Ultrasensitive Seawater pH Measurement by Capacitive Readout of Potentiometric Sensors
Potentiometric pH probes remain the gold standard for the detection of pH but are not sufficiently sensitive to reliably detect ocean acidification at adequate frequency. Here, potentiometric probes are made dramatically more sensitive by placing a capacitive electronic component in series to the pH...
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ftunivgeneve:oai:unige.ch:unige:141065 2023-05-15T17:50:02+02:00 Ultrasensitive Seawater pH Measurement by Capacitive Readout of Potentiometric Sensors Kraikaew, Pitchnaree Jeanneret Grosjean, Stéphane Soda, Yoshiki Cherubini, Thomas John Bakker, Eric 2020 https://archive-ouverte.unige.ch/unige:141065 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1021/acssensors.0c00031 unige:141065 https://archive-ouverte.unige.ch/unige:141065 info:eu-repo/semantics/openAccess ISSN: 2379-3694 ACS Sensors, Vol. 5, No 3 (2020) pp. 650-654 info:eu-repo/classification/ddc/540 Capacitive readout Small pH change Seawater Ocean acidification PH electrode Ionophore Text info:eu-repo/semantics/article Article scientifique info:eu-repo/semantics/publishedVersion 2020 ftunivgeneve https://doi.org/10.1021/acssensors.0c00031 2022-02-08T22:30:33Z Potentiometric pH probes remain the gold standard for the detection of pH but are not sufficiently sensitive to reliably detect ocean acidification at adequate frequency. Here, potentiometric probes are made dramatically more sensitive by placing a capacitive electronic component in series to the pH probe while imposing a constant potential over the measurement circuit. Each sample change now triggers a capacitive current transient that is easily identified between the two equilibrium states, and is integrated to reveal the accumulated charge. This affords dramatically higher precision than with traditional potentiometric probes. pH changes down to 0.001 pH units are easily distinguished in buffer and seawater samples, at a precision (standard deviation) of 28 μpH and 67 μpH, respectively, orders of magnitude better than what is possible with potentiometric pH probes. Article in Journal/Newspaper Ocean acidification Université de Genève: Archive ouverte UNIGE ACS Sensors 5 3 650 654 |
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Open Polar |
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Université de Genève: Archive ouverte UNIGE |
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ftunivgeneve |
language |
English |
topic |
info:eu-repo/classification/ddc/540 Capacitive readout Small pH change Seawater Ocean acidification PH electrode Ionophore |
spellingShingle |
info:eu-repo/classification/ddc/540 Capacitive readout Small pH change Seawater Ocean acidification PH electrode Ionophore Kraikaew, Pitchnaree Jeanneret Grosjean, Stéphane Soda, Yoshiki Cherubini, Thomas John Bakker, Eric Ultrasensitive Seawater pH Measurement by Capacitive Readout of Potentiometric Sensors |
topic_facet |
info:eu-repo/classification/ddc/540 Capacitive readout Small pH change Seawater Ocean acidification PH electrode Ionophore |
description |
Potentiometric pH probes remain the gold standard for the detection of pH but are not sufficiently sensitive to reliably detect ocean acidification at adequate frequency. Here, potentiometric probes are made dramatically more sensitive by placing a capacitive electronic component in series to the pH probe while imposing a constant potential over the measurement circuit. Each sample change now triggers a capacitive current transient that is easily identified between the two equilibrium states, and is integrated to reveal the accumulated charge. This affords dramatically higher precision than with traditional potentiometric probes. pH changes down to 0.001 pH units are easily distinguished in buffer and seawater samples, at a precision (standard deviation) of 28 μpH and 67 μpH, respectively, orders of magnitude better than what is possible with potentiometric pH probes. |
format |
Article in Journal/Newspaper |
author |
Kraikaew, Pitchnaree Jeanneret Grosjean, Stéphane Soda, Yoshiki Cherubini, Thomas John Bakker, Eric |
author_facet |
Kraikaew, Pitchnaree Jeanneret Grosjean, Stéphane Soda, Yoshiki Cherubini, Thomas John Bakker, Eric |
author_sort |
Kraikaew, Pitchnaree |
title |
Ultrasensitive Seawater pH Measurement by Capacitive Readout of Potentiometric Sensors |
title_short |
Ultrasensitive Seawater pH Measurement by Capacitive Readout of Potentiometric Sensors |
title_full |
Ultrasensitive Seawater pH Measurement by Capacitive Readout of Potentiometric Sensors |
title_fullStr |
Ultrasensitive Seawater pH Measurement by Capacitive Readout of Potentiometric Sensors |
title_full_unstemmed |
Ultrasensitive Seawater pH Measurement by Capacitive Readout of Potentiometric Sensors |
title_sort |
ultrasensitive seawater ph measurement by capacitive readout of potentiometric sensors |
publishDate |
2020 |
url |
https://archive-ouverte.unige.ch/unige:141065 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
ISSN: 2379-3694 ACS Sensors, Vol. 5, No 3 (2020) pp. 650-654 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1021/acssensors.0c00031 unige:141065 https://archive-ouverte.unige.ch/unige:141065 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1021/acssensors.0c00031 |
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ACS Sensors |
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5 |
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3 |
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650 |
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654 |
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1766156613417172992 |