Enhancement of sensitivity of electrochemical heavy metal detection by evaporative concentration using a super-hydrophobic surface

A novel method to concentrate a droplet of a sample solution on a chip evaporatively and improve the sensitivity for electrochemical heavy metal detection was developed. The chip consisted of a working electrode and a Ag/AgCl reference electrode surrounded by a super-hydrophobic surface. When a drop...

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Bibliographic Details
Published inThe 13th International Conference on Solid-State Sensors, Actuators and Microsystems, 2005. Digest of Technical Papers. TRANSDUCERS '05 Vol. 2; pp. 1207 - 1210 Vol. 2
Main Authors Yanagimachi, I., Nashida, N., Iwasa, K., Suzuki, H.
Format Conference Proceeding
LanguageEnglish
Published IEEE 2005
Subjects
Bismuth
Chemical analysis
Chemical sensors
Electrodes
Fabrication
Gas detectors
Gold
Laboratories
Pollution measurement
Surface contamination
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Summary:A novel method to concentrate a droplet of a sample solution on a chip evaporatively and improve the sensitivity for electrochemical heavy metal detection was developed. The chip consisted of a working electrode and a Ag/AgCl reference electrode surrounded by a super-hydrophobic surface. When a droplet of an aqueous solution placed on the area was evaporated, it shrank to the sensitive area making contact with the sensitive area. This effectively concentrated the analyte heavy metal ions. Anodic stripping voltammetry was conducted using the system and the technique. To analyze various heavy metal ions, a bismuth or gold electrode was used as the working electrode. A significant increase in peak height was observed by the evaporative concentration, and the effect was enhanced as the volume of the solution increased and the area of the sensitive area decreased.
ISBN:0780389948
9780780389946
ISSN:2159-547X
DOI:10.1109/SENSOR.2005.1497295