| 方波激发非接触式电导检测器信噪比的影响因素研究 |
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| 引用本文： | 张水锋,王立世,党志,黄新建,刘笑笑,肖明威.方波激发非接触式电导检测器信噪比的影响因素研究[J].分析试验室,2008,27(2):10-14. |
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| 作者姓名： | 张水锋 王立世 党志 黄新建 刘笑笑 肖明威 |
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| 作者单位： | 华南理工大学化学科学学院,广州,510640 |
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| 基金项目： | 国家自然基金(20475018)，广东省自然科学基金(07006544)项目资助 |
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| 摘 要： | 研制了用于毛细管电泳的方波激发非接触式电导检测器(CCD)并详细考查了对检测器信噪比影响较大的几个重要因素,包括激发频率和运算放大器、基线分压电路和A/D转换器、数字低通滤波;以及常见缓冲体系2-(N-吗啡啉)-乙磺酸/组氨酸(MES/His)体系中电解质浓度,添加剂十六烷基三甲基溴化铵(CTAB)对金属离子的检出信号的影响。所得的结果对于该类检测器的设计和优化具有参考价值。
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| 关 键 词： | 非接触式电导检测器 方波 毛细管电泳 信噪比 金属离子 |
| 文章编号： | 1000-0720（2008）02-010-05 |
| 收稿时间： | 2006-12-20 |
| 修稿时间： | 2007-02-26 |
Factors effecting on signal-to-noise ratio of square wave excitation contactless conductivity detection |
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| ZHANG Shui-feng,WANG Li-shi,DANG Zhi,HUANG Xin-jian,LIU Xiao-xiao,XIAO Ming-wei.Factors effecting on signal-to-noise ratio of square wave excitation contactless conductivity detection[J].Chinese Journal of Analysis Laboratory,2008,27(2):10-14. |
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| Authors: | ZHANG Shui-feng WANG Li-shi DANG Zhi HUANG Xin-jian LIU Xiao-xiao XIAO Ming-wei |
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| Abstract: | A novel square wave excitation contactless conductivity detection was presented, and some significant factors effecting on the signal-to-noise(S/N) ratio of the detector were examined in detail.The assessments of S/N ratios were carried out,including the optimization of the excitation frequency of the square wave and the performance of the operational amplifier,both the parameters of the background baseline voltage-limited resistance and the A/D converter,the digital low-pass filtering parameters,as well as the concentration of the common running buffer,2-(N-morpholino) ethanesulfonic acid/L-Hisdine(MES/His) and the electroosmosis flow modified reagent,e.g.cetyltrimethylammonium bromide(CTMAB).The obtained results are significant references for optimization of the contactless conductivity detector. |
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| Keywords: | Cootactless conductivity detector Square wave Capillary electrophoresis Signal-to-noise ratio Metal ions |
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