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Fabrication and Application of Green Electrodes in Environmental and Food Analyses

Author: XieXueYing
Tutor: LiNianBing
School: Southwestern University
Course: Physical and chemical
Keywords: Chemically modified electrode Differential pulse voltammetry Bismuth film electrode Tin film electrode Organic compounds
CLC: O646.5
Type: Master's thesis
Year: 2010
Downloads: 77
Quote: 0
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Abstract


Mercury film electrode in electroanalytical chemistry research plays a significant role, but because of the toxic mercury (metallic mercury and mercury ions), people have been looking for a new green instead of mercury film electrode electrode. To from 2000, Wang and other bismuth film electrode applied the electrochemical research areas, the use of such electrodes, and research has aroused widespread concern of many of Electroanalytical Chemistry workers. Bismuth film electrode can be used for not only the determination of trace metal ions, but also can be used for the detection of certain organic molecules. The tin is also a \In recent years, our laboratory to carry out the development of the green tin film electrode and its application, made some meaningful research results, in order to further expand the scope of application of the bismuth film and tin film electrode, electrode content rich environment friendly, This article is mainly carried out research work as follows: 1. polyethylene Determination of azo compounds bare glassy carbon electrode surface by electrochemical polymerization method to build a stable poly film sulfanilic acid sulfanilic acid / bismuth film electrode. Pre-plated bismuth film bismuth electrodeposition poly to bare amino acid modified glassy carbon electrode to form a poly sulfanilic acid / bismuth film electrode. Scanning electron microscopy (SEM) Characterization found that bismuth in the surface of the polymeric film forming polyethylene sulfanilic bismuth nanoparticles. Differential pulse voltammetry, the electrode to complete the azo compound 1 - (2 - pyridylazo) -2 --naphthyl phenol (PAN), 4 - (2 - pyridylazo) - resorcinol (PAR) , azobenzene Determination. Experimental results show that the poly sulfanilic film, so that the more sensitive electrochemical response of the azo compound in the modified electrode. Under optimal experimental conditions, the PAN, PAR, the detection limit of the azobenzene were of 4.1 × -8 , of 3.3 × -8 and 3.8 × 10 -8 mol L -1 . Interference substances that affect the determination of the azo compounds. The electrode was used for the Determination of azo compounds in real samples with satisfactory results. 2 polyaniline / bismuth film electrode determination of Sudan Ⅰ bare glassy carbon electrode surface modified conductive polymer - polyaniline to form polyaniline modified electrode. Using pre-plated bismuth film electrodeposited bismuth to the polymeric membrane, new polyaniline / bismuth film electrode. Sudan 1 in the electrochemical response of the electrode using differential pulse voltammetry. Compared with bismuth film electrode Sudan Ⅰ in this new electrode to generate a strong response signal. In the optimal experimental conditions, the Sudan Ⅰ reduction peak current and the concentration of 1.0 × 10 -7 to 2.0 × 10 -4 mo1 L -1 linear range, the detection limit of 3.3 × 10 -8 mol L -1 . Experimental results show that: the electrode can be used for the determination of actual samples Sudan Ⅰ content. Study of membrane electrode the bismuth film / tin for 4 - nitrophenol was measured using electrodeposition method of co-deposition of bismuth, tin ion to the bare glassy carbon electrode surface tin film / bismuth film electrode. 4 - nitrophenol measured by cyclic voltammetry and differential pulse voltammetry. The use ratio of bismuth and tin ions on the determination. The experimental results show that, compared to the membrane electrode and bismuth and tin film electrode, the modified electrode shows a strong advantage in sensitivity, and the 4 - nitrophenol detection range of 5.0 × 10 -8 ~ 3.0 × 10 -4 mol L -1 , a correlation coefficient of 0.9993, the detection limit of 4.7 × 10 -8 mol L -1 < / sup>.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Electrochemical,electrolytic,magnetic,chemical > Electrolysis and Electrode role
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