Differential Pulse Voltammetric Determination of Iron(II) ion with a Nafion-Ethylenediamine Modified Glassy Carbon Electrode (II)

전체 글

(1)Journal of the Korean Chemical Society 2003, Vol. 47, No. 2 Printed in the Republic of Korea.

(2) (II)

(3) . Nafion-ethylenediamine.

(4) * †. ‡. .

(5) R&D. (2002. 9. 23 ). #. †. ‡. #. Differential Pulse Voltammetric Determination of Iron(II) ion with a Nafion-Ethylenediamine Modified Glassy Carbon Electrode Kyong Wone Kim, Hee Cheol Kim, Sung-Hyun Kim†, Byung Ho Park‡, Yeon Hee Kim #, Kyong Nam Kim, and Young Chun Ko* Department of Chemical/Environmental Engineering, Daebul University, Sanhori Samhomyeun Youngam-kuhn Chonnam 526-702, Korea † Regional Office of Gwangju-Chonnam Small and Medium Business Administration, Gwangju 502-723, Korea ‡ Kuhmho R & D center, Gwangju 506-040, Korea # Health and Environment Institute of Gwangju 520-837, Korea (Received September 23, 2002). . Perfluorinated sulfonated polymer(Nafion)-ethylenediamine(en) !" #$%

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(14) EF 3. +2. −6. −3. −5. ABSTRACT. Determination of iron(II) ion with a perfluorinated sulfonated polymer(nafion)-ethylenediamine(en) modified glassy carbon electrode was studied. It was based on the chemical reactivity of an immobilized layer(nafionen) to yield complex [Fe(en)3]+2. The oxidation peak potential by differential pulse voltammetry(DPV) was observed at 0.340±0.015 V(vs. Ag/AgCl). The linear calibration curve was obtained in iron(II) ion concentration range 5×10 −6~0.2 10−3M(0.28~11.17 mg/L), and the detection limit(3s) was 1.89×10−5M(1.056 mg/L). Keywords: Iron(II) ion, Differential Pulse Voltammetry(DPV). GTU VW( 4. VX" YZ[3\, ]E^_ ` Y a* b$K 4Ec de f31 Igh'(. .i.j k 3 1. 4EK l'(m !, n 5 o6 (m pq r o's <(m tu v5 ./K a n K wx-@ yz{ | 1. 9:h* 70% }5 A/K <* ~; 115.

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(59) &* è+>5 Àz Table 1. Effect of differential pluse peak current and pontential with a change of the number of renewed electrode successively in pH 3.0 buffer solution containing 1.0×10−4M Fe(II) ion. Preconcentration potential 1.0 V; Preconcentration time 10 min Number of renewed electrode. Peak current (µA). Peak pontential (V) vs. Ag/AgCl. 0 1 2 3 4. 4.249 4.128 3.967 3.750 3.501. 0.340 0.340 0.339 0.338 0.336. Journal of the Korean Chemical Society.

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(106) EF5 ç/01. Fe(II) 3. 2+. −4. −4. −4. −1. −1. Fig. 1. Dependence of differential pulse peak current for pH variation containing 1.0×10−4M Fe(II) ion at a nafion-en modified electrode. Preconcentration time 10 min; Preconcentration potential 1.0 V; Scan rate 20 mV/sec; Pulse amplitude 50 mV. 2003, Vol. 47, No. 2. 3. 2+.

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(108) . Fig. 2. Dependence of differential pulse peak current for a change of en concentration in pH 3.0 buffer solution containing 1.0×10−4M Fe(II) ion. Preconcentration time 10 min; Preconcentration potential 1.0 V; Scan rate 20 mV/sec; Pulse amplitude 50 mV.. Fig. 3. Dependence of differential pulse voltammetric response for the preconcentration potential in pH 3.0 buffer solution containing 1.0×10−4M Fe(II) ion. Preconcentration time 10 min; Scan rate 20 mV/sec; Pulse amplitude 50 mV.. )5

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(150) (II) . 119. Nafion-en. Fig. 5. Cyclic voltammograms for 1.0×10−4M Fe(II) ion at glassy carbon electrode without (a) and (b) with modifying nafion-en. pH 3.0 buffer solution; Scan rate 20 mV/sec; Preconcentration potential 1.0 V; Preconcentration time 10 min.. !"

