多壁碳纳米管复合物修饰的玻碳电极上镉和铅的灵敏检测

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1、法具有较高的灵敏度、选择性和重复性。石英晶体微天平(QCM)实时动态监测结果表明PDMcT在还原条件下对Cd2+SnPb2+的吸附最强。优化条件下Bi／Nafio胛DMcTRed．MWCNTs／GCE上同时检NCd2+$1]Pb2+，线性范围分别为O．05～20岭L-I和O．1"--22嵋L一，检出下限分别为O．035110．05pgL～。用于同时检测实际样品中的Cd2+$1]Pb2+，结果满意。2．制备了染料刚果红(CR)．MWCNTs和铋膜修饰的玻碳电极，基于方波溶出伏安法实现了痕量镉和铅的同时检测。QCM研究表明CR．MWCNTs／Au具有比MWCNTs／Au明

2、显更大的Cd2+和Pb2+吸附能力。优化实验条件下，Cd2+和Pb2+的线性检测范围分别为O．5～50ggL。1和O．5～70嵋L～，检出下限分别为O．1SN0．3嵋L一。用于同时检测实际水样中的Cd2+和Pb2+，结果满意。3．采用铅离子载体．MWCNTs和铋膜共同修饰的玻碳电极，基于方波溶出伏安法实现了对铅的高灵敏度、高选择性检测。QCM研究表明铅离子载体．MWCNTs对Pb2+的吸附值最大可达325mgg-1，明显高于其他几种重金属离子。优化实验条件下，Pb2+的线性范围和检出下限分别为O．3～50ggL-I和O．1峙L～。用于检测实际水样中的Pb2+，结果满意

3、。关键词：多壁碳纳米管；差分脉冲溶出伏安法；方波溶出伏安法；石英晶体微天平；Cd2+和Pb2+；PDMcT；铋；刚果红；铅离子载体。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