Journal of the Korean Chemical Society (대한화학회지)

Korean Chemical Society (대한화학회)
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Anodic Stripping Voltammetric Determination of Iodide Ion with a Cinchonine-Copper(Ⅱ) Complex Modified Carbon Paste Electrode

Cinchonine-Copper(Ⅱ) 착물로 변성된 탄소반죽전극을 이용한 요오드 이온의 양극벗김전압전류법 정량

  • Kwak, Myung Keun (Department of Chemistry, Pusan National University) ;
  • Park, Deog Soo (Department of Chemistry, Pusan National University) ;
  • Jeong, Euh Duck (Department of Chemistry, Pusan National University) ;
  • Won, Mi Sook (Pusan Buranch, Korea Basic Science Institute, in Pusan National University) ;
  • Shim, Yoon Bo (Department of Chemistry, Pusan National University)
  • 곽명근 (부산대학교 자연과학대학 화학과) ;
  • 박덕수 (부산대학교 자연과학대학 화학과) ;
  • 정의덕 (부산대학교 자연과학대학 화학과) ;
  • 원미숙 (기초과학지원연구소 부산분소) ;
  • 심윤보 (부산대학교 자연과학대학 화학과)
  • Published : 19960500
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Abstract

Electrochemical determination of iodide was carried out by stripping voltammetry with a $(Cin)Cu(NO_3)_2$ modified-carbon paste electrode. Iodide was coordinated onto the electrode surface containing $(Cin)Cu(NO_3)_2$ via ion exchange. The oxidation peak potential of incorporated iodide was ＋0.72 V. The optimum analytical conditions for the determination of iodide were investigated using linear sweep voltammetry. Optimum conditions for the electrochemical determination of iodide were as follows: i) A predeposition solution was 0.1 M $KNO_3.$ ii) The deposition time was 10 min. iii) The composition of the electrode was 40% (w/w). The detection limit for iodide was $1.0{\times}10^{-6}M$ and the relative standard deviation was ${\pm}5.5%\;in\;2.0{\times}10^{-5}M$(four repetitions). The interference effect of other anions were also investigated. $Cl^-,\;Br^-,\;C_2O_4^{2-},\;and\;ClO_4^-$ ions do not interfere for the determination of iodide. When $SCN^-$ was added to the deposition solution, the oxidation peak current of iodide ion was decreased roughly 32%.

$(Cin)Cu(NO_3)_2$으로 변성된 턴소반죽전극을 제작하여 $I^-$이온을 벗김전압전류법을 이용하여 정량하였다. $I^-$이온은 변성제인 $(Cin)Cu(NO_3)_2$착물에 배위된 $NO_3^-$와 이온교환에 의해 변전극에 감응하며, 산화전위는 +0.72 V였다, $I^-$ 이온의 최적분석 조건은 다음과 같다: 농축용액의 조성은 0.1 M $KNO_3$, 농축시간은 10분, 탄소분말에 대한 변성제의 함량은 40%(w/w). 선형주사 양극벗김전압전류법(Linear Sweep Anodic Stripping Voltammetry)에 의한 $I^-$이온의 검출한계는 $1.0{\times}10^{-6}M$이며, $2.0{\times}10^{-5}M$에서 구한 상대표준편차는 ${\pm}5.5%$였다. 여러 음이온에 대하여 방해작용을 검토한 결과 $Cl^-,\;Br^-,\;C_2O_4^{2-},\;ClO_4^-$ 등은 $I^-$이온의 정량에 영향을 주지 않았지만, $SCN^-$ 이온은 $I^-$ 이온의 산화전류를 약 32% 감소시켰다.

Keywords

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