Silicate determination in sea water: toward a reagentless electrochemical method
ilicate has been determined in sea water by four different electrochemical methods based on the detection of the silicomolybdic complex formed in acidic media by the reaction between silicate and molybdenum salts. The first two methods are based on the addition of molybdate and protons in a seawater...
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Online Access: | http://oatao.univ-toulouse.fr/3079/ http://oatao.univ-toulouse.fr/3079/1/Comtat_3079.pdf https://doi.org/10.1016/j.marchem.2007.05.002 |
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ftunivtoulouseoa:oai:oatao.univ-toulouse.fr:3079 2023-05-15T16:02:29+02:00 Silicate determination in sea water: toward a reagentless electrochemical method Comtat, Maurice Garçon, Véronique Lacombe, Marielle Le Bris, Nadine Oriol, Louise Provost, Christine Thouron, Danièle Sudre, Joel Centre National de la Recherche Scientifique - CNRS (FRANCE) Institut Français de Recherche pour l'Exploitation de la MER - IFREMER (FRANCE) Institut National Polytechnique de Toulouse - INPT (FRANCE) Université Toulouse III - Paul Sabatier - UPS (FRANCE) 2007-08 application/pdf http://oatao.univ-toulouse.fr/3079/ http://oatao.univ-toulouse.fr/3079/1/Comtat_3079.pdf https://doi.org/10.1016/j.marchem.2007.05.002 en eng Elsevier http://oatao.univ-toulouse.fr/3079/1/Comtat_3079.pdf Comtat, Maurice and Garçon, Véronique and Lacombe, Marielle and Le Bris, Nadine and Oriol, Louise and Provost, Christine and Thouron, Danièle and Sudre, Joel. Silicate determination in sea water: toward a reagentless electrochemical method. (2007) Marine Chemistry, 106 (3-4). 489-497 . ISSN 0304-4203 info:eu-repo/semantics/openAccess Génie des procédés Génie chimique Silicate Chronoamperometry Voltammetry Molybdenum Reagentless method Drake Passage Article PeerReviewed info:eu-repo/semantics/article 2007 ftunivtoulouseoa https://doi.org/10.1016/j.marchem.2007.05.002 2019-08-29T11:16:28Z ilicate has been determined in sea water by four different electrochemical methods based on the detection of the silicomolybdic complex formed in acidic media by the reaction between silicate and molybdenum salts. The first two methods are based on the addition of molybdate and protons in a seawater sample in an electrochemical cell. Cyclic voltammetry presents two reduction and two oxidation peaks giving four values of the concentration and therefore increasing the precision. Then chronoamperometry is performed on an electrode held at a constant potential. A semi-autonomous method has been developed based on the electrochemical anodic oxidation of molybdenum, the complexation of the oxidation product with silicate and the detection of the complex by cyclic voltammetry. This method is tested and compared with the classical colorimetric one during ANT XXIII/3 cruise across Drake Passage (January–February 2006). The detection limit is 1 μM and the deviation between both methods is less than 3% for concentrations higher than 10 μM. Finally a complete reagentless method with a precision of 2.6% is described based on the simultaneous formation of the molybdenum salt and protons in a divided electrochemical cell. This latter method should be very useful for developing a reagentless sensor suitable for long term in situ deployments on oceanic biogeochemical observatories. Article in Journal/Newspaper Drake Passage OATAO (Open Archive Toulouse Archive Ouverte - Université de Toulouse) Drake Passage Marine Chemistry 106 3-4 489 497 |
institution |
Open Polar |
collection |
OATAO (Open Archive Toulouse Archive Ouverte - Université de Toulouse) |
op_collection_id |
ftunivtoulouseoa |
language |
English |
topic |
Génie des procédés Génie chimique Silicate Chronoamperometry Voltammetry Molybdenum Reagentless method Drake Passage |
spellingShingle |
