Amperometric Sensor for Water and Hg(II) ion with Chemically Modified Electrodes

다국어 초록 (Multilingual Abstract)

An electrochemical water-sensor has been constructed based on a split gold electrode(20μm) that is contact with the chemical synsthesised poly(1,5-DAN) film. Methods of quantitative analysis in system of water-nonaqueous solutions were investigated using a water sensor in the solutions changed depending on the water concentration. Various parameters, such as temperature, applied pulse potential, scan rate and detection sensitivity, were characterized. On a step change in the water concentration, a value of 90% of stationary response is attained within ca. 5sec for the chronampermetric measurement. Measuring currents linearly increased with increasing water concentration range from 0.05 to 20%. The sensitivity of measuring current was 90 nA/%. It is compared to Karl Fischer titroprocessor in sensitivity. It was found that the water concentration can be determined quantitatively by double step chronoameprmetry.

다국어 초록 (Multilingual Abstract)

A glassy carbon electrode(GCE) modified with 2.2':5',2''-Terthiophene by a spin coating has been used for the sensitive and selective analysis of trace amoung of Hg(Ⅱ)ion. Mercury was chemically deposited on modified glassy carbon electrode by simple immersion in a Hg(Ⅱ)solution, and the resulting surface were characterized by an anodic stripping linear sweep and differential pulse voltammetry. Various parameters such as r.p.m, pH, deposition time, spin coating concentration, deposition temperature that affect the sensitivity were optimized. We also have examined possible interference for the analysis Hg(Ⅱ) ion by other metal and no dircet response was observed for Bi(Ⅱ),Pb(Ⅱ),Cu(Ⅱ),Fe(Ⅱ),Cd(Ⅱ),Ti(Ⅱ),Ni(Ⅱ),Co(Ⅱ),Mg(Ⅱ),Al(Ⅲ),Sb(Ⅲ),Mn(Ⅲ),and Zn(Ⅲ) except Ag(Ⅰ). For a 15 min deposition time, a linear calibration curve is obtained for Hg(Ⅱ) cncentrations range from 1×10^(-7)M to 1×10^(-9)M, and the detection limit of Hg(Ⅱ)ion was 8×10^(-10)M by anodic stripping differential pulse voltammetry.

목차 (Table of Contents)

• 목차
• 그림목차 = 1
• 표목차 = 3
• Part Ⅰ. Quantititative analysis of water in nonaqueous solution by amperometric measurements of poly(1,5-diaminonaphthalene)film
• 1. 서론 = 4
• 2. 실험 = 7
• 3. 결과 및 고찰 = 10
• 4. 결론 = 25
• 5. 인용문헌 = 26
• 6. Abstract = 29
• Part Ⅱ. Determination of Hg(Ⅱ) ion with Terthiophene modified glassy carbon electrode
• 1. 서론 = 30
• 2. 실험 = 33
• 3. 결과 및 고찰 = 36
• 4. 결론 = 50
• 5. 인용문헌 = 51
• 6. Abstract = 53