High-temperature potentiometry: modulated response of ion-selective electrodes during heat pulses.

Analytical Chemistry
Karin Y Chumbimuni-TorresJoseph Wang

Abstract

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 microM 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.

References

Mar 31, 2000·Analytical Chemistry·E BakkerP Bühlmann
Aug 11, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Gerd-Uwe FlechsigPeter Gründler
Feb 16, 2006·Analytical Chemistry·Karin Y Chumbimuni-TorresEric Bakker
May 19, 2007·Analytical Chemistry·Chun-Ze LaiPhilippe Bühlmann
Feb 15, 2008·Analytical Chemistry·Gastón A CrespoF Xavier Rius
Aug 2, 2008·Analytical Chemistry·Jean-Pierre VederEric Bakker
Oct 31, 2008·Talanta·J WangB Tian
Aug 25, 2009·Biosensors & Bioelectronics·Heiko DuwenseeGerd-Uwe Flechsig

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Citations

May 19, 2010·Analytical Chemistry·Benjamin J PrivettMark H Schoenfisch
Apr 7, 2010·Analytical Chemistry·Elsayed M ZahranLeonidas G Bachas
Feb 20, 2020·Talanta·Emilia StelmachAgata Michalska
Jan 16, 2018·Analytical Chemistry·Ewa JaworskaAgata Michalska

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