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首页> 外文学位 >Surface interactions of mercury on gold foil electrodes in electrodeposition and stripping, and, An investigation of free thiolate ions from metal-thiolate chalcogenides.
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Surface interactions of mercury on gold foil electrodes in electrodeposition and stripping, and, An investigation of free thiolate ions from metal-thiolate chalcogenides.

机译：汞在电沉积和剥离中与金箔电极上的表面相互作用，以及对金属硫醇盐硫属元素化物中游离硫醇盐离子的研究。

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摘要

Mercury, a highly toxic metal, whose environmental concentration magnifies with ascension of the food chain, is monitored in our waters, food and air. Monitoring mercury is generally done by sample collection, transport to the laboratory; followed by: digestion of the sample, separation of the mercury and detection of the mercury: mostly by cold vapor atomic absorption or, cold vapor atomic fluorescence. These monitoring methods, preclude, routine, in-the-field mercury determination.; New analytical techniques have been proposed for in the field determination of mercury. They consist of mercury adsorption onto a sensor or electrode and measuring how much is there either as the adsorbate or, as the analate being removed from the detection device. Many employ gold as an accumulation substrate because of its affinity for mercury. One group of proposed techniques, requires that mercury be reduced electrochemically onto a gold electrode and then removed by anodic current oxidation. The determination of mercury is made from measurements of: the current, or the frequency shift of a surface acoustic wave due to the mass of the accumulated mercury.; Our research focused on the electrodepositon and stripping of mercury on gold foil electrodes. We demonstrated by x-ray photoelectron spectroscopy that electrodeposited mercury cannot be completely removed by electrochemical stripping and that with many repetitive deposition and stripping cycles, there is a progressive accumulation of mercury on the gold electrodes which continues to manifest even in mercury free electrolyte solution. The latter was demonstrated by linear sweep voltammetry and temperature programmed desorption of the accumulated mercury.; Mercury's toxicity is based on its formation of relatively non-polar complexes and its high affinity for thiol and sulfide functional groups (i.e. the amino acid cysteine). Our electrochemical and conductivity studies of nine metal-thiolate chalcogenides indicated that some form free thiolate ions at high concentrations rather than low ones.
机译：汞是一种剧毒金属，其环境浓度随着食物链的增加而放大，我们的水，食物和空气中都受到了监测。汞的监测通常通过样品收集，运输到实验室来完成；其次是：样品的消化，汞的分离和汞的检测：主要是通过冷蒸气原子吸收或冷蒸气原子荧光。这些监测方法无法进行常规的现场汞测定。已经提出了用于现场测定汞的新分析技术。它们包括将汞吸附到传感器或电极上，并测量其中有多少是被吸附物，或者是从检测设备中除去的分析物有多少。由于金对汞的亲和力，许多人将金用作积累底物。提出的一组技术要求将汞通过电化学方法还原到金电极上，然后通过阳极电流氧化将其除去。汞的测定是通过以下方法进行的：由于积聚的汞的质量，表面声波的电流或频率偏移。我们的研究重点在于金箔电极上的电沉积和汞的汽提。我们通过X射线光电子能谱证明，电沉积的汞不能通过电化学剥离方法完全去除，并且通过许多重复的沉积和剥离循环，汞在金电极上逐渐积累，甚至在无汞电解质溶液中也不断出现。后者通过线性扫描伏安法和程序升温程序对积累的汞进行解吸证明。汞的毒性基于其相对非极性复合物的形成以及对硫醇和硫化物官能团（即氨基酸半胱氨酸）的高亲和力。我们对9种金属硫醇盐硫属元素化物的电化学和电导率研究表明，某些金属硫醇盐离子以高浓度而不是低浓度形成游离硫醇盐离子。

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  • 作者

    Watson, Charles Martin.;

  • 作者单位

    The University of Maine.;

  • 授予单位 The University of Maine.;
  • 学科 Chemistry Analytical.; Chemistry Inorganic.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 232 p.
  • 总页数 232
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;无机化学;
  • 关键词

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