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首页> 外文期刊>Fresenius' Journal of Analytical Chemistry >Voltammetry of biologically active species and surfactants on new miniaturized and contractible (compressible) mercury electrodes
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Voltammetry of biologically active species and surfactants on new miniaturized and contractible (compressible) mercury electrodes

机译：新型小型可收缩（可压缩）汞电极上生物活性物质和表面活性剂的伏安法

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摘要

The adsorption of the polyether-antibiotic monensin from an aqueous solution on mercury was used to investigate the effect of the decreasing size of a stationary mercury drop electrode on the shape of the voltammetric desorption peak of the surfactant. The change of the i-E curve indicated an acceleration of the transport of the surfactant to the electrode as well as of time-dependent changes in the adsorption layer. A decrease of the radius of the hanging mercury drop electrode from 220 #mu#m to 80 #mu#m at a constant accumulation time of t_(ac) = 70 s resulted in an about 4-fold increase of the evaluated signal (i-E pre-wave) of monensin. A 7-fold increase of the voltammetric desorption peak of monensin at conc. 5 centre dot 10~(-7) mol/L was observed as result of a compressive accumulation of the surfactant due to a contraction of the mercury drop electrode. A scheme of an apparatus for voltammetric/polarographic measurements by means of the contractible (compressible) mercury drop electrode is described. The controlled contraction of the electrode surface is presented together with preliminary results covering a new way of accumulation of surfactants, new accumulation effects, effective in adsorptive voltammetry, and other electroanalytical techniques.
机译：使用聚醚-抗生素莫能菌素从水溶液中吸附到汞上来研究固定式汞滴电极尺寸减小对表面活性剂伏安解吸峰形状的影响。 i-E曲线的变化表明表面活性剂向电极的传输加速，以及吸附层随时间的变化。在t_（ac）= 70 s的恒定累积时间内，悬挂式汞滴电极的半径从220＃mu＃m减小到80＃mu＃m，导致评估信号（iE莫能菌素前波）。莫能菌素在浓下的伏安解吸峰增加了7倍。观察到5个中心点10〜（-7）mol / L，这是由于汞滴电极收缩引起的表面活性剂的压缩积累。描述了借助于可收缩的（可压缩的）汞滴电极进行伏安/极谱测量的设备的方案。介绍了电极表面的可控收缩以及初步结果，这些结果涵盖了表面活性剂的新积累方式，新的积累效应，对吸附伏安法有效以及其他电分析技术。

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