【作者】 李素芬；

【导师】 刘钟阳；

【作者基本信息】 大连理工大学 ， 电工理论与新技术， 2005， 硕士

【摘要】 为提高臭氧水处理过程的监测水平,优化生产工艺,促进臭氧技术的推广应用,在对水中臭氧检测技术发展历史和国内外现状的分析基础上,对控制电位型水中臭氧电化学传感器的相关问题进行了研究和探讨。文中首先进行了试验方案选择,探讨了金铜两电极传感器、ORP传感器以及膜电极传感器和控制电位型水中臭氧电化学传感器的原理、优缺点以及使用范围。其中,金属电极控制电位型传感器是适合在线检测水中臭氧的新型电化学传感器。控制电位的高低直接决定了传感器分析被检测物质的种类以及对溶液中杂质离子的抗干扰性,所以准确且稳定的控制电位值对传感器是至关重要的。文中采用MCP-1型恒电位仪绘制了传感器的循环伏安曲线、极化曲线和不同电位时的电流响应对比曲线。通过对三条曲线的综合分析,得出控制电位为0. 50V时传感器的电流响应线性度好,灵敏度高。此外,设计了电位控制和测量电路,应用此电路实现了对传感器的电位控制以及输出信号的处理。通过与TIZ-OEM型水中臭氧分析仪的对比曲线,得出采用控制测量电路的传感器的响应快,线性好;对控制电位的选择准确且电压稳定,精度可以达到1mV,满足了传感器对控制电位的要求。综上,本文主要对用于检测水中臭氧的控制电位型电化学传感器进行试验研究,该型传感器通过合适的电位控制以及控制测量电路的配合应用,可以实现对臭氧的检测,并具有响应迅速、灵敏度高、维护方便、寿命长的优点,具有较好的应用前景。更多还原

【Abstract】 In order to increase the detecting level of water treatment using ozone and optimizing production process, based on analyzing state of arts on detecting technique for ozone in water, some problems on controlled potential electrochemical sensor for ozone in water are studied in the dissertation.Firstly, the selection of schemes is discussed in this paper. The principle and applied range of four sensors are introduced, which including two electrode (gold and copper), ORP sensor, modular sensor and controlled potential electrochemical sensor. Among them, the metal electrode controlled potential sensor is a new type electrochemistry sensor suiting for on-line detecting ozone in water.The characteristics of sensor are directly decided by controlled potential for sensor, including the kinds of substance and the anti-jamming to impurity in solution. So, it is very important for selecting an controlled potential exactly and steadily. Cyclic voltammetry curve, polarization curve and current responding curve versus different potential are obtained with MCP-1 type potentiostat.By integrated analysis of curves, when controlled potential is selected at 0.50V, the current responding of the sensor has a better linearity and higher sensitiveness.Moreover, the potential controlling circuit and signal measuring circuit are designed and applied in controlling potential and processing the output signal of the sensor. Compared with the curve of TIZ-OEM type ozone analyzer, the results demonstrated that sensor working with control and measuring circuit has a fast response and a good linearity because of precise choose of controlling potential and high precision for 1mV.In general, controlled potential electrochemical sensor for ozone is studied to realize detecting for ozone in water by adopting the appropriate controlled potential and control and measuring circuit. At the mean time, it has a fast response, high sensitivity, convenient maintenance and longevity. The sensor is very perspective.更多还原