A compact system of capacitively coupled contactless conductivity detection based on the square wave excitation signal for capillary electrophoresis

作者：Zhang Shui Feng; Wang Li Shi^*; Dang Zhi

来源：Chinese Chemical Letters, 2006, 17(9): 1229-1232.

• capillary electrophoresis
• square wave excitation signal
• contactless conductivity detector
• metal ions

This paper reported a compact system of capacitively coupled contactless conductivity detection ((CD)-D-4) 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 0.2-1 mu mol/L for Mn2 , K , Na , Mg2 , Ca2 , Li , Ba2 , and 7-25 mu mol/L for Ni2 , Cu2 , Cd2 , Pb2 , Co2 , Zn2 .

• 出版日期2006-9
• 单位华南理工大学