• Title/Summary/Keyword: DPASV

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Anodic Stripping Voltammetric Determinations of Zinc, Cadmium, Lead and Copper in Freshwater and Sediment (담수 및 퇴적물에 함유된 아연, 카드뮴, 납 및 구리의 산화전극 벗김 전압전류법 정량)

  • Hahn, Young Hee;Yoo, Jeong Yeon
    • Journal of the Korean Chemical Society
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    • v.41 no.4
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    • pp.180-185
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    • 1997
  • Zinc, cadmium, lead and copper were simultaneously determined by depositing metals at - 1.200 V vs. a Ag/AgCl(sat. KCl) reference electrode for 150 seconds on a hanging mercury drop electrode(HMDE) or a thin mercury film electrode(TMFE), followed by scanning towards anodic direction using differential pulse voltammetric(DPASV) and square wave voltammetric(SWASV) techniques. The linear calibration curves were obtained for four metal ions simultaneously determined by DPASV with a HMDE in the concentration range between 20 and 100 ppb. However, the linear calibration plots were obtained only for $Cd^{2+}$ and $Pb^{2+}$ in the simultaneous determinations with a TMFE in the concentration range up to 100 ppb using DPASV and up to 10 ppb using SWASV. DPASV with a TMFE was about 15 times more sensitive than DPASV with a HMDE for simultaneous determinations of $Cd^{2+}$ and $Pb^{2+}$. SWASV was about 5 times more sensitive than DPASV at a TMFE. Concentrations of zinc in seven different sediment samples determined by DPASV with a HMDE and inductively coupled plasma-mass spectrometry were compared, resulting with an excellent correlation coefficient of 0.9993 and with no significant difference between two methods after t-test.

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Simultaneous Detection of Cd (II), Pb (II), Cu (II), and Hg (II) Ions in Dye Waste Water Using a Boron Doped Diamond Electrode with DPASV

  • Yoon, Jang-Hee;Yang, Jee-Eun;Kim, Jong-Phil;Bae, Jong-Seong;Shim, Yoon-Bo;Won, Mi-Sook
    • Bulletin of the Korean Chemical Society
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    • v.31 no.1
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    • pp.140-145
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    • 2010
  • The simultaneous detection of Cd (II), Pb (II), Cu (II), and Hg (II) ions in aqueous medium using a BDD electrode with DPASV is described. XPS was used to characterize the chemical states of trace metal ions deposited on the BDD electrode surface. Experimental parameters that affect response, such as pH, deposition time, deposition potential, and pulse amplitude were carefully optimized. The detection limits for Cd (II), Pb (II), Cu (II), and Hg (II) ions were 3.5 ppb, 2.0 ppb, 0.1 ppb and 0.7 ppb, respectively. The application of the BDD electrode on the electrochemical pretreatment for the simultaneous metal detection in the dye waste water was also investigated.

Determination of Germanium(IV) by Differential Pulse Anodic Stripping Voltammetry(I) (Differential Pulse Anodic Stripping Voltammetry법에 의한 게르마늄 분석에 관한 연구(제1보))

  • 문동철
    • YAKHAK HOEJI
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    • v.27 no.1
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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%.

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Simultaneous Determination of Cd2+, Pb2+, Cu2+ and Hg2+ at a Carbon Paste Electrode Modified with Ionic Liquid-functionalized Ordered Mesoporous Silica

  • Zhang, Penghui;Dong, Sheying;Gu, Guangzhe;Huang, Tinglin
    • Bulletin of the Korean Chemical Society
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    • v.31 no.10
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    • pp.2949-2954
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    • 2010
  • Ionic liquid-functionalized ordered mesoporous silica SBA-15 modified carbon paste electrode (CISPE) was fabricated and its electrochemical performance was investigated by cyclic voltammetry, electrochemical impedance spectra. The electrochemical behavior of $Cd^{2+}$, $Pb^{2+}$, $Cu^{2+}$ and $Hg^{2+}$ at CISPE was studied by differential pulse anodic stripping voltammetry (DPASV). Compared with carbon paste electrode, the stripping peak currents had a significant increase at CISPE. Under the optimized conditions, the detection limits were $8.0{\times}10^{-8}\;M$ ($Cd^{2+}$), $4.0{\times}10^{-8}\;M$ ($Pb^{2+}$), $6.0{\times}10^{-8}\;M$ ($Cu^{2+}$), $1.0{\times}10^{-8}\;M$ ($Hg^{2+}$), respectively. Furthermore, the present method was applied to the determination of $Cd^{2+}$, $Pb^{2+}$, $Cu^{2+}$ and $Hg^{2+}$ in water samples and people hair sample.