Withaidofstirringrodandfunnel,distributesolidmaterialequallybetweentheComDDTconsistsessentiallyof2is
4、omers,p,pN-and2bottles.Stopperandcentrf.5minatca1500rpm.Ifo,pN-DDT,inproportionofca3:1.DryisomersofDTsolidspackfirmlydecantsupernatedirectlyinto500canbenitratedtotetranitroDDT,whichcanbeextdbymLvol.flask.Ifsolidspackloosely,transferliq.thruether,dried,andtakenupinmeasuredvol
5、.benzene.siphontube,947.07(See33.6.13),Notes.WashblenderTreatingthissolnwithstdzdanhyd.NaOMesolncup,cap,andbeakerwithtwo100mLportionsproducesreasonablystablecolors—blueforp,pNandisopropanol-hexaneor-benzene(1+2).Distributereddishpurpleforo,pNisomer.Thisreactionwashingsequall
6、ybetweenthe2bottles.Breakupsolid(Schechter-Haller)isfairlyspecificforDDT.materialwithstirringrod,stopperbottles,andshakeExceptionsarenitratedordehalogenateddecompositionvigorously2min.Centrf.asbeforeandaddsolv.layerproductsofDDTandcertaincloseanalogsthatcantovol.flask.Dil.to
7、vol.withisopropanol-hexaneor-produceyellowtoredandsometimesbluecolorswithbenzene(1+2).(Finalsolnshouldbeclear.)NaOMe.Ifdistinctly"off"colorsareproducedon(b)Forhay,cured(dry).—Chop1kgsampleandsamplesofunknownsprayhistoryandcannotbemixwell.GrindportioninWileyorothermilltoca20r
8、emovedfromsolv.bycarefulwashingwithalkali,mesh.analogsmaybepresent,andspeci
