A contactless conductivity detector for capillary electrophoresis: Effects of the detection cell geometry on the detector performance
A contactless conductivity detector for capillary electrophoresis: Effects of the detection cell geometry on the detector performance
复制标题
DOI：
10.1002/1522-2683(200211)23:21
复制
发表时间：
2002-11
期刊：
影响因子：
2.9
通讯作者：
P. Tůma;F. Opekar;K. Stulík
中科院分区：
文献类型：
--
作者：
P. Tůma;F. Opekar;K. Stulík
研究了电极间差距和电极宽度对电容布线非接触电导检测器性能的影响。所获得的结果已经表明，检测器的响应可以定性地描述的模型的基础上的有效电极宽度的概念，这是一个复杂的参数，由电极之间的差距，输入信号的频率和测试溶液的电导率确定。检测器的灵敏度和对分离效率的影响取决于有效电极宽度和几何电极宽度之间的差异。对于在较低频率下操作的具有宽电极的检测器已经获得了较高的检测灵敏度，然而，使用具有窄电极和较高操作频率的检测器已经获得了更好的分离效率。噪声随着电极之间的间隙的减小和频率的增加而增加，特别是对于采用窄电极的检测器。
The effect of the gap between the electrodes and of their width on the behavior of a capacitively wired contactless conductivity detector was studied. The results obtained have indicated that the detector response can be qualitatively described by a model based on the concept of the effective electrode width which is a complex parameter determined by the gap between the electrodes, the frequency of the input signal and the conductivity of the test solution. The detector sensitivity and the effect on the separation efficiency depend on the difference between the effective and geometric electrode widths. Higher detection sensitivities have been attained for detectors with wide electrodes operating at lower frequencies, however, better separation efficiencies have been achieved using detectors with narrow electrodes and higher operational frequencies. The noise increases with decreasing gap between the electrodes and increasing frequency, especially with detectors employing narrow electrodes.