• 분석과학
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• 제5권4호
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• pp.417-423
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• 1992

음극 벗김 전압전류법을 이용하여 비소(III)의 벗김 봉우리에 대한 금속 이온의 영향에 대하여 조사하였다. 비소(III)의 환원 벗김 봉우리 이론적인 전위값이 -0.84V(vs. Ag/AgCl)인데 비하여, 0.1N- 염산을 사용하였을 때 전위값은 -0.79V(vs. Ag/AgCl)이고, 여기에 구리(II)를 10배 첨가하였을 때 -0.84V로써 이론적인 전위값과 일치하였으며 전류값은 $0.86{\mu}A$로 가장 높게 나타났다. 비소(III)의 벗김 봉우리를 증가시키는 금속이온으로 납(II), 구리(II) 등이 있었고, 특히 구리(II)이온이 비소(III)의 벗김 봉우리를 가장 많이 증가시켰다.

• 산업식품공학
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• 제21권2호
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• pp.180-186
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• 2017

Salt, as food, is the most essential element for human survival due to its significant physiological functions. Here, we report the simultaneous detection of Pb and Cd in sea salt by square wave anodic stripping voltammetry (SWASV). Stripping voltammetric measurements were conducted using a manufactured rotating disk electrode system (MRDES). The detection limit was $3.6{\pm}0.18{\mu}gL^{-1}$ for Pb and $3.9{\pm}0.37{\mu}gL^{-1}$ Cd in NaCl solution. When the pH increased from 5.5 to 8.5, the peak currents of Pb and Cd decreased. At a pH of 8.3, the ratio of the current drop compared with that at a pH of 5.5 was 0.6 for Pb and 0.73 for Cd. The concentrations corrected by the current drop are in agreement with the concentrations obtained with ICP (inductively coupled plasma). This system demonstrates the reliable detection of heavy metals in aqueous media and, at a high $Na^+$ concentration, the successful application for the determination of Pb and Cd in sea salts.

• 약학회지
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• 제27권1호
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• pp.1-10
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• 1983

Voltammetric deposition and differential pulse anodic stripping (DPASV) of Ge(IV)at a gold electrode was investigated. Germanium (IV) exhibits two stripping peaks by DPASV in sodium borate solution, the first peak at about -1.1v. vs SCE and the second one, in the range of -0.6 to -0.2v. vs SCE. Factors affecting the sensitivity and precision included the nature of working electrode, supporting electrolytes, deposition potential, deposition time, pH, pulse height, voltage scan rate. The relative standard deviation of the measurements of the peak currents, for 100ng/ml Ge(IV), was less than ${\pm}3%$. The detection limit of Ge(IV) was 0.01ng/ml. Percent recovery in the extraction procedure of Ge(IV) from matrices by benzene in c-HCl, followed by back extraction with saturated borax solution, ranged from 96 to 104%.

• 한국응용과학기술학회지
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• 제28권1호
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• pp.15-21
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• 2011

Threelectrodes systems were used in stripping voltammetry (SW) and cyclic voltammetry (CV) instead of the expensive platinum and Ag/AgCl reference electrodes. Moreover, the electrolyte solution was used with deep seawater, which can reduce water pollution, is more eco-friendly, and has a lower cost. The analytical optimum parameters measured via CV and SW and with working ranges were obtained from 10 to 80 ug/L using fluorine immobilized on a graphite pencil electrode (FE). Under the optimum conditions, the analytical detection limit of 6.30 ug/LAu was obtained. The results of the study can be applied to diagnostic assay for natural minerals and human finger tissue.

• Bulletin of the Korean Chemical Society
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• 제32권9호
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• pp.3501-3504
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• 2011

• Korean Chemical Engineering Research
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• 제50권5호
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• pp.933-937
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• 2012

본 연구에서는 환경오염을 발생시키는 주요한 중금속 물질의 하나인 구리를 상대적으로 쉽게 검출하기 위해, CNT 전극 및 벗김전압전류법을 이용하여 구리 금속의 감도 향상을 위한 최적조건 및 민감도를 평가하였다. 또한 구리의 벗김반응이 발생될 때의 반응 메카니즘에 대한 연구도 수행하였다. 이를 위해, 네모파 벗김전압전류법 및 선형주사 전압 전류법등의 전기화학적 분석법이 이용되었다. 평가 결과, 네모파 벗김전압전류법의 최적조건으로, 15 mV의 네모파증폭율, 60 Hz의 주파수, -1.0V vs. Ag/AgCl의 석출전위 및 200초의 석출시간이 결정되었다. 구리 금속의 민감도를 측정한 결과 $1.824{\mu}A/{\mu}M$의 민감도를 얻을 수 있었다. 선형주사 전압전류법을 이용하여 구리의 벗김반응에 영향을 끼치는 인자를 평가하였을 때, 확산반응 보다는 표면반응이 구리의 벗김반응 성능에 영향을 끼치는 것으로 측정되었다. 이러한 전기화학적 분석 결과가 다른 참고문헌들과 비교되어졌고, 구리금속의 민감도 측면에서 본 연구에서 제안한 CNT 전극의 우수함이 입증되었다.

