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首页> 外文会议>American Chemical Society National Meeting >Spectroelectrochemical Sensor for Technetium: Preconcentration and Quantification of Pertechnetate in Polymer-Modified Electrodes
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Spectroelectrochemical Sensor for Technetium: Preconcentration and Quantification of Pertechnetate in Polymer-Modified Electrodes

机译：用于技术的光谱电化学传感器：聚合物改性电极中腹部嵌入的预浓缩和定量

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A remote spectroelectrochemical sensor and instrumentation package is being developed for the detection of technetium as aqueous pertechnetate (TcCV) in the vadose zone and associated groundwater. This sensor would be used to monitor the integrity of low-level and high-level nuclear waste containment at U.S. Department of Energy sites. Electrochemical studies of TcCV reduction at bare indium doped tin oxide (ITO) optically transparent electrodes (OTEs) show a poorly formed reduction wave for cyclic voltammetry and precipitation of technetium oxide (TcO2) on the electrode surface. Similar experiments at ITO OTEs coated with thin firms containing cationic polymers show partitioning of TcO4" into the films. Three films were investigated: poly(dimethyldiallylammonium chloride) (PDMDAAC) and quaternized poly(4-vinylpyridine) (QPVP), both immobilized in porous glass by the sol-gel process, and poly(vinylbenzyltrimethylammonium chloride) (PVTAC) copolymerized with poly(vinylalcohol). The largest enhancement in cyclic voltammetry reduction wave for TcO was for QPVP. The electrochemical mechanism changes to favor the formation of a relatively long-lived soluble species that ultimately converts to TcO2. The electrodeposition of technetium oxide in these films was shown to be a method for the quantitative spectroelectrochemical determination of TcCV and has been verified using radiochemistry dose measurements and scanning electron microscopy.
机译：正在开发远程光谱电化学传感器和仪表封装，用于检测在助囊区和相关地下水中作为植物水平植物水溶液（TCCV）。该传感器将用于监测美国能源地点的低水平和高级核废料遏制的完整性。裸铟掺杂氧化锡（ITO）光学透明电极（OTES）的电化学研究表明，用于循环伏安法和电极表面上氧化钇（TCO2）的沉淀变化的较差。类似的实验，涂有含有阳离子聚合物的薄件的ITO OTES，将TCO4“分配到薄膜中。研究了三种薄膜：聚（二甲基氯基铵）（PDMDAAC）和季铵化聚（4-乙烯基吡啶）（QPVP），无论是多孔的通过溶胶 - 凝胶工艺的玻璃，与聚（乙烯基醇）共聚的聚（乙烯基苄基三甲基氯化铵）（PVTAC）。TCO的循环伏安法减少波的最大增强是用于QPVP的。电化学机制变化，有利于形成相对较长的形成 - 最终转化为TCO2的方法。这些膜中氧化钇的电沉积被证明是用于定量光谱电化学测定TCCV的方法，并通过放射化学剂量测量和扫描电子显微镜进行验证。

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