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Environmental Measurements Methods 2
Fast Potentiometric CO Sensor for High-resolution In situ Measurements in Fresh Water Systems Rohini Athavale, Nadezda Pankratova, Christian Dinkel, Eric Bakker, Bernhard Wehrli, and Andreas Brand Environ. Sci. Technol., Just Accepted Manuscript • DOI: 10.1021/acs.est.8b02969 • Publication Date (Web): 03 Sep 2018 Downloaded from http://pubs.acs.org on September 4, 2018
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Environmental Science & Technology
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Fast Potentiometric CO2 Sensor for High-resolution In situ
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Measurements in Fresh Water Systems
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Rohini Athavale1, 2‡*, Nadezda Pankratova3, 4‡, Christian Dinkel1, Eric Bakker3, Bernhard Wehrli1, 2,
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Andreas Brand1, 2
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and Management, Seestrasse 79, CH-6047 Kastanienbaum, Switzerland.
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Eawag – Swiss Federal Institute of Aquatic Science and Technology, Department of Surface Waters Research
Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, Universitätsstrasse 16, CH-8092 Zürich,
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Switzerland.
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3Department
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Switzerland.
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Lausanne, Switzerland.
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‡
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*Corresponding Author
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E-mail:
[email protected] 18
Phone Number: +41 587655633
of Inorganic and Analytical Chemistry, University of Geneva, Quai E.-Ansermet 30, 1211 Geneva,
Integrated Systems Laboratory (LSI), Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015
Both authors contributed equally
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ABSTRACT
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We present a new potentiometric sensor principle and a calibration protocol for in situ
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profiling of dissolved CO2 with high temporal and spatial resolution in fresh water lakes. The
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sensor system is based on the measurement of EMF between two solid contact ion selective
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electrodes (SC-ISEs), a hydrogen ion selective and a carbonate selective sensor. Since it relies ACS Paragon Plus Environment
Environmental Science & Technology
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on SC-ISEs, it is insensitive to changes in the pressure, thus suitable for in situ studies. Also,
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as it offers a response time (t95%) of
