The University of Southampton
University of Southampton Institutional Repository

Optoelectrochemical sensor for lead based on electrochemically-assisted solvent extraction

Optoelectrochemical sensor for lead based on electrochemically-assisted solvent extraction
Optoelectrochemical sensor for lead based on electrochemically-assisted solvent extraction
A thin film containing the complexing agent 2-(5-bromo-2-pyridylazo)-5-(diethylamino)phenol (BrPADAP) deposited on the surface of an indium tin oxide (ITO) electrode has been used as a colorimetric sensor for lead. The sensor is based on a new electrochemically assisted solvent extraction method. When a cathodic potential was applied to the thin-film sensing layer, lead ions were extracted from the aqueous solution into the film resulting in an increase of absorbance at 550 nm. The magnitude of the absorbance change was linearly dependent on the concentration of lead in the range 0–5 ppm with an estimated limit of detection for a simple spectrophotometric method better than 250 ppb. The sensor was reset for a fresh measurement by applying an anodic potential. The prospects for using this electroassisted extraction method in conjunction with the optical waveguide evanescent field detection as a new integrated sensor for trace analysis are discussed. A sensitivity better than 10 ppb is predicted for this configuration.
0925-4005
115-121
Wilson, R.
94eba368-b33f-4071-beb6-dac98ef23651
Schiffrin, D.J.
f9d7c157-18a5-4532-9ea2-80755bdc0cc0
Luff, B.J.
04d280ab-ae84-4715-9dad-6a1120050ccd
Wilkinson, J.S.
73483cf3-d9f2-4688-9b09-1c84257884ca
Wilson, R.
94eba368-b33f-4071-beb6-dac98ef23651
Schiffrin, D.J.
f9d7c157-18a5-4532-9ea2-80755bdc0cc0
Luff, B.J.
04d280ab-ae84-4715-9dad-6a1120050ccd
Wilkinson, J.S.
73483cf3-d9f2-4688-9b09-1c84257884ca

Wilson, R., Schiffrin, D.J., Luff, B.J. and Wilkinson, J.S. (2000) Optoelectrochemical sensor for lead based on electrochemically-assisted solvent extraction. Sensors and Actuators B: Chemical, 63 (1-2), 115-121. (doi:10.1016/S0925-4005(00)00332-4).

Record type: Article

Abstract

A thin film containing the complexing agent 2-(5-bromo-2-pyridylazo)-5-(diethylamino)phenol (BrPADAP) deposited on the surface of an indium tin oxide (ITO) electrode has been used as a colorimetric sensor for lead. The sensor is based on a new electrochemically assisted solvent extraction method. When a cathodic potential was applied to the thin-film sensing layer, lead ions were extracted from the aqueous solution into the film resulting in an increase of absorbance at 550 nm. The magnitude of the absorbance change was linearly dependent on the concentration of lead in the range 0–5 ppm with an estimated limit of detection for a simple spectrophotometric method better than 250 ppb. The sensor was reset for a fresh measurement by applying an anodic potential. The prospects for using this electroassisted extraction method in conjunction with the optical waveguide evanescent field detection as a new integrated sensor for trace analysis are discussed. A sensitivity better than 10 ppb is predicted for this configuration.

Text
1901 - Author's Original
Download (726kB)

More information

Accepted/In Press date: 17 January 2000
Published date: 10 April 2000

Identifiers

Local EPrints ID: 13656
URI: http://eprints.soton.ac.uk/id/eprint/13656
ISSN: 0925-4005
PURE UUID: 0e8c3128-c58e-4bdd-b1a5-e53ce51f5af9
ORCID for J.S. Wilkinson: ORCID iD orcid.org/0000-0003-4712-1697

Catalogue record

Date deposited: 12 Jan 2005
Last modified: 16 Mar 2024 02:33

Export record

Altmetrics

Contributors

Author: R. Wilson
Author: D.J. Schiffrin
Author: B.J. Luff
Author: J.S. Wilkinson ORCID iD

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×