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RoHS样品微波消解预处理方法.docx

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RoHS样品微波消解预处理方法 Introduction: TheRestrictionofHazardousSubstances(RoHS)directivewasintroducedintheEuropeanUnionin2006inordertominimizetheuseofhazardouschemicalsinelectronicandelectricalequipment.Thedirectiverestrictstheuseofcertainhazardoussubstancesincludinglead,mercury,cadmium,hexavalentchromium,polybrominatedbiphenyls(PBBs),andpolybrominateddiphenylethers(PBDEs)inelectronicandelectricalproducts.TheRoHScomplianceismandatoryforallproductsbeingsoldintheEuropeanUnion.TheimplementationoftheRoHSdirectivehasledtothedevelopmentanduseofnew,safertechnologiesthatenabletheuseofalternativematerialsinelectronicproducts. OneofthekeychallengesintheRoHSregulationsistheneedforaccurateandpreciseanalysisoftheserestrictedsubstancesinelectronicandelectricalproducts.Microwavedigestionisanefficientandeffectivesamplepreparationtechniquethatcanbeutilizedforthedigestionofvarioussamplesinordertoquantifythelevelsoftheserestrictedsubstances.Inthispaper,wewilldiscussthemicrowavedigestionsamplepreparationmethodforRoHScompliancetesting. Microwavedigestionsamplepreparationmethod: Microwavedigestionisasamplepreparationtechniquethatisusedtoextractanalytesfromavarietyofsamples.Inthistechnique,samplesaredigestedorbrokendownintotheirconstituentpartsusingacidsandheat.Thedigestedsampleisthenanalyzedusingvariousanalyticalmethodssuchasinductivelycoupledplasmamassspectrometry(ICP-MS)oratomicabsorptionspectroscopy(AAS).MicrowavedigestionisapreferredtechniqueforRoHScompliancetestingbecauseitisfast,accurate,andproduceshigh-qualityanalyticaldata. Themicrowavedigestionsamplepreparationmethodinvolvesthefollowingsteps: Step1:Samplepreparation Thefirststepinthesamplepreparationprocessinvolvescollectingthesampletobeanalyzed.Thesampleshouldbecollectedinaccordancewiththerelevantstandardsandregulations.Thesampleshouldbecleanedanddriedpriortodigestiontoremoveanycontaminantsthatmayaffecttheanalysis. Step2:Digestion Oncethesamplehasbeencollectedandprepared,itshouldbedigestedusingamicrowavedigestionsystem.Thesampleisplace