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首页> 外文学位 >A. Ion-selective electrodes based on electropolymerized crown ethers. B. Detection of hydrogen peroxide at a cadmium-modified platinum electrode in flow injection analysis
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A. Ion-selective electrodes based on electropolymerized crown ethers. B. Detection of hydrogen peroxide at a cadmium-modified platinum electrode in flow injection analysis

机译：A.基于电聚合冠醚的离子选择电极。 B.流动注射分析法在镉修饰的铂电极上检测过氧化氢

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Section A. Ion selective electrodes based on the immobilization of crown ethers in liquid membranes and inert solid polymer films are common. So far, however no Sr$sp{+2}$ selective electrode with a high rejection of alkali-metal as well as the other alkaline-earth metal cations, based on electropolymerized crown ethers, has been described.;The work in this thesis describes the potential response behavior of a strontium doped poly(dibenzo-18-crown-6) film electrode, to strontium ion concentration in solution has been examined. The effect of polymerization conditions on the characteristics of the response is discussed. The performance of the electrode with respect to electrode reproducibility, response stability and regeneration is also studied. As stated the calibration plots for electrode have an unexpected slope of 31-32 mv per potassium concentration decade at 25$spcirc$C and 58-59 mv per strontium (II) concentration per decade. The selectivity coefficients for this polymeric electrode for most of the potential interferants are in the order of 10$sp{-3}$. This polymeric film electrode has a relatively fast response, and is easy to prepare and has a reasonable lifetime.;Section B. The analysis of hydrogen peroxide is of great importance in the studies of fuel cells, photocatalytic water splitting, bioelectrochemistry, etc. The polished platinum-electrode has been used to detect hydrogen peroxide at +0.93 V vs. SCE in a supporting electrolyte of 1 M sulfuric acid. But under these potential conditions, various interferences from cations and organic compounds have been observed. The modification of glassy carbon-electrode, by cycling in a solution of Na$sb2$IrCl$sb6$, PdCl$sb2$ and HCl, has previously been reported. This modified electrode was used in linear scan voltammetry to detect hydrogen peroxide.;The work in this thesis describes a cadmium-modified platinum electrode (Cd-CME) as an electrochemical sensor for hydrogen peroxide. The performance of this sensor is evaluated in FIA and its response towards hydrogen peroxide is studied. Comparison of this Cd-CME is done with a simple polished platinum electrode.
机译：A节基于在液体膜和惰性固体聚合物膜中固定冠状醚的离子选择电极是常见的。然而，迄今为止，还没有描述基于电聚合冠醚的具有高排斥碱金属和其他碱土金属阳离子的Sr $ sp {+2} $选择性电极。描述了锶掺杂的聚（dibenzo-18-crown-6）薄膜电极的电位响应行为，已经研究了溶液中锶离子的浓度。讨论了聚合条件对响应特性的影响。还研究了电极在电极重现性，响应稳定性和再生方面的性能。如前所述，电极的校准曲线在25°C时每钾浓度十年的意外斜率为31-32 mv，每十年中每锶（II）浓度的斜率为58-59 mv。对于大多数潜在干扰物，该聚合物电极的选择性系数约为10 $ sp {-3} $。该聚合物膜电极具有相对较快的响应，并且易于制备且寿命合理。； B部分。过氧化氢的分析在燃料电池，光催化水分解，生物电化学等研究中具有重要意义。抛光的铂电极已用于在1M硫酸的支持电解质中检测相对于SCE在+0.93 V下的过氧化氢。但是在这些潜在条件下，已经观察到来自阳离子和有机化合物的各种干扰。以前已经报道过通过在Nasb2 $ IrCl $ sb6 $，PdCl $ sb2 $和HCl溶液中循环来修饰玻璃碳电极的方法。该修饰电极用于线性扫描伏安法中检测过氧化氢。本论文的工作描述了一种镉修饰的铂电极（Cd-CME）作为过氧化氢的电化学传感器。在FIA中评估了该传感器的性能，并研究了其对过氧化氢的响应。使用简单的抛光铂电极可以比较此Cd-CME。

著录项

  • 作者

    Akmal, Naim.;

  • 作者单位

    University of Cincinnati.;

  • 授予单位 University of Cincinnati.;
  • 学科 Analytical chemistry.;Polymer chemistry.;Chemical engineering.
  • 学位 Ph.D.
  • 年度 1992
  • 页码 164 p.
  • 总页数 164
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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