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(171) 4 |1. nafion-en. −4. 3. Fig. 6. Differential pulse voltammograms for different concentration of Fe(II) ion in pH 3.0 buffer solution, (a) 0 (nafionen modified), (b) 1.0×10−5 (c) 1.0×10−4, and (d) 2.0×10−4M Fe(II) ion. Preconcentration potential 1.0 V; Scan rate 20 mV/sec; Pulse amplitude 50 mV. Table 3. Differential pulse peak current and potential for different concentration of Fe(II) ion in pH 3.0 buffer solution. Preconcentration potential 1.0 V; Preconcentration time 10 min; Scan rate 20 mV/sec; Pulse amplitude 50 mV Concentration of Fe(II)ion (×10−5M). Peak current(ip) (µA). Peak pontential(Ep) (V) vs. Ag/AgCl. 10.5 110.75 11.0 12.0 14.0 16.0 18.0 10.0 20.0. 0.191 0.410 0.529 0.848 1.379 1.915 2.641 3.346 6.433. 0.324 0.332 0.336 0.344 0.344 0.344 0.341 0.340 0.325. 2+. Fe3++ e− → Fe2+ Fe2++3en → [Fe(en)3]2+ at 1.0 V −. [Fe(en)3] +2(nafion-SO3)− → (nafion-SO3)2 [Fe(en)3]2+ 2+. − 3 2. − 3 2. (nafion-SO ) [Fe(en)3]2+ → (nafion-SO ) [Fe(en)3]3+ + e− at 0.34 V. Fe(II) 5@ ÚÛ? h´5 ¯/¢ 5.010 O0.2 10 M(0.28O11.17 mg/L) Fe(II) )-@ nafion-en' −6. −3. 2003, Vol. 47, No. 2. Fig. 7. Standard calibration curve for determination of Fe(II) ion at a nafion-en modified electrode by differential pulse voltammogram in pH 3.0 buffer solution. Preconcentration potential 1.0 V; Scan rate 20 mV/sec; Pulse amplitude 50 mV..

(172)

(173) . 120. Table 4. Detectable concentration and wavelength(or voltage) for iron analysis9 Method. Detectable concentration (mg/L). Wavelength (or Voltage). 0.3~6 0.02~0.5 0.007~100 1.06~11.17(only, Fe(II) ion). 248.3 nm 510 nm 259.94 nm 0.340 V (vs. Ag/AgCl). Atomic absorption spectrometer UV-vis. spectrometer Inductively coupled plasma emission spectrometer Differential pulse voltammetry. ( !"

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(199) . 1. ; ; , 2000. 2. Banner, W.; Jr.; Tong, T. G. Pediatr. Clin. 1986, 33, 393. 3. Edwards, C. Q.; Griffen, L. M.; Goldger, D.; Drummond, C.; Skolnick, M. H.; Kushner, J. P. N. Engl. J. Med. 1988, 318, 1355. 4. Appenzeller, B. M. R.; Duval, Y. B.; Thomas, F.; Block, J. C. Environ. Sci. & Tech., 2002, 36, 646. 5. ; ; , 1998. 6. Cox J. A.; Majda, M. Anal. Chem. 1980, 52, 861. 7. Kim, D. H.; Takeda, K.; Sakugawa, H.; Lee, J. S. Anal. Sci. & Tech., 2001, 14, 510. 8. Ko, Y. C.; Jeong, B. G.; Kim, K. N. J. of Korean Soc. En. Anal, 2001, 4, 57. 9. , 2001-53 (2001. 4. 20)..

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