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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.

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Published date: 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

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Date deposited: 12 Jan 2005
Last modified: 18 Feb 2021 16:32

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Contributors

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

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