Characterisation and deployment of an immobilised pH sensor spot towards surface ocean pH measurements
International audience The oceans are a major sink for anthropogenic atmospheric carbon dioxide, and the uptake causes changes to the marine carbonate system and has wide ranging effects on flora and fauna. It is crucial to develop analytical systems that allow us to follow the increase in oceanic p...
Published in: | Analytica Chimica Acta |
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Main Authors: | , , , , , |
Other Authors: | , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2015
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Subjects: | |
Online Access: | https://hal.sorbonne-universite.fr/hal-01225001 https://hal.sorbonne-universite.fr/hal-01225001/document https://hal.sorbonne-universite.fr/hal-01225001/file/Clarke_2015_Characterisation.pdf https://doi.org/10.1016/j.aca.2015.09.026 |
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English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] Clarke, Jennifer S. Achterberg, Eric P. Rérolle, Victoire Abi Kaed Bey, Samer Floquet, Cedric F.A. Mowlem, Matthew C. Characterisation and deployment of an immobilised pH sensor spot towards surface ocean pH measurements |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
description |
International audience The oceans are a major sink for anthropogenic atmospheric carbon dioxide, and the uptake causes changes to the marine carbonate system and has wide ranging effects on flora and fauna. It is crucial to develop analytical systems that allow us to follow the increase in oceanic pCO 2 and corresponding reduction in pH. Miniaturised sensor systems using immobilised fluorescence indicator spots are attractive for this purpose because of their simple design and low power requirements. The technology is increasingly used for oceanic dissolved oxygen measurements. We present a detailed method on the use of immobilised fluorescence indicator spots to determine pH in ocean waters across the pH range 7.6–8.2. We characterised temperature (−0.046 pH/°C from 5 to 25 °C) and salinity dependences (−0.01 pH/psu over 5–35), and performed a preliminary investigation into the influence of chlorophyll on the pH measurement. The apparent pKa of the sensor spots was 6.93 at 20 °C. A drift of 0.00014 R (ca. 0.0004 pH, at 25 °C, salinity 35) was observed over a 3 day period in a laboratory based drift experiment. We achieved a precision of 0.0074 pH units, and observed a drift of 0.06 pH units during a test deployment of 5 week duration in the Southern Ocean as an underway surface ocean sensor, which was corrected for using certified reference materials. The temperature and salinity dependences were accounted for with the algorithm, R=0.00034−0.17·pH+0.15·S2+0.0067·T−0.0084·S·1.075R=0.00034−0.17·pH+0.15·S2+0.0067·T−0.0084·S·1.075. This study provides a first step towards a pH optode system suitable for autonomous deployment. The use of a short duration low power illumination (LED current 0.2 mA, 5 μs illumination time) improved the lifetime and precision of the spot. Further improvements to the pH indicator spot operations include regular application of certified reference materials for drift correction and cross-calibration against a spectrophotometric pH system. Desirable future developments should involve ... |
author2 |
National Oceanography Centre Southampton (NOC) University of Southampton Helmholtz Centre for Ocean Research Kiel (GEOMAR) Austral, Boréal et Carbone (ABC) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) American University of Science and Technology (AUST) |
format |
Article in Journal/Newspaper |
author |
Clarke, Jennifer S. Achterberg, Eric P. Rérolle, Victoire Abi Kaed Bey, Samer Floquet, Cedric F.A. Mowlem, Matthew C. |
author_facet |
Clarke, Jennifer S. Achterberg, Eric P. Rérolle, Victoire Abi Kaed Bey, Samer Floquet, Cedric F.A. Mowlem, Matthew C. |
author_sort |
Clarke, Jennifer S. |
title |
Characterisation and deployment of an immobilised pH sensor spot towards surface ocean pH measurements |
title_short |
Characterisation and deployment of an immobilised pH sensor spot towards surface ocean pH measurements |
title_full |
Characterisation and deployment of an immobilised pH sensor spot towards surface ocean pH measurements |
title_fullStr |
Characterisation and deployment of an immobilised pH sensor spot towards surface ocean pH measurements |
title_full_unstemmed |
Characterisation and deployment of an immobilised pH sensor spot towards surface ocean pH measurements |
title_sort |
