In-situ measurement of the dissolved S^(2-) in seafloor diffuse flow system: sensor preparation and calibration
In-situ measurement of the dissolved S^(2-) in seafloor diffuse flow system:sensor preparation and calibration作者机构：Department of Earth Sciences Zhejiang University Hangzhou 310027 China The State Key Laboratory of Fluid Power Transmission ＆ Control Zhejiang University Hangzhou 310027 China
出 版 物：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 (浙江大学学报（英文版）A辑（应用物理与工程）)
年 卷 期：2008年第9卷第3期
页 面：423-428页
核心收录：
学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070302[理学-分析化学] 0816[工学-测绘科学与技术] 0703[理学-化学]
基 金：the National Natural Science Foundation of China (No. 40637037) the Hi-Tech Research and Development Program (863) of China (No. 2006AA09Z216)
主 题：Solid Ag/Ag2S electrode Preparation approach Performance
摘 要：The preparation approach and calibration result of an improved type of ion selective electrode （ISE）, which is used to measure the total dissolved S^2-, are introduced in this paper. The improved Ag/Ag2S electrode uses silver wire as the substrate, which is surrounded by electric polymer containing superfine silver powder. After the stabilization of the epoxy-resin, Ag2S layer was formed by chemical reaction with 0.2 mol/L （NH4）2S solution for 5 min. With Ag/AgC1 as reference electrode, the Ag/Ag2S electrode can be used to measure dissolved S^2-. The correlation between the measured potentials and the logarithm of dissolved S^2- is found to be linear, within range of the concentration of dissolved S^2- from 10^-2-10-7 mol/L. The slope of the regression line between measured potential and logarithm of dissolved S^2- is about -27.7, which agrees well with the theoretical Nernst value -29.6. Furthermore, the performance of the improved Ag/Ag2S electrode, such as the response time, sensitivity and stability, greatly outweighs the conventional Ag/Ag2S electrode.
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