Quinine-Cd 착물을 Ionophore로 이용한 Iodide 이온 선택성 고체 접촉 전극
Iodide Ion Selective Solid Contact Electrode based on Quinine-Cd Ionophore
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초록
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.
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.
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