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Electrochemical Behavior of Light Lanthanide Ions in Nonaqueous Solution, Flow Injection Determination and Photochemical Characterization of Eight Coordinated Chelates of Heavy Metal Ions (Part I) Electrochemical Behavior of Light Lanthanide Ions in Nonaqueous Solution
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1994, v.7 no.3, pp.361-369
Kang,
S., Pak,
C., Do,
L., Song,
M., &
Kim,
I.
(1994). Electrochemical Behavior of Light Lanthanide Ions in Nonaqueous Solution, Flow Injection Determination and Photochemical Characterization of Eight Coordinated Chelates of Heavy Metal Ions (Part I) Electrochemical Behavior of Light Lanthanide Ions in Nonaqueous Solution. Analytical Science and Technology, 7(3), 361-369.
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Abstract
Voltammetric behavior of some light lanthanide ions(<TEX>$La^{3+}$</TEX>, <TEX>$Pr^{3+}$</TEX>, <TEX>$Nd^{3+}$</TEX>, <TEX>$Sm^{3+}$</TEX> and <TEX>$Eu^{3+}$</TEX>) in acetonitrile(AN) and dimethylformamide(DMF) has been investigated by direct current, differential pulse polarography and cyclic voltammetry. The reduction of <TEX>$La^{3+}$</TEX>, <TEX>$Pr^{3+}$</TEX> and <TEX>$Nd^{3+}$</TEX> in 0.1M TEAP proceeded directly to the metallic state through three-electron charge transfer of irreversible process where as <TEX>$Sm^{3+}$</TEX> and <TEX>$Eu^{3+}$</TEX> proceeded by charge transfer of two steps. As the results of the cyclic voltammetric investigation, the first step reduction of <TEX>$Sm^{3+}$</TEX> and <TEX>$Eu^{3+}$</TEX> were a quasireversible reaction, the second step reductions were an irreversible reaction. The cathodic peak currents of the differential pulse polarogram showed adsorptive properties at lower sweep rates and high concentrations of these metal ions. The peak potenital was shifted to a negative petential and the peak current decreased with the increase of percentage of water in AN. On the other hand, the peak potential was shifted to a positive potential and the peak current decreased with an increased percentage of water in DMF.
- keywords
- Voltammetry, Lanthanide ions, Nonaqueous solution
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