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 [국제학회]Integrated Pulsed Electrochemical Detection of Thiourea at a Gold Electrode in a Flow Injection Analysis |
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Joon-Woo Lee and In-Hyeong Yeo
Department of Chemistry, Dongguk Univ.
발표형식: Keynote Lecture, 발표일자: 2001.08.08
학회명: Asianalysis VI(The Sixth Asian Conference on Analytical Sciences), 개최지: Tokyo, Japan
기타: .
ABSTRACT: August 8 Keynote Lecture
1B3-10 Integrated Pulsed Electrochemical Detection of Thiourea at a Gold Electrode in a Flow Injection Analysis
Joon-Woo Lee and In-Hyeong Yeo
Integrated pulsed electrochemical detection was applied for the determination of thiourea, a representative sulfur-containing organic compounds, in a flow injection system. The pulse waveform used in the integrated pulsed electrochemical detection scheme usually consisted of three steps: detection potential, oxidation potential, and reduction potential. Unlike pulsed amperometric detection, faradaic current was integrated over the duration time of the detection potential except initial 10 ms to exclude the non faradaic components. The faradaic signal turned out to be dependent on the waveform parameters. Optimization of the waveform parameters was necessary to achieve sensitive etection of thiourea. With the optimized waveform, integrated pulsed electrochemical detection provides a better signal to noise ratio and lower detection limit in comparison to the conventional pulsed amperometry. Quantitative analysis of thiourea with the integrated pulsed electrochemical detection scheme provides a detection limit of 6.01 x 10-7 M in 0.1 M NaOH. |
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HIT : 1121
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