A new electrochemical sensor for heavy-metal ions by the surface-polarization controlling method

Author

Ju, Myun Jong ; Hayashi, Kenshi ; Toko, Kiyoshi ; Yang, Do-Hyeon ; Lee, Seung-Woo ; Kunitake, Toyoki

Author_Institution

Kitakyushu Found. for the Adv. of Ind., Sci. & Technol., Japan

Volume

2

fYear

2005

fDate

5-9 June 2005

Firstpage

1876

Abstract

A new electrochemical sensor with high sensitivity and selectivity for heavy-metal ions was proposed. The sensor was based on the electrochemical impedance spectroscopy (EIS) attributing to a constant phase element (CPE) behavior under dynamically controlled electrode potential. With the measurements of the CPE behavior by the surface-polarization controlling method, various heavy-metal ions could be easily detected and discriminated. No interference of counter anions such as Cl^-, NO₃^- and CH₃COO^$was observed, and the same metal ions gave similar sensor response patterns regardless of the counter anions. Especially, the present method offers a high sensitivity of ppb levels for the most highly toxic elements, i.e., Hg²⁺ and Hg⁺.

Keywords

carbon compounds; chemical variables measurement; chlorine; electrochemical sensors; mercury (metal); negative ions; nitrogen compounds; positive ions; CPE behavior; Cl^-; Hg⁺; Hg²⁺; NO₃^-; anions; constant phase element; electrochemical impedance spectroscopy; electrochemical sensor; electrode potential; heavy-metal ions; sensor response pattern; surface-polarization controlling method; toxic elements; Chemicals; Counting circuits; Electrochemical impedance spectroscopy; Electrodes; Industrial control; Instruments; Mass spectroscopy; Pollution measurement; Sensor phenomena and characterization; Surface impedance;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Sensors, Actuators and Microsystems, 2005. Digest of Technical Papers. TRANSDUCERS '05. The 13th International Conference on

Print_ISBN

0-7803-8994-8

Type

conf

DOI

10.1109/SENSOR.2005.1497462

Filename

1497462