• 분석과학
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• 제11권5호
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• pp.400-403
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• 1998

The germanium content of the cultivated Korean medicinal herbs in several growing district was determined by adsorption stripping voltammetry. The optimum conditions in germanium determination were as following: deposition time; 120 sec, deposition potential; -0.9 volts vs. Ag/AgCl, and frequency; 100 Hz in $5.0{\times}10^{-2}M$ perchloric acid supporting electrolyte solution containing $8.0{\times}10^{-2}M$ catechol. Calibration curve was shown a good lineality in the range of 0.4 ppb to 2.0 ppm and the detection limit was 0.08 ppb. There was a large difference in content of the cultivated hermit leaf according to growing district such as 29.7~385.7 ppm and the content of nontreated hermit leaf was higher than the processed health foodstuffs. The content of the Korean ginseng (5 years) was 83 ppm while the Korean herb of life was 214 ppm.

• 분석과학
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• 제8권1호
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• pp.25-32
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• 1995

구리이온(II)과 티오글리콜산의 착물인 CuRS를 HMDE(Hanging Mercury Drop Electrode)에 흡착시켜 음극으로 주사하는 흡착벗김 전압전류법으로 미량의 티오글리콜산을 정량하는 방법을 고찰하였다. 지지 전해질로는 pH 6.5 인산염 완충용액과 pH 9.5 붕산염 완충용액을 사용하였고, 최적 조건은 구리이온(II) 농도 $1{\times}10^{-4}M$, 흡착 축적 전위 -0.2V, 흡착 축적 시간 60초, 그리고 주사 속도 20mV/sec이다. 이 때 티오글리콜산의 검출 한계는 $1{\times}10^{-9}M$이다. 이 조건하에서 콜드 파마액과 제모제 속에 포함된 티오글리콜산의 함량을 구하였다.

• 분석과학
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• 제6권1호
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• pp.47-55
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• 1993

구리 착물을 수은 방울 전극에 흡착시키는 방법을 이용하여 음극 벗김 전압전류법으로 황화이온 존재하에서 미량의 시안화물을 효과적으로 정량할 수 있는 방법을 연구하였다. 염화칼륨과 인산염의 완충 용액(pH=7.0) 중에서 구리 이온 농도를 $1.0*10^{-3}M$로 유지하고서 석출 전위 -0.30V, 석출 시간 3.0분에서 약 500배의 황화이온이 있을 때 시안화이온의 검출 한계는 $2.0*10^{-7}M$이었다.

• Bulletin of the Korean Chemical Society
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• 제31권11호
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• pp.3077-3083
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• 2010

The electrochemical detection of As(III) was investigated on a platinum-iron(III) nanoparticles modified multiwalled carbon nanotube on glassy carbon electrode(nanoPt-Fe(III)/MWCNT/GCE) in 0.1 M $H_2SO_4$. The nanoPt-Fe(III)/MWCNT/GCE was prepared via continuous potential cycling in the range from -0.8 to 0.7 V (vs. Ag/AgCl), in 0.1 M KCl solution containing 0.9 mM $K_2PtCl_6$ and 0.6 mM $FeCl_3$. The Pt nanoparticles and iron oxide were co-electrodeposited into the MWCNT-Nafion composite film on GCE. The resulting electrode was examined by cyclic voltammetry (CV), scanning electron microscopy (SEM), and anodic stripping voltammetry (ASV). For the detection of As(III), the nanoPt-Fe(III)/MWCNT/GCE showed low detection limit of 10 nM (0.75 ppb) and high sensitivity of $4.76\;{\mu}A{\mu}M^{-1}$, while the World Health Organization's guideline value of arsenic for drinking water is 10 ppb. It is worth to note that the electrode presents no interference from copper ion, which is the most serious interfering species in arsenic detection.