메틸트리옥틸-암모늄 이온 Ionophore를 이용한 요오드 이온 선택성 고체 접촉 전극
Development of Ion Selective Solid Contact Electrode Based on Methyl-tri-octyl-ammonium Ion Ionophore for Iodide Detection
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In this study, an iodide ion selective poly(aniline) solid contact electrode based on methyltrioctyl-ammonium ion ionophore as a sensing material was developed. This electrode was made of Me-TOA 2.0, PVC 30.0, and NPOE 68.0. The electrode exhibits a good linear response of 58.8 mV/decade (at 20 ± 0.2oC, r 2= 0.9998)within the range of 1×10-1 M~1×10-5.2 M KI solution. When the electrode was used with different alkyl chain ionophores and plasticizers, this electrode had the best result in response characteristics. The electrode showed a good selectivity for iodide ion than any other anions and is suitable detect it in aqueous solutions of pH 3.0~12.0. Their standard deviation in the measured emf differences was ± 1.2 mV at iodide sample solution of 1.0×10-2 M and ± 0.9 mV at 1.0×10-4 M. Their stabilization time was less than 125 sec, and response time was less than 22 sec.
Abstract
In this study, an iodide ion selective poly(aniline) solid contact electrode based on methyltrioctyl-ammonium ion ionophore as a sensing material was developed. This electrode was made of Me-TOA 2.0, PVC 30.0, and NPOE 68.0. The electrode exhibits a good linear response of 58.8 mV/decade (at 20 ± 0.2oC, r 2= 0.9998)within the range of 1×10-1 M~1×10-5.2 M KI solution. When the electrode was used with different alkyl chain ionophores and plasticizers, this electrode had the best result in response characteristics. The electrode showed a good selectivity for iodide ion than any other anions and is suitable detect it in aqueous solutions of pH 3.0~12.0. Their standard deviation in the measured emf differences was ± 1.2 mV at iodide sample solution of 1.0×10-2 M and ± 0.9 mV at 1.0×10-4 M. Their stabilization time was less than 125 sec, and response time was less than 22 sec.
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