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1、METHOD1312SYNTHETICPRECIPITATIONLEACHINGPROCEDURE1.0SCOPEANDAPPLICATION1.1Method1312isdesignedtodeterminethemobilityofbothorganicandinorganicanalytespresentinliquids,soils,andwastes.2.0SUMMARYOFMETHOD2.1Forliquidsamples(i.e.,thosecontaininglessthan0.5%drysolidmaterial),thesamp
2、le,afterfiltrationthrougha0.6to0.8µmglassfiberfilter,isdefinedasthe1312extract.2.2Forsamplescontaininggreaterthan0.5%solids,theliquidphase,ifany,isseparatedfromthesolidphaseandstoredforlateranalysis;theparticlesizeofthesolidphaseisreduced,ifnecessary.Thesolidphaseisextractedwi
3、thanamountofextractionfluidequalto20timestheweightofthesolidphase.Theextractionfluidemployedisafunctionoftheregionofthecountrywherethesamplesiteislocatedifthesampleisasoil.Ifthesampleisawasteorwastewater,theextractionfluidemployedisapH4.2solution.Aspecialextractorvesselisusedw
4、hentestingforvolatileanalytes(seeTable1foralistofvolatilecompounds).Followingextraction,theliquidextractisseparatedfromthesolidphasebyfiltrationthrougha0.6to0.8µmglassfiberfilter.2.3Ifcompatible(i.e.,multiplephaseswillnotformoncombination),theinitialliquidphaseofthewasteisadde
5、dtotheliquidextract,andtheseareanalyzedtogether.Ifincompatible,theliquidsareanalyzedseparatelyandtheresultsaremathematicallycombinedtoyieldavolume-weightedaverageconcentration.3.0INTERFERENCES3.1Potentialinterferencesthatmaybeencounteredduringanalysisarediscussedintheindividua
6、lanalyticalmethods.4.0APPARATUSANDMATERIALS4.1Agitationapparatus:Theagitationapparatusmustbecapableofrotatingtheextractionvesselinanend-over-endfashion(seeFigure1)at30+2rpm.SuitabledevicesknowntoEPAareidentifiedinTable2.4.2ExtractionVessels4.2.1ZeroHeadspaceExtractionVessel(ZH
7、E).Thisdeviceisforuseonlywhenthesampleisbeingtestedforthemobilityofvolatileanalytes(i.e.,thoselistedinTable1).TheZHE(depictedinFigure2)allowsforliquid/solidseparationwithinthedeviceandeffectivelyprecludesheadspace.Thistypeofvesselallowsforinitialliquid/solidCD-ROM1312-1Revisio
8、n0September1994separation,extraction,andfinalextractfiltratio
