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KMID : 0385519910040020115
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Analytical Science & Technology
1991 Volume.4 No. 2 p.115 ~ p.123
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Studies on the Electrochemical Behavior of Heavy Lanthanide Ions and the Synthesis, Characterization of Heavy Metal Chelate Complexes
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Kang Sam-Woo
Chang Choo-Hwan
Son Byung-Chan
Suh Moo-Yul
Kim Chae-Kyun
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Abstract
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Electrochemical behavior of some heavy lanthanide ions (Gd3+ Tba+ Dy3+ Ho3+, Era+, Tm3´, Yb3+ and Lu3+) in various supporting electrolytes has been investigated by do polarography, differential pulse polarography and cyclic voltammetry., The peak potentials and the peak currents, their dependency on the concentration and pH effects, the reversibility of the electrode reactions are described.
The reduction of Gd3+, Tba+, Dy3-, Ho´, Era+, Tm3+ and Lu3+ ions in 0.1 M lithium chloride solution proceeds by a three-electron change directly to the metallic state, wherease-the reduc-
tion of Yb" proceeds by a one-electron change followed by a two-electron change.
It was found that, in differential pulse polarography and cyclic voltammetry, the peak potential, peak current and current function showed constant value in the pH range of 4.0--6.0 by varying pH and scan rates. And also the current function is found´ to decrease as the sweep rate is increased when the pH reaches 4.0. This fact may indicate a chemical reaction´ coupled with the electrochemical reaction at lower pH values (pH<4.0). It is also shown that Yb3+. ion is possible to determine voltammetrically within the error of 3.5% in the presence of other competitive lanthanide ions.
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KEYWORD
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Lanthanides, Polarography,Cyclic voltammetry
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