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1、TopicsinSolid-PhaseExtraction:MetalsAnalysisIonExchangeSorbentsforMetalsExtraction-Analysis&SorbentUseSelectionGuide?UCTENVIRO-CLEAN(Ion-ExchangeCartridges)*January5,2010Thedeterminationoftracemetalsinaqueousenvironmentalsamplesorothermatricesoftenrequiresamplepretreat
2、mentandcleanupprocedurespriortoanalysisbyusingspecificion-exchangesorbents.Thesorbentsareusedtoeliminatematrixinterferencesandachievehighconcentrationsofmetalionsforgoodanalyticalaccuracy.TheyareimportantwhenusingsuchtechniquesasAA,IESandICP-AES.Theuseofion-exchangesor
3、bentsforthepreconcentration,separationanddeterminationofmetalionsfortraceanalysisiswellestablishedintheliterature.Selectionofanappropriatesorbentensuresbothhighefficiencyinmetalchelatingwhileminimizingthemassofsorbentrequiredforaparticularanalyticaltask.Ahighefficiency
4、sorbentmeansthatasmallerbedmassmaybeusedtherebyreducingthequantityofsolventrequiredforelutionyieldinggreateranalyticalsensitivity.Recommendationsinthisapplicationnoteincludethefollowingmetalions:Zinc(II)Arsenic(V)Tin(IV)SelenousIV)Mercury(II)Chromium(III)Copper(II)Plat
5、inum(0)Othermetalionsmaybeextractedbytheuseoftheseion-exchangesorbentsSorbentSelectionforMetalsExtractionSolid-phasesorbentshavedifferingcapacityandselectivityforvariousmetalionsduetothespecificnatureoftheion-exchangefunctionalgroup,themetalspeciesandthevalencestateoft
6、hemetalofinterest.Dependingonthespecificmetalionofinterest,elutionofthecartridgemaybemostefficientusingboththeacidfollowedbythebaseelutionprocedure.ThiscanbedeterminedbylookingatthefollowingExtractionProtocolTables.Forexample,whenelutingHg(II)fromPSAthehighestrecoveryi
7、sobtainedusingacidelution(greenbox)followedbybaseelution(yellowbox).SampleAnalysis1)SampleExtractiona)Assembleanallglassextractionapparatus?b)PlaceaUCTENVIRO-CLEANcartridgeontheapparatusNote:Cartridgeselectionwilldependonthevolumeofsampleortheconcentrationofmetaltobeex
8、tractedc)Condition1mLcartridgebyadding3mLofmethanol.(Largercartridgeswillrequirealargervolumeofsolventandwaterwashvol
