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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 38, Number 10
JKCSEZ 38(10)
August 20, 1994 

Determination of Ag(Ⅰ) Ion with a Chemically Modified Carbon Paste Electrode Containing Cinchonidine

Cinchonidine으로 변성된 Carbon Paste 전극을 사용한 은이온의 정량
Sheen-Hee Kim, Mi-Sook Won, Yoon-Bo Shim

김신희, 원미숙, 심윤보
Ag(Ⅰ) 이온의 정량을 위해 cinchonidine으로 변성된 탄소 반죽전극(carbon paste electrode : CPE)을 제작하여 순환 전압-전류법 및 시차펄스 전압-전류법(differential pulse voltammetry:DPV)을 사용하여 정량하였다. Ag(Ⅰ)이온의 검출한계는 순환 전압-전류법으로는 1.0 × 10-6 M, 시차펄스 전압-전류법에서는 8.0 × 10-9 M (±0.6%)이었다. Ag(Ⅰ)이온의 최적 분석조건은 pH 7, 담그는 시간은 20분, 그리고 탄소 분말에 대한 cinchonidine의 함량은 50% (w/w)였다. 방해 작용이 예상되는 다른 여러 종류의 금속 이온에 대하여 실험한 결과 Hg(Ⅱ)이온을 제외한 다른 금속 이온 용액에서는 25% Ag(Ⅰ) 이온 전류 크기가 감소하였다. 또한 Mn(Ⅱ)이온이 존재할 때 pH 9에서 큰 방해 작용을 나타내었다.

Electrochemical determination of Ag(Ⅰ) ion was carried out by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) with the carbon paste electrode (CPE) containing cinchonidine. The detection limit for Ag(Ⅰ) ion was shown to be 1.0 × 10-6 M in conventional CV and up to 8.0 × 10-9 M (±0.6%) using DPV. The optimum analytical condition of Ag(Ⅰ) ion was determined as follows: pH 7, 20 minutes of deposition time, and 50% (w/w) cinchonidine to carbon powder composition of electrode. The interference effect of various metal ions added to the deposition solution was also studied. The peak current of Ag(Ⅰ) ion except Hg(Ⅱ) ion was decreased roughly 25% compare to Ag(Ⅰ) ion only. When Mn(Ⅱ) ion was present in sample solution at pH 9, shown a large interference effect.

734 - 740
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