Iodide Ion Selective Solid Contact Electrode based on Quinine-Cd Ionophore

,; ,; ,; ,; ,; ,

Research article

Journal of the Korean Society for Environmental Analysis 2011;14(4):185-191.

Quinine-Cd 착물을 Ionophore로 이용한 Iodide 이온 선택성 고체 접촉 전극

한원식¹, 이영훈², 이명희², 김현승², 백남권², 홍태기²

¹null
²한서대학교

Abstract

Iodide ion selective poly(aniline) solid contact electrode based on quinine-Cd ionophore as a sensing material has been successfully developed. The electrode exhibits good linear response of 51.6 mV/decade (at 20±0.2℃, r²=0.9996) within the concentration range of 1×10^(-5.11) - 1×10^(-1.00) M KI. The composition of this electrode was quinine-Cd 3.0 : PVC 30.0 : bis(2-ethylhexyl)sebacate 67.0 (mass). This plasticizer provides the best response characteristics. The electrode shows good selectivity for iodide ion in comparison with any other anions and is suitable for use with aqueous solutions of pH 3.5 - 8.7. The standard deviations of the measured EMF difference were ± 1.52 and ± 1.73 mV for iodide sample solutions of 1.0×10^(-2) M and 1.0×10^(-4) M, respectively. The stabilization time was less than 400 s. and response time was less than 43 s.

Key Words: ISE, SCE, Iodide, Quinine, ionophore, Cd complex