High sensitive detection of sulfuric compounds using electrochemical impedance

Attention has been focused recently on the harmful effects and malodor of sulfuric compounds; therefore, various laws have been enacted to regulate environmental concentration and use of most sulfuric compounds. In order to avoid sulfuric malodor, a reasonable, easy, sensitive, and selective measuri...

Full description

Saved in:
Bibliographic Details
Published in:IEEJ transactions on electrical and electronic engineering 2009-05, Vol.4 (3), p.372-377
Main Authors: Yamaguchi, Akifumi, Masunaga, Kumi, Hayashi, Kenshi, Toko, Kiyoshi
Format: Article
Language:English
Subjects:
adsorption
Dimethyl
Electrochemical impedance spectroscopy
Environmental legislation
Impedance
Laws
Microorganisms
odor
Polarization
sensor
sulfuric compounds
Surface chemistry
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Attention has been focused recently on the harmful effects and malodor of sulfuric compounds; therefore, various laws have been enacted to regulate environmental concentration and use of most sulfuric compounds. In order to avoid sulfuric malodor, a reasonable, easy, sensitive, and selective measuring method to detect sulfuric compounds is required. In this research, we adopted the specific adsorption of sulfuric compounds to a metal surface as a sensing principle. It was suggested that polarization is an important factor of molecular recognition from results obtained by quartz crystal microbalance (QCM), ellipsometry, and stripping voltammetry (SV). Therefore, we used cyclic surface polarization impedance (cSPI), based on electrochemical impedance spectroscopy (EIS) under the dynamic control of an electrode potential and a constant phase element (CPE) impedance, as a detecting method for sulfuric compounds. As a result, we could detect three sulfuric compounds, hydrogen sulfide, methyl mercaptan, and dimethyl sulfide, with this method at sub ppb levels and discriminate the three sulfuric compounds. Copyright © 2009 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
ISSN:1931-4973
1931-4981
DOI:10.1002/tee.20420