Citation: Shui Feng ZHANG, Li Shi WANG, Zhi DANG. A Compact System of Capacitively Coupled Contactless Conductivity Detection Based on the Square Wave Excitation Signal for Capillary Electrophoresis[J]. Chinese Chemical Letters, ;2006, 17(9): 1229-1232. shu

A Compact System of Capacitively Coupled Contactless Conductivity Detection Based on the Square Wave Excitation Signal for Capillary Electrophoresis

College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510640

Received Date: 27 March 2006

Fund Project: Financial support from the National Natural Science Foundation of China (No. 20475018) and the Key Program of Guangdong Natural Science Foundation (No. 05103552), are gratefully acknowledged.

This paper reported a compact system of capacitively coupled contactless conductivity detection (C⁴D) based on the square wave excitation voltage for capillary electrophoresis, and it exhibited excellent sensitivity at the optimal frequency of 198 kHz. The feasibility and sensitivity of this detector was demonstrated by simultaneous detection of thirteen ions including alkali, alkaline earth and heavy metal ions. And the detection limits (S/N 3) were in the range of 0.2-1μmol/L for Mn²⁺, K⁺, Na⁺, Mg²⁺, Ca²⁺, Li⁺, Ba2⁺, and 7-25μmol/L for Ni²⁺, Cu²⁺, Cd²⁺, Pb²⁺, Co²⁺, Zn²⁺.
- Capillary electrophoresis,
- square wave excitation signal,
- contactless conductivity detector,
- metal ions
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