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Silicate electrochemical measurements in seawater: chemical and analytical aspects towards a reagentless sensor

Comtat, Maurice and Garçon, Véronique and Lacombe, Marielle and Le Bris, Nadine and Thouron, Danièle Silicate electrochemical measurements in seawater: chemical and analytical aspects towards a reagentless sensor. (2008) Talanta, 77 (2). 744-750. ISSN 0039-9140

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Official URL: http://dx.doi.org/doi:10.1016/j.talanta.2008.07.023


From the study of molybdenum oxidation in aqueous solutions we developed a semi-autonomous method to detect silicate in aqueous samples. Molybdenum oxidation was used to form molybdate in acidic media. The silicomolybdic complex formed with silicate is detectable by amperometry or cyclic voltammetry. The new electrochemical method is in good agreement with the method conventionally used for environmental water silicate analysis. In the second stage, a completely reagentless method was developed using molybdate and proton produced during molybdenum oxidation. Reproducibility tests show a precision of 2.6% for a concentration of 100 μmol L−1. This new method will be very suitable for the development of new autonomous silicate sensors easy to handle and without reagents. In this paper we present the analytical and chemical aspects necessary for a complete documentation of the method before the development of a new reagentless sensor.

Item Type:Article
Additional Information:Act from 14th International Conference on Flow Injection Analysis and Related Techniques
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
French research institutions > Institut Français de Recherche pour l'Exploitation de la MER - IFREMER (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Laboratory name:
Deposited On:23 Jul 2009 13:17

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