• 약학회지
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• 제29권3호
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• pp.144-151
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• 1985

Cathodic stripping voltammetric determination of traces of selenium in plant samples was studied. Stripping peak of selenium (IV) from Cu-Se intermettalic deposit in acidic media containing copper (II) ion is specific, highly sensitive and well defined, is successfully used for the quantitative determination of selenuin down to the level of 1ng/ml. Sample is burnt in a calorimeter bomb under the oxygen pressure of 40atm. and the selenium is absorbed in 0.1M NaOH. After the solution is filtrated, concentrated and acidified with HCl, then passed through a column of cation exchange resin in the $H^{+}$ form(Dowex 50X-8). The column eluate is analyzed for selenium by differential pulse cathodic stripping voltammetric method. Analytical results of selenium for NBS SMR is well agreement with the certified values. Results are given for a series of plant materials.

• 대한화학회지
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• 제57권5호
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• pp.568-573
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• 2013

A selective and sensitive method for simultaneous determination of copper in blood by adsorptive differential pulse cathodic stripping voltammetry is presented. The procedure involves an adsorptive accumulation of Cu(II)-ETSC (4- ethyl-3-thiosemicarbazide) on a hanging mercury drop electrode, followed by a stripping voltammetry measurement of reduction current of adsorbed complex at about -715 mV. The optimum conditions for the analysis of copper (II) ion are : pH 10.3, concentration of 4-ethyl-3-thiosemicarbazide $3.25{\times}10^{-6}$ M and an accumulation potential of -100 mV. The peak current is proportional to the concentration of copper over the range 0.003-125 ng/mL with a detection limit of 0.001 ng/mL and an accumulation time of 60 s. Moreover, with the use of the proposed method, there is a considerable improvement in the detection limit, the linear dynamic range and the deposition time, compared with the methods of adsorptive stripping voltammetry for the determination of copper. The developed method was validated by analysis of whole blood certified reference materials.

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

• 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.

• 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.

• Journal of Electrochemical Science and Technology
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• 제7권3호
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• pp.241-244
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• 2016

Anodic stripping voltammetry (ASV) is successfully applied in mM level detection of mercury ion in an electroplating bath which is currently used in preparing a cathodic electrolyzer. Glassy carbon electrode is used for the detection and the optimum condition obtained is 10 s deposition at −1.4 V vs. Ag/AgCl and stripping by scanning from −1.4 to +0.4 V vs Ag/AgCl at 50 mV/s. By applying the method, the mercury ion concentration in the electroplating bath could be successfully monitored during the plating.

• 대한화학회지
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• 제32권2호
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• pp.130-134
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• 1988

수은방울전극에서 바로 시안이온을 시차펄스음극벗김 전압전류 법으로 측정한 결과 검출한계를 낮출수가 있었다. 가장 알맞는 실험조건은 다음과 같다. : 0.1M KCl-0.01M 인산염 지지전해질, pH 7, 석출전위 0.00V, 그리고 석출시간 3분이었다. 이 조건에서 검출한계는 $3{\times}10^{-7}M$ (8ppb) $CN^-$이다.

• 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.

• 한국응용과학기술학회지
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• 제29권4호
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• pp.626-630
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• 2012

Diagnosis with an ex-vivo gold sensor was done using a modified fluorine-doping sensor, and cyclic voltammetry (CV) redox potentials of 0.4 V anodic and -0.2 V cathodic were obtained. Both peak currents were optimized using square-wave (SW) stripping voltammetry, and an analytical working range of 10-80 ug/L SW was attained. The precision of the 10-mg/L Au was 0.765 (n=8) RSD under the optimum conditions, and the analytical detection limit approached 0.006 ug/L (S/N=3) with only a 60 sec accumulation time. The developed method was used to examine the mouse droppings for medicinal diagnosis.

• 전기화학회지
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• 제7권1호
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• pp.9-15
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• 2004

Cyclic voltammetry and chronocoulometry have been used for characterization of catechol violet (CV) at the hanging mercury drop electrode in acetic acid-sodium acetate buffer solution. At pH 2.94 a nearly symmetric cyclic voltammetric wave due to an irreversible weak adsorption of CV on mercury was obtained at concentration of $0.53{\mu}mol\;dm ^{-3}$. Under these conditions, CV adsorbes in a monolayer. Upon increasing the concentration, the symmetry of the wave decreases; it can be attributed to a mixed diffusion adsorption process. The amount of the adsorbed catechol violet on the HMDE expressed as surface concentration as well as the surface areaf occupied by one molecule$(\sigma)$ were calculated. It was found that the values obtained for f and o utilizing cyclic voltammetric and chrono-coulometry are almost identical. A 1:1 and 1:2 Th (IV)-CV complexes are formed on addition of thorium (IV) to catechol violet. These complexes are adsorbed and reduced on the HMDE at more negative potentials than the peak potential of free CV, Using the square-wave (SW) technique, the adsorptive cathodic stripping voltammetry, ACSV, of these complexes was studied. It was found that the SW-ACSV of Th(IV)-CV can be applied to the determination of thorium at the nanomole level. Optimum conditions and the analytical method of determination were presented and discussed.