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1、中山大學(xué)碩士學(xué)位論文催化動(dòng)力學(xué)光度法測(cè)定痕量鉻和釩的研究姓名:沈淑君申請(qǐng)學(xué)位級(jí)別:碩士專(zhuān)業(yè):分析化學(xué)指導(dǎo)教師:鄒小勇20090609pg/mL,檢出限為2.7x10"mg/mE。。將此體系應(yīng)用于水樣及土壤樣品中鉻的測(cè)定,結(jié)果令人滿意。3.研究了在O.1mol/L磷酸介質(zhì)中,活化劑抗壞血酸(C6H806)的作用下,v(v)催化氯酸鉀(KCl03)氧化甲基紅(C15H15N302)褪色的指示反應(yīng),由此建立了一種靈敏度高、選擇性好的測(cè)定痕量釩的催化動(dòng)力學(xué)光度新方法。研究了影響該催化褪色反應(yīng)的因素。本方法的線性范圍為0.09~7.0ng/mL,檢出限為2.9x10‘1g
2、/mE。該法用于實(shí)際樣品的測(cè)定,結(jié)果令人滿意。關(guān)鍵詞:催化動(dòng)力學(xué)光度法,茜素紅,甲基紅,鉻(Ⅵ),釩(V)nCatalytickineticspectrophotometricdeterminationoftracechromiumandvanadiumMajor:AnalyticalChemistryName:ShenShuJunSupervisor:Prof.ZouXiaoyongAbstractTheanalysisofmetalsisveryimportantinthefieldsofsuchasmordernmedicine,pharmacy,life
3、science,foodscience,materialsscience,geology,chemicalindustryandenvironmentalmonitoring.Somemetalssuahasvanadium,iron,zinc,andcopper,aretracenutrientelementsthathumanbodyneed.Butthesemetalsaretoxicwhentheirconcentrationsexceedacertainvalues.Somemetalssuchaschromium,lead,mercury,andar
4、senic,aretoxictohumanbodyTheyCanaccumulateinvariousorganismswhichdogreatharmtothebodies.Manymethodshadbeendevolopedforthedeterminationofmetals,forexample,atomicabsorptionspectrometry(AAS),graphitefumaceatomicabsorptionSpectrometry(GFAAS),atomicemissionspectrometry(aES),voltammetryand
5、inductivelycoupledplasmamassspectrometry(ICP-MS)etc.Thoughtheabovemethodsmentionedareofhighsensitivityandaccuracy,theshortagesarealsoexistsobviously,eg.theapparatusareexpensive,theoperationaretimeconsuming.So,thedevelopmentofthesemethodswouldbelimitedonacertainextent.Thecatalytically
6、kineticspectrophotometryhasgoodsensitivity,excellentselectivity,simpleprocedure,andeasyoperation.Itisoneofthemostefficaciousmethodsinthemeasurementoftracemetalelement.Inthethesis,themeasurementsoftracechromium(VI)andvanadium(V)wereestablishedwithkineticspectrophotometry,andtheirreact
7、ionmechanismswerealsoIIIdiscussed.Therearethreechaptersinthisthesisandthemainresultsofeachchapteraresummarizedasfollows:1.Thedevelopmentsandfundamentalsinregardtokineticanalyticmethodandcatalytickineticspectrophotometricmethodaredifferentlydiscussed,andthecharacteristic,classificatio
8、n,appliedval