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In Situ Detection of Macronutrients and Chloride in Seawater by Submersible Electrochemical Sensors Maria Cuartero, Gaston A. Crespo, Thomas Cherubini, Nadezda Pankratova, Fabio Confalonieri, Francesco Massa, Mary-Lou Tercier-Waeber, Melina Abdou, Joerg Schaefer, and Eric Bakker Anal. Chem., Just Accepted Manuscript • DOI: 10.1021/acs.analchem.7b05299 • Publication Date (Web): 08 Mar 2018 Downloaded from http://pubs.acs.org on March 8, 2018
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Analytical Chemistry
In Situ Detection of Macronutrients and Chloride in Seawater by Submersible Electrochemical Sensors Maria Cuarteroa,1,*, Gaston Crespoa,1, Thomas Cherubinia, Nadezda Pankratovaa, Fabio Confalonierib, Francesco Massac, Mary-Lou Tercier-Waebera, Melina Abdoud, Jörg Schäferd, Eric Bakkera,* a
Department of Inorganic and Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, CH-1211 Geneva, Switzerland. b Idronaut, Via Monte Amiata 10, I-20047 Brugherio (MI), Italy. c Department of Earth, Environment and Life Sciences, University of Genoa, C.so Europa 26, 16132 Genoa, Italy d Université de Bordeaux, UMR CNRS 5805 EPOC, Bat 18, Allée Geoffroy Saint-Hilaire, 33615 Pessac, France.
*E-mail:
[email protected]. Phone: +34669239019., *E-mail:
[email protected]. Phone: +41223796431.
1
Present address: School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, Teknikringen 30, SE-100 44, Stockholm, Sweden.
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ABSTRACT A new submersible probe for the in situ detection of nitrate, nitrite and chloride in seawater is presented. Inline coupling of a desalination unit, an acidification unit and a sensing flow cell containing all-solid-state membrane electrodes allows for the potentiometric detection of nitrate and nitrite after removal of the key interfering ions in seawater, chloride and hydroxide. Thus, the electrodes exhibited attractive analytical performances for the potentiometric detection of nitrate and nitrite in desalinated and acidified seawater: fast response time (t95
