Microwave Activation of Electrochemical Processes: Square-Wave Voltammetric Stripping Detection of Cadmiumin the Presence of the Surfactant Triton X
Microwave Activation of Electrochemical Processes: Square-Wave Voltammetric Stripping Detection of Cadmiumin the Presence of the Surfactant Triton X
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电化学过程的微波激活：镉的方波伏安溶出检测表面活性剂 Triton X 的存在
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
F. Marken
中科院分区：
文献类型：
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作者：
Y. Tsai;B. A. Coles;R. Compton;F. Marken
一种基于微波腔内流动系统的新型电化学电池可以在微波条件下进行伏安实验。微波辐射在电极-溶液（电解质）界面的聚焦产生了极端局部加热的条件，在电极的扩散层和对流流动中产生了反向的热梯度。在0.1 M的醋酸缓冲溶液中，微波活化对Cd2+的沉积和阳极溶出检测有很强的增强作用。在0.1 M醋酸缓冲液中用可逆氧化还原对Ru(NH3)63+/2+校准电极-溶液界面温度。研究了微波活化对0.1 M醋酸缓冲溶液中Ru(NH3)63+还原和Cd2+检测方波伏安反应的影响。在非离子表面活性剂Triton X-100存在的情况下，微波活化在提高Cd2+检测灵敏度方面具有相当大的作用，而在常规条件下，Triton X-100会阻断Cd2+的电化学响应。
A novel electrochemical cell based on a flow through system in a microwave cavity is shown to allow voltammetric experiments under microwave conditions. Focusing of the microwave radiation at the electrode-solution (electrolyte) interface creates conditions of extreme localized heating with an inverted thermal gradient within the diffusion layer of the electrode and convective flow. The deposition and anodic stripping detection by square-wave voltammetry of Cd2+ in a 0.1 M acetate buffer solution is shown to be strongly enhanced by microwave activation. The temperature at the electrode-solution interface is calibrated with the reversible redox couple Ru(NH3)63+/2+ in 0.1 M acetate buffer. The effect of microwave activation on the square-wave voltammetric responses for the reduction of Ru(NH3)63+ and for the detection of Cd2+ in 0.1 M acetate buffer solution are studied. In the presence of a nonionic surfactant, Triton X-100, which blocks the electrochemical Cd2+ response under conventional conditions, microwave activation is shown to have a considerable effect in enhancing the sensitivity for Cd2+ detection.