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1、法具有較高的靈敏度、選擇性和重復(fù)性。石英晶體微天平(QCM)實(shí)時(shí)動(dòng)態(tài)監(jiān)測(cè)結(jié)果表明PDMcT在還原條件下對(duì)Cd2+SnPb2+的吸附最強(qiáng)。優(yōu)化條件下Bi/Nafio胛DMcTRed.MWCNTs/GCE上同時(shí)檢NCd2+$1]Pb2+,線性范圍分別為O.05~20嶺L-I和O.1"--22嵋L一,檢出下限分別為O.035110.05pgL~。用于同時(shí)檢測(cè)實(shí)際樣品中的Cd2+$1]Pb2+,結(jié)果滿意。2.制備了染料剛果紅(CR).MWCNTs和鉍膜修飾的玻碳電極,基于方波溶出伏安法實(shí)現(xiàn)了痕量鎘和鉛的同時(shí)檢測(cè)。QCM研究表明CR.MWCNTs/Au具有比MWCNTs/Au明
2、顯更大的Cd2+和Pb2+吸附能力。優(yōu)化實(shí)驗(yàn)條件下,Cd2+和Pb2+的線性檢測(cè)范圍分別為O.5~50ggL。1和O.5~70嵋L~,檢出下限分別為O.1SN0.3嵋L一。用于同時(shí)檢測(cè)實(shí)際水樣中的Cd2+和Pb2+,結(jié)果滿意。3.采用鉛離子載體.MWCNTs和鉍膜共同修飾的玻碳電極,基于方波溶出伏安法實(shí)現(xiàn)了對(duì)鉛的高靈敏度、高選擇性檢測(cè)。QCM研究表明鉛離子載體.MWCNTs對(duì)Pb2+的吸附值最大可達(dá)325mgg-1,明顯高于其他幾種重金屬離子。優(yōu)化實(shí)驗(yàn)條件下,Pb2+的線性范圍和檢出下限分別為O.3~50ggL-I和O.1峙L~。用于檢測(cè)實(shí)際水樣中的Pb2+,結(jié)果滿意
3、。關(guān)鍵詞:多壁碳納米管;差分脈沖溶出伏安法;方波溶出伏安法;石英晶體微天平;Cd2+和Pb2+;PDMcT;鉍;剛果紅;鉛離子載體。IIABSTRACTHeavymetalsincludingcadmium(Cd)andlead(Pb),beingakindofthemostdangerouspollutants,havecausedgreatharmtohumanhealth.Therefore,newmethodswithspeediness,simplenessandhighsensitivityareneedfordetectionandanalysisofh
4、eavymetalsinrealsamples.Comparedwiththecommonmethodsforheavymetaldetection,theelectrochemicalanalysis,especiallyanodicstrippingvoltammetry(ASV),wasrecognizedasarapid,sensitiveandaccuratetraceanalysismethod,anddifferentialpulsestrippingvoltammetryandsquarewavestrippingvoltammetrygivetheh
5、ighestsensitivitytodetectheavymetalsandhavebecomethefocusesintherapidheavymetalsdetectionmethods.Recently,thechemicallymodifiedelectrodes(CMEs)havereceivedincreasingattentionandhavegreatlyexpandedthescopeofelectroanalyticalchemisty.Becauseofthelimitedelectrodematerials,thesensitivityand
6、repeatabilityfordetectionwaslimited.So,itisnecessaryandusefultosynthesizesomenewnanocompositestoimproveitssensitivityandrepeatability.Carbonnanotubes(Cyrs)asarelativelynewnanomaterialthatdisplayattractivestructural,electronicandmechanicalproperties,havebeenwidelyusedforanalysisanddetect
7、ion.ThusitisveryimportanttofabricateCNTsnanocompositesforheavymetalsdetermination.Inthiswork,thedetailedstudiesandanalysisonseveralCNTsnanocompositeelectrodesforCd2+andPb2+determinationarecarriedout.111emainresearchesareasfollows:1.Differentialpulseanodicstrippingvoltammetrywas