Copper-binding ligands in the NE Pacific
WOS:000443668500004 International audience Copper distribution and speciation were determined at stations P4 and P26 along Line P as part of a GEOTRACES Process Study in the Northeast Pacific, at depths between 10 and 1400 m. Two ligand classes (L-1 and L-2) were detected at both stations: the stron...
Published in: | Marine Chemistry |
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Main Authors: | , , , |
Other Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2018
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Online Access: | https://hal.science/hal-02651794 https://hal.science/hal-02651794/document https://hal.science/hal-02651794/file/Whitby_etal_MC_2018.pdf https://doi.org/10.1016/j.marchem.2018.05.008 |
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ftinsu:oai:HAL:hal-02651794v1 |
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Open Polar |
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Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
ACL marine-phytoplankton Seawater Glutathione Thiols sub-arctic pacific Copper speciation Thiourea humic substances complexing ligands dissolved organic-matter Cathodic stripping voltammetry estuarine waters methylosinus-trichosporium ob3b northeast pacific Organic ligands san-francisco bay [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
ACL marine-phytoplankton Seawater Glutathione Thiols sub-arctic pacific Copper speciation Thiourea humic substances complexing ligands dissolved organic-matter Cathodic stripping voltammetry estuarine waters methylosinus-trichosporium ob3b northeast pacific Organic ligands san-francisco bay [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Whitby, Hannah Posacka, Anna M. Maldonado, Maria T. Berg, Constant M. G., van Den Copper-binding ligands in the NE Pacific |
topic_facet |
ACL marine-phytoplankton Seawater Glutathione Thiols sub-arctic pacