GalvaPot, a custom-made combination galvanostat/potentiostat and high impedance potentiometer for decentralized measurements of ionophore-based electrodes

S Jeanneret; G A Crespo; M Ghahraman Afshar; Eric Bakker

doi:10.1016/j.snb.2014.10.084

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GalvaPot, a custom-made combination galvanostat/potentiostat and high impedance potentiometer for decentralized measurements of ionophore-based electrodes

Journal article

Peer reviewed

GalvaPot, a custom-made combination galvanostat/potentiostat and high impedance potentiometer for decentralized measurements of ionophore-based electrodes

S Jeanneret, G A Crespo, M Ghahraman Afshar and Eric Bakker

Sensors and Actuators B: Chemical, Vol.207(Part A), pp.631-639

2015

DOI: https://doi.org/10.1016/j.snb.2014.10.084

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Abstract

Analytical Chemistry

Materials Engineering

Optical Physics

custom made

potentiometer

potentiostat

chronopotentiometry

coulometry

perm-selective membranes

We report here on a portable, custom-made instrument for decentralized measurements with ionophore based electrodes. It allows one to perform most common electrochemical protocols based on applied current or potential as well as zero current potentiometry measurements. Each protocol is customizable via a programmable interface by use of either an external PC or a touch screen panel on the device. The programmable interface provides flexibility to trigger peripheral devices for the additional implementation of actuators, pumps and other external devices in the electrochemical routines. To characterize the electronic performance of the instrument, three different electrochemical protocols were used with ionophore based electrodes and compared with a commercial work station: (1) open circuit potentiometric measurements with calcium ion-selective membranes; (2) chronoamperometry based on three successive pulses with simultaneous control of fluidic delivery by a peristaltic pump and switching valve, followed by on board current integration to obtain a coulometric readout; (3) a chronopotentiometric protocol using protamine selective membranes with current pulses of 5-s duration, including an automatic computation of the time-derivative to find the transition time as the analytical signal. At 500 g, the instrument is portable yet sufficiently versatile for performing and analyzing most electrochemical measurements without the need for an external computer. It may become an attractive tool for applications in environmental and clinical analysis where field portability, flexibility and integration are desired.

Details

Title: GalvaPot, a custom-made combination galvanostat/potentiostat and high impedance potentiometer for decentralized measurements of ionophore-based electrodes
Authors: S Jeanneret (Author) - University of Geneva, Switzerland
G A Crespo (Author) - University of Geneva, Switzerland
M Ghahraman Afshar (Author) - University of Geneva, Switzerland
Eric Bakker (Author) - University of Geneva, Switzerland
Publication details: Sensors and Actuators B: Chemical, Vol.207(Part A), pp.631-639
Publisher: Elsevier BV
Date published: 2015
DOI: 10.1016/j.snb.2014.10.084
ISSN: 0925-4005
Organisation Unit: University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99448818302621
Output Type: Journal article

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Web Of Science research areas: Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation