| In-situ measurement of the dissolved S^2- in seafloor diffuse flow system： sensor preparation and calibration |
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| 作者姓名： | Ying YE Xia HUANG Yi-wen PAN Zhen-hua HAN Wei ZHAO |
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| 作者单位： | [1]Department of Earth Sciences, Zhejiang University, Hangzhou 310027, China [2]The State Key Laboratory of Fluid Power Transmission ＆ Control, Zhejiang University, Hangzhou 310027, China |
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| 基金项目： | 国家自然科学基金，国家高技术研究发展计划(863计划) |
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| 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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| 关 键 词： | 海底 流体系统 测量法 电极 |
| 收稿时间： | 2007-07-04 |
| 修稿时间： | 2008-01-18 |
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