Potentiometric sensing array for monitoring aquatic systems

N Pankratova; G A Crespo; M G Afshar; M C Crespi; S Jeanneret; T Cherubini; M L Tercier-Waeber; F Pomati; Eric Bakker

doi:10.1039/c5em00038f

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Potentiometric sensing array for monitoring aquatic systems

Journal article

Open access

Peer reviewed

Potentiometric sensing array for monitoring aquatic systems

N Pankratova, G A Crespo, M G Afshar, M C Crespi, S Jeanneret, T Cherubini, M L Tercier-Waeber, F Pomati and Eric Bakker

Environmental Science Processes & Impacts, Vol.17(5), pp.906-914

2015

DOI: https://doi.org/10.1039/c5em00038f

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Abstract

Chemical Sciences

Environmental Sciences

Medical and Health Sciences

potentiometry

Since aquatic environments are highly heterogeneous and dynamic, there is the need in aquatic ecosystem monitoring to replace traditional approaches based on periodical sampling followed by laboratory analysis with new automated techniques that allow one to obtain monitoring data with high spatial and temporal resolution. We report here on a potentiometric sensing array based on polymeric membrane materials for the continuous monitoring of nutrients and chemical species relevant for the carbon cycle in freshwater ecosystems. The proposed setup operates autonomously, with measurement, calibration, fluidic control and acquisition triggers all integrated into a self-contained instrument. Experimental validation was performed on an automated monitoring platform on lake Greifensee (Switzerland) using potentiometric sensors selective for hydrogen ions, carbonate, calcium, nitrate and ammonium. Results from the field tests were compared with those obtained by traditional laboratory analysis. A linear correlation between calcium and nitrate activities measured with ISEs and relevant concentrations measured in the laboratory was found, with the slopes corresponding to apparent single ion activity coefficients and. Good correlation between pH values measured with ISE and CTD probes (SD = 0.2 pH) suggests adequate reliability of the methodology. This journal is © The Royal Society of Chemistry 2015.

Details

Title: Potentiometric sensing array for monitoring aquatic systems
Authors: N Pankratova (Author) - University of Geneva, Switzerland
G A Crespo (Author) - University of Geneva, Switzerland
M G Afshar (Author) - University of Geneva, Switzerland
M C Crespi (Author) - University of Geneva, Switzerland
S Jeanneret (Author) - University of Geneva, Switzerland
T Cherubini (Author) - University of Geneva, Switzerland
M L Tercier-Waeber (Author) - University of Geneva, Switzerland
F Pomati (Author) - Swiss Federal Institute of Aquatic Science and Technology, Switzerland
Eric Bakker (Author) - University of Geneva, Switzerland
Publication details: Environmental Science Processes & Impacts, Vol.17(5), pp.906-914
Publisher: Royal Society of Chemistry (R S C) Publications
Date published: 2015
DOI: 10.1039/c5em00038f
ISSN: 2050-7887
Organisation Unit: University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99449139302621
Output Type: Journal article

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Collaboration types: Domestic collaboration
Web Of Science research areas: Chemistry, Analytical; Environmental Sciences