By usingtheexperimentaldesign(DoE)technique,weoptimizedananalyticalmethodforthede- termination ofmercuryisotoperatiosbymeansofcold-vapormulticollectorICP-MS(CV-MC-ICP-MS)to provideabsoluteHgisotopicratiomeasurementswithasuitableinternalprecision.Byrunning32ex- periments, theinfluence ofmercuryandthalliuminternalstandardconcentrations,totalmeasuringtime and sample flow ratewasevaluated.MethodwasoptimizedvaryingHgconcentrationbetween2and 20 ngg1. Themodel finds outsomecorrelationswithintheparametersaffectthemeasurementspre- cision andpredictssuitablesamplemeasurementprecisionsforHgconcentrationsfrom5ngg1 Hg upwards. The methodwassuccessfullyappliedtosamplesofManilaclams(Ruditapes philippinarum) coming from theMaranoandGradolagoon(NEItaly),acoastalenvironmentaffectedbylongtermmercury contamination mainlyduetominingactivity.Resultsshowdifferentextentsofbothmassdependent fractionation (MDF)andmassindependentfractionation(MIF)phenomenainclamsaccordingtotheir size andsamplingsitesinthelagoon.Themethodis fit fordeterminationsonrealsamples,allowingfor the useofHgisotopicratiostostudymercurybiogeochemicalcyclesincomplexecosystems.
DoE optimizationofamercuryisotoperatiodeterminationmethodfor environmentalstudies / Berni, Alex; Baschieri, Carlo; Covelli, Stefano; Emili, Andrea; Marchetti, Andrea; Manzini, Daniela; Berto, Daniela; Rampazzo, Federico. - In: TALANTA. - ISSN 0039-9140. - (2016), pp. 179-187.
DoE optimizationofamercuryisotoperatiodeterminationmethodfor environmentalstudies
BERNI, ALEX;BASCHIERI, CARLO;MARCHETTI, Andrea;MANZINI, Daniela;
2016
Abstract
By usingtheexperimentaldesign(DoE)technique,weoptimizedananalyticalmethodforthede- termination ofmercuryisotoperatiosbymeansofcold-vapormulticollectorICP-MS(CV-MC-ICP-MS)to provideabsoluteHgisotopicratiomeasurementswithasuitableinternalprecision.Byrunning32ex- periments, theinfluence ofmercuryandthalliuminternalstandardconcentrations,totalmeasuringtime and sample flow ratewasevaluated.MethodwasoptimizedvaryingHgconcentrationbetween2and 20 ngg1. Themodel finds outsomecorrelationswithintheparametersaffectthemeasurementspre- cision andpredictssuitablesamplemeasurementprecisionsforHgconcentrationsfrom5ngg1 Hg upwards. The methodwassuccessfullyappliedtosamplesofManilaclams(Ruditapes philippinarum) coming from theMaranoandGradolagoon(NEItaly),acoastalenvironmentaffectedbylongtermmercury contamination mainlyduetominingactivity.Resultsshowdifferentextentsofbothmassdependent fractionation (MDF)andmassindependentfractionation(MIF)phenomenainclamsaccordingtotheir size andsamplingsitesinthelagoon.Themethodis fit fordeterminationsonrealsamples,allowingfor the useofHgisotopicratiostostudymercurybiogeochemicalcyclesincomplexecosystems.
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