High-Temperature Potentiometry: Modulated Response of Ion-Selective Electrodes During Heat Pulses

K Y Chumbimuni-Torres; C Thammakhet; M Galik; P Calvo-Marzal; Jie Wu; Eric Bakker; G U Flechsig; J Wang

doi:10.1021/ac902191h

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High-Temperature Potentiometry: Modulated Response of Ion-Selective Electrodes During Heat Pulses

Journal article

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Peer reviewed

High-Temperature Potentiometry: Modulated Response of Ion-Selective Electrodes During Heat Pulses

K Y Chumbimuni-Torres, C Thammakhet, M Galik, P Calvo-Marzal, Jie Wu, Eric Bakker, G U Flechsig and J Wang

Analytical Chemistry, Vol.81(24), pp.10290-10294

2009

DOI: https://doi.org/10.1021/ac902191h

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Abstract

solid-contact

drinking-water

membrane

The concept of locally heated polymeric membrane potentiometric sensors is introduced here for the first time. This is accomplished in an all solid state sensor configuration, utilizing poly(3-octylthiophene) as the intermediate layer between the ion-selective membrane and underlying substrate that integrates the heating circuitry. Temperature pulse potentiometry (TPP) gives convenient peak-shaped analytical signals and affords an additional dimension with these sensors. Numerous advances are envisioned that will benefit the field. The heating step is shown to give an increase in the slope of the copper-selective electrode from 31 to 43 mV per 10-fold activity change, with a reproducibility of the heated potential pulses of 1% at 10 mu M copper levels and a potential drift of 0.2 mV/h. Importantly, the magnitude of the potential pulse upon heating the electrode changes as a function of the copper activity, suggesting an attractive way for differential measurement of these devices. The heat pulse is also shown to decrease the detection limit by half an order of magnitude.

Details

Title: High-Temperature Potentiometry: Modulated Response of Ion-Selective Electrodes During Heat Pulses
Authors: K Y Chumbimuni-Torres (Author) - University of San Diego, United States
C Thammakhet (Author) - Prince of Songkla University, Thailand
M Galik (Author) - University of San Diego, United States
P Calvo-Marzal (Author) - University of San Diego, United States
Jie Wu (Author) - University of San Diego, United States
Eric Bakker (Author) - Curtin University of Technology
G U Flechsig (Author) - University of Rostock, Germany
J Wang (Author) - University of San Diego, United States
Publication details: Analytical Chemistry, Vol.81(24), pp.10290-10294
Publisher: American Chemical Society
Date published: 2009
DOI: 10.1021/ac902191h
ISSN: 0003-2700
Organisation Unit: University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99450139302621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Chemistry, Analytical