Génie des procédés Génie chimique Silicate Chronoamperometry Voltammetry Molybdenum Reagentless method Drake Passage Comtat, Maurice Garçon, Véronique Lacombe, Marielle Le Bris, Nadine Oriol, Louise Provost, Christine Thouron, Danièle Sudre, Joel Silicate determination in sea water: toward a reagentless electrochemical method |
topic_facet |
Génie des procédés Génie chimique Silicate Chronoamperometry Voltammetry Molybdenum Reagentless method Drake Passage |
description |
ilicate has been determined in sea water by four different electrochemical methods based on the detection of the silicomolybdic complex formed in acidic media by the reaction between silicate and molybdenum salts. The first two methods are based on the addition of molybdate and protons in a seawater sample in an electrochemical cell. Cyclic voltammetry presents two reduction and two oxidation peaks giving four values of the concentration and therefore increasing the precision. Then chronoamperometry is performed on an electrode held at a constant potential. A semi-autonomous method has been developed based on the electrochemical anodic oxidation of molybdenum, the complexation of the oxidation product with silicate and the detection of the complex by cyclic voltammetry. This method is tested and compared with the classical colorimetric one during ANT XXIII/3 cruise across Drake Passage (January–February 2006). The detection limit is 1 μM and the deviation between both methods is less than 3% for concentrations higher than 10 μM. Finally a complete reagentless method with a precision of 2.6% is described based on the simultaneous formation of the molybdenum salt and protons in a divided electrochemical cell. This latter method should be very useful for developing a reagentless sensor suitable for long term in situ deployments on oceanic biogeochemical observatories. |
author2 |
Centre National de la Recherche Scientifique - CNRS (FRANCE) Institut Français de Recherche pour l'Exploitation de la MER - IFREMER (FRANCE) Institut National Polytechnique de Toulouse - INPT (FRANCE) Université Toulouse III - Paul Sabatier - UPS (FRANCE) |
format |
Article in Journal/Newspaper |
author |
Comtat, Maurice Garçon, Véronique Lacombe, Marielle Le Bris, Nadine Oriol, Louise Provost, Christine Thouron, Danièle Sudre, Joel |
author_facet |
Comtat, Maurice Garçon, Véronique Lacombe, Marielle Le Bris, Nadine Oriol, Louise Provost, Christine Thouron, Danièle Sudre, Joel |
author_sort |
Comtat, Maurice |
title |
Silicate determination in sea water: toward a reagentless electrochemical method |
title_short |
Silicate determination in sea water: toward a reagentless electrochemical method |
title_full |
Silicate determination in sea water: toward a reagentless electrochemical method |
title_fullStr |
Silicate determination in sea water: toward a reagentless electrochemical method |
title_full_unstemmed |
Silicate determination in sea water: toward a reagentless electrochemical method |
title_sort |
silicate determination in sea water: toward a reagentless electrochemical method |
publisher |
Elsevier |
publishDate |
2007 |
url |
http://oatao.univ-toulouse.fr/3079/ http://oatao.univ-toulouse.fr/3079/1/Comtat_3079.pdf https://doi.org/10.1016/j.marchem.2007.05.002 |
geographic |
Drake Passage |
geographic_facet |
Drake Passage |
genre |
Drake Passage |
genre_facet |
Drake Passage |
op_relation |
http://oatao.univ-toulouse.fr/3079/1/Comtat_3079.pdf Comtat, Maurice and Garçon, Véronique and Lacombe, Marielle and Le Bris, Nadine and Oriol, Louise and Provost, Christine and Thouron, Danièle and Sudre, Joel. Silicate determination in sea water: toward a reagentless electrochemical method. (2007) Marine Chemistry, 106 (3-4). 489-497 . ISSN 0304-4203 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.marchem.2007.05.002 |
container_title |
Marine Chemistry |
container_volume |
106 |
container_issue |
3-4 |
container_start_page |
489 |
op_container_end_page |
497 |
_version_ |
1766398145959297024 |