characterisation and deployment of an immobilised ph sensor spot towards surface ocean ph measurements |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal.sorbonne-universite.fr/hal-01225001 https://hal.sorbonne-universite.fr/hal-01225001/document https://hal.sorbonne-universite.fr/hal-01225001/file/Clarke_2015_Characterisation.pdf https://doi.org/10.1016/j.aca.2015.09.026 |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 0003-2670 Analytica Chimica Acta https://hal.sorbonne-universite.fr/hal-01225001 Analytica Chimica Acta, 2015, 897, pp.69-80. ⟨10.1016/j.aca.2015.09.026⟩ |
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info:eu-repo/semantics/altIdentifier/doi/10.1016/j.aca.2015.09.026 hal-01225001 https://hal.sorbonne-universite.fr/hal-01225001 https://hal.sorbonne-universite.fr/hal-01225001/document https://hal.sorbonne-universite.fr/hal-01225001/file/Clarke_2015_Characterisation.pdf doi:10.1016/j.aca.2015.09.026 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.aca.2015.09.026 |
container_title |
Analytica Chimica Acta |
container_volume |
897 |
container_start_page |
69 |
op_container_end_page |
80 |
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1810481782644015104 |
spelling |
ftsorbonneuniv:oai:HAL:hal-01225001v1 2024-09-15T18:37:25+00:00 Characterisation and deployment of an immobilised pH sensor spot towards surface ocean pH measurements Clarke, Jennifer S. Achterberg, Eric P. Rérolle, Victoire Abi Kaed Bey, Samer Floquet, Cedric F.A. Mowlem, Matthew C. National Oceanography Centre Southampton (NOC) University of Southampton Helmholtz Centre for Ocean Research Kiel (GEOMAR) Austral, Boréal et Carbone (ABC) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) American University of Science and Technology (AUST) 2015-10 https://hal.sorbonne-universite.fr/hal-01225001 https://hal.sorbonne-universite.fr/hal-01225001/document https://hal.sorbonne-universite.fr/hal-01225001/file/Clarke_2015_Characterisation.pdf https://doi.org/10.1016/j.aca.2015.09.026 en eng HAL CCSD Elsevier Masson info:eu-repo/semantics/altIdentifier/doi/10.1016/j.aca.2015.09.026 hal-01225001 https://hal.sorbonne-universite.fr/hal-01225001 https://hal.sorbonne-universite.fr/hal-01225001/document https://hal.sorbonne-universite.fr/hal-01225001/file/Clarke_2015_Characterisation.pdf doi:10.1016/j.aca.2015.09.026 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0003-2670 Analytica Chimica Acta https://hal.sorbonne-universite.fr/hal-01225001 Analytica Chimica Acta, 2015, 897, pp.69-80. ⟨10.1016/j.aca.2015.09.026⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2015 ftsorbonneuniv https://doi.org/10.1016/j.aca.2015.09.026 2024-08-01T23:46:54Z International audience The oceans are a major sink for anthropogenic atmospheric carbon dioxide, and the uptake causes changes to the marine carbonate system and has wide ranging effects on flora and fauna. It is crucial to develop analytical systems that allow us to follow the increase in oceanic pCO 2 and corresponding reduction in pH. Miniaturised sensor systems using immobilised fluorescence indicator spots are attractive for this purpose because of their simple design and low power requirements. The technology is increasingly used for oceanic dissolved oxygen measurements. We present a detailed method on the use of immobilised fluorescence indicator spots to determine pH in ocean waters across the pH range 7.6–8.2. We characterised temperature (−0.046 pH/°C from 5 to 25 °C) and salinity dependences (−0.01 pH/psu over 5–35), and performed a preliminary investigation into the influence of chlorophyll on the pH measurement. The apparent pKa of the sensor spots was 6.93 at 20 °C. A drift of 0.00014 R (ca. 0.0004 pH, at 25 °C, salinity 35) was observed over a 3 day period in a laboratory based drift experiment. We achieved a precision of 0.0074 pH units, and observed a drift of 0.06 pH units during a test deployment of 5 week duration in the Southern Ocean as an underway surface ocean sensor, which was corrected for using certified reference materials. The temperature and salinity dependences were accounted for with the algorithm, R=0.00034−0.17·pH+0.15·S2+0.0067·T−0.0084·S·1.075R=0.00034−0.17·pH+0.15·S2+0.0067·T−0.0084·S·1.075. This study provides a first step towards a pH optode system suitable for autonomous deployment. The use of a short duration low power illumination (LED current 0.2 mA, 5 μs illumination time) improved the lifetime and precision of the spot. Further improvements to the pH indicator spot operations include regular application of certified reference materials for drift correction and cross-calibration against a spectrophotometric pH system. Desirable future developments should involve ... Article in Journal/Newspaper Southern Ocean HAL Sorbonne Université Analytica Chimica Acta 897 69 80 |