The Research Of Interaction Between Prussian Blue Modified Electrodes And Nitrogen Compounds

Some nitrogen compounds have caused serious pollution to health in the wold and have attracted many people's attention. The extensive studies of nitrogen compounds in the environment or in the body play an important role in biological and physiological studies. Today with the rapid development of the modern industry, food processing industry and transportation, nitrogen pollution are more and more serious to the environment. It is significant to develop a fast detection method with high sensitivity and selectivity. The commonly recommended methods for nitrogen compounds in the environment and food are high performance liquid chromatography, atomic absorption spectrometry, atomic emission method, etc. All of these methods are instruments with complex operation, expensive, the time consuming. In this thesis, electrochemistry was used to study the interaction between the modified electrodes and nitrogen compounds and the separation and detection of nitrogen compounds in aqueous solution. Because of the modified electrodes with high catalytic activity for oxidation and reduction of some molecules show some special chemical, electronic, electrochemical and optical properties and increased electrode adsorption enrichment function. In this thesis, some experimental results were achieved as the following s.The prussian blue modified platinum disk electrode was prepared chemically, and the electrochemical behavior was studied by cyclic voltammetry(CV). The modified electrode shows a dropping behavior of hydrogen ion and hydroxylamine hydrochloride in prussian blue membrane with a diffusion controlled reversible electrochemical behavior in cathode and anode process. This dropping behavior can be used in the extraction of hydrochloric acid hydroxyl ammonia.The copper-prussian blue modified disk electrode shows a very good catalytic oxidation behavior to nitrite with a reversible redox behavior. Under the optimal experiment conditions, the electrode can be used in the detection of nitrite sodium from aqueous solution in the concentration range of 3.3 x 10-11mol-L-1～3.3 x 10-4mol·L-1 with detection limit of 3.3 x 10-11mol-L-1. The method has been used in the detection of nitrite in waste water.Based on the copper-prussian blue modified platinum disk electrode, the extraction behavior of dicyclohexylamine nitrite was studied by open potential method. The potential-time curves in the range of 0～6000 seconds were recorded as the dynamic adsorption with can sandhust effect. The detection of dicyclohexylamine nitrite simulated sample solution was studied, and larger interference was found in the detection of dicyclohexylamine nitrite such as ammonium, nitrate, and not be used for complex samples quantitative analysis.