Development of composited silver-carbon printing material for electroanalytical application

• Main Authors: Yu-Han Chang, 張羽涵
• Other Authors: 曾志明
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/6cbjk6

碩士 === 國立中興大學 === 化學系所 === 107 === The purpose of this study is to use silver powder combining carbon ink to develop a simple and rapid potentiometric sensor for detecting chloride ions in water samples by using electrochemical analysis technology and screen printing process. In the work, using screen printed silver-carbon composite material modified electrode (SPAg-CE) and the screen-printed silver electrode (SPAgE) to compare the chloride ion detection. When the concentration of chloride ions in the analysis solution is different, the electrochemical reaction potential of the chloride ions will change accordingly, and the linear relationship between the electrode potential and the chloride ion is used to measure the concentration of chloride in the solution. The linear range will vary when changing the ratio of different silver inks. The linear range of oxidation potential of chloride by the above two kinds of silver electrodes are as follows : 1%、3%、5% SPAg-CE shows a wide linear range from 3 – 800 mM. 10%、15%、20% SPAg-CE is 3 – 100 mM；The linear range of reduction potential : 1%、3%、5% SPAg-CE is 3 – 100 mM. 15%、20% SPAg-CE and SPAgE is 3 – 60 mM. When adding bromide and iodide ion for interference test, it was found that 5% SPAg-CE has the least interference in the detection. When detected by cyclic voltammetry, the reduction potential interference of chloride ions is only about 2%, that indicating it is not disturbed when the ratio of chloride to iodide concentration is 10 : 1, but the oxidation signal will be affected. At this time, if the reduction current of chloride ions is compared, it will found that the current interference is as high as 40%, so it is impossible to experiment with currents ; The ratio of chloride to bromide ion is adjusted to 20 : 1, there is a significant oxidation potential, and the reduction potential will be affected. Therefore, the analytical method was changed to differential pulse voltammetry, and the oxidation potential was used as the quantitative method. The experimental result shows that chloride ion and iodide ion are in the concentration range of 5 : 1 to 10 : 1, there is no interference. However, bromide ion has significant interference in the chloride / iodide concentation ratio range of 20 : 1 to 600 : 1. Finally, it is applied to measure the chloride ions in real samples.