【摘 要】
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We report a resonant method to measure the wall capacitance (Cw) and solution resistance (Rs) in a capacitively coupled contactless conductivity detector (C4D).
【机 构】
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The Key Lab in Molecular and Nano-Materials Probes of the Ministry of Education of China
论文部分内容阅读
We report a resonant method to measure the wall capacitance (Cw) and solution resistance (Rs) in a capacitively coupled contactless conductivity detector (C4D).Under the typical operating conditions in capillary electrophoresis (I.D.50 μm,O.D.360 μm,electrode length of 4 mm,electrode gap of 1 mm,frequency of 200 kHz),the values of Cw measured in 1 and 20 mmol/L NaC1 solutions are 2.8 and 32 fF,which are only 1.1％ and 12％ of prediction by the equation in references,respectively.The value of Rs is less than the prediction in solutions with k ＜ 0.02 S/m.The response current of C4D is due to the change in Cw because the total impedance of a C4D is composed mainly by the impedance from Cw.
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