Study On Electrochemical Pretreatment And Its Application In Food Analysis

In the dissertation ,3 kinds of electrochemical pretreatments and homologous equipment used in ion chromatography(IC) were studied . When determining Na+,NH4+,K+,Mg2+ and Ca2+ in cron, OH- was produced by electrolyzing water to neutrolize the acid in sample,so the sample was suitble for ion chromatography. When determining Iodine in laver ,I- was exchanged to IO3- by electrochemical oxidizer , then Iodine could be determined by suppressed conductance ion chromatography. When determining bromate in flour,BrO3- was exchanged to Br- by electrochemical reductor,then the interference with determination of BrO3- by ion chromatography from Cl- was eleminated. The electrochemical pretreatmentor were electrodialysis cell or electrolytic bath made of anion exchange membrane and electrodes that plated platinum on titanium.There are four chapters in the dissertation.In chapter 1, the pretreatments of ion chromatography,principle and related knowledges of electrochemical pre-processor were introduced. An electrochemical pretreater of IC was proposed .In chapter 2,an electrochemical neutralization and its application to determining Na+,NH4+,K+,Mg2+,Ca2+ in corn were studied. This chapter was divided into four sections:In section 1, the significance of determining Na+,NH4+,K+,Mg2+,Ca2+ in corn ,disadvantages of traditional determinations,introduced . Using electrochemical nutrilization as pretreatment of IC was proposedIn section 2 , the digestion and the electrochemical nutrilization were introduced.In section 3, the experimental result and experimental condition were discussed.In section 4 ,the brief summary was made. In chapter 3,an electrochemical oxidation and its application to determining iodine in laver were studied. This chapter was divided into four sections:In section 1 ,the significance of determining iodine in laver and shortages of the traditional determinations were described,and a new method that use electrochemical oxidation as the pretreatment of determine iodine in laver by IC was Propounded.In section 2 ,the course of the experimentation was introduced .In section 3 ,the result and conditions of the experiment were discussed.In section 4 ,the brief summary was made.In chapter 4 ,an electrochemical reduction and its application to determining bromate in flour were studied. This chapter was divided into four sections:In section 1 ,the origin of bromate problem in flour and shortages of traditional determinations were introduced.In section 2 ,the experimentation was introduced.In section 3, the result and condition of the experiment were discussed. This section still discussed the structure and working process of electrochemical deoxidizer , condition of separation and deoxidization .In section 4, the brief summary was made.