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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 40, Number 5
JKCSEZ 40(5)
October 20, 1996 

 
Title
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 이온으 양극벗김전압전류법 정량
Author
Myung-Keun Kwak, Deog-Soo Park, Euh-Duck Jeong, Mi-Sook Won, Yoon-Bo Shim

곽명근,박덕수,정의덕,원미숙,심윤보
Keywords
Abstract
(Cin)Cu(NO3)2으로 변성된 탄소반죽전극을 제작하여 I- 이온을 벗김전압전류법을 이용하여 정량하였다. I- 이온은 변성제인 (Cin)Cu(NO3)2 착물에 배위된 NO3-와 이온 교환에 의해 변성전극에 감응하며, 산화전위는 +0.72V였다. I- 이온의 최적분석 조건은 다음과 같다: 농축용액의 조성은 0.1M KNO3, 농축 시간은 10분, 탄소분말에 대한 변성제의 함량은 40%(w/w). 선형주사 양극벗김전압전류법(Linear Sweep Anodic Stripping Voltammetry)에 의한 I- 이온의 검출한계는 1.0×10-6M이며, 2.0×10-5M에서 구한 상대표준편차는 ±5.5%였다. 여러 음이온에 대하여 방해작용을 검토한 결과 Cl-, Br-, C2O42-, ClO4-등은 I-이온의 정량에 영향을 주지 않았지만 SCN- 이온은 I- 이온의 산화전류를 약 32% 감소시켰다.

Electrochemical determination of iodide was carried out by stripping voltammetry with a (Cin)Cu(NO3)2 modified-carbon paste electrode. Iodide was coordinated onto the electrode surface containing (Cin)Cu(NO3)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 KNO3. ii) The deposition time was 10 min. iii) The composition of the electrode was 40% (w/w). The detection limit for iodide was 1.0×10-6 M and the relative standard deviation was ±5.5% in 2.0×10-5 M(four repetitions). The interference effect of other anions were also investigated. Cl-, Br-, C2O42-, and ClO4- 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%.

Page
341 - 346
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