Electrode Characteristics of K+ Ion-Selective PVC Membrane Electrodes with AC Impedance Spectrum

AC 임피던스 분석법을 이용한 K+ 이온선택성 PVC막 전극 특성

  • Kim, Yong-Ryul (Department of Chemical Engineering, Daejin University) ;
  • An, Hyung-Hwan (Department of Safety Engineering, Chungju National University) ;
  • Kang, An-Soo (Department of Chemical Engineering, Myong Ji University)
  • 김용렬 (대진대학교 화학공학과) ;
  • 안형환 (충주산업대학 산업안전공학과) ;
  • 강안수 (명지대학교 화학공학과)
  • Received : 1998.05.08
  • Accepted : 1998.07.02
  • Published : 1998.11.10

Abstract

With impedance spectrum measurements, impedance was studied in the interface between sample solutions for $K^+-ion$ selective PVC membrane electrode containing neutral carriers [dibenzo-18-crown-6 (D18Cr6) and valinomycine (Val)]. Response characteristics of electrode were examined by measuring AC impedance spectra that were resulted from the chemical structure and the content of carrier, variation of plasticizer, membrane thickness, doping of base electrolytes, and concentration variation of sample solution. Transport characteristics of PVC membrane electrode were also studied. It was found that the equivalent circuit for the membrane in $K^+$ solution could be expressed by a series combination of solution resistance and a parallel circuit consisting of the bulk resistance and geometric capacitance of the membrane system. But the charge transfer resistance and Warburg resistance were overlapped a little in the low concentration and low frequency ranges. The carrier, D18Cr6 was best for electrode and impedance characteristics, and ideal electrode characteristics were appeared especially in case of doping of the base electrolyte[potassium tetraphenylborate(TPB)]. The optimum carrier content was about 3.23 wt% in case of D18Cr6 and Val. DBP was best as a plasticizer. As membrane thickness decreased the impedance characteristics was improved, but electrode characteristics were lowered for membrane thickness below the optimum. In the case of D18Cr6, the selectivity coefficients by the mixed solution method for the $K^+$ ion were the order of $NH_4{^+}>Ca^{2+}>Mg^{2+}>Na^+$.

Acknowledgement

Supported by : 대진대학교

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