Solid contact ion-selective electrodes for in situ measurements at high pressure
File(s)
Accepted version
Author(s)
Weber, AW
O’Neil, GD
Kounaves, SP
Type
Journal Article
Abstract
Solid contact polymeric ion-selective electrodes (SC-ISEs) have been fabricated using microporous carbon (μPC) as the ion-to-electron transducer, loaded with a liquid membrane cocktail containing both ionophore and additive dissolved in plasticizer. These SC-ISEs were characterized and shown to be suitable for analysis in aqueous environments at pressures of 100 bar. Potassium ISEs, prepared in this manner, showed excellent performance at both atmospheric and elevated pressures, as evaluated by their response slopes and potential stability. These novel SC-ISEs were shown to be capable of measuring K+ at pressures under which traditional liquid-filled ISEs fail. Furthermore, the effect of pressure on the response of these sensors had little or no effect on potential, sensitivity, or limit of detection. High pressure sensor calibrations were performed in standard solutions as well as simulated seawater samples to demonstrate their usefulness as sensors in a deep-sea environment. These novel SC-ISE sensors show promise of providing the ability to make in situ real-time measurements of ion-fluxes near deep-ocean geothermal vents.
Date Issued
2017-05-02
Date Acceptance
2017-04-12
Citation
Analytical Chemistry, 2017, 89 (9), pp.4803-4807
ISSN
0003-2700
Publisher
American Chemical Society
Start Page
4803
End Page
4807
Journal / Book Title
Analytical Chemistry
Volume
89
Issue
9
Copyright Statement
© 2017 American Chemical Society
Subjects
Science & Technology
Physical Sciences
Chemistry, Analytical
Chemistry
DEEP-SEA
CONDUCTING POLYMERS
OCEAN
STABILITY
MEMBRANE
SENSORS
CARBON
VENT
(MICRO)ELECTRODES
POTENTIOMETRY
0301 Analytical Chemistry
0904 Chemical Engineering
0399 Other Chemical Sciences
Analytical Chemistry
Notes
doi: 10.1021/acs.analchem.7b00366 Solid contact polymeric ion-selective electrodes (SC-ISEs) have been fabricated using microporous carbon (μPC) as the ion-to-electron transducer, loaded with a liquid membrane cocktail containing both ionophore and additive dissolved in plasticizer. These SC-ISEs were characterized and shown to be suitable for analysis in aqueous environments at pressures of 100 bar. Potassium ISEs, prepared in this manner, showed excellent performance at both atmospheric and elevated pressures, as evaluated by their response slopes and potential stability. These novel SC-ISEs were shown to be capable of measuring K+ at pressures under which traditional liquid-filled ISEs fail. Furthermore, the effect of pressure on the response of these sensors had little or no effect on potential, sensitivity, or limit of detection. High pressure sensor calibrations were performed in standard solutions as well as simulated seawater samples to demonstrate their usefulness as sensors in a deep-sea environment. These novel SC-ISE sensors show promise of providing the ability to make in situ real-time measurements of ion-fluxes near deep-ocean geothermal vents.
Publication Status
Published
Date Publish Online
2017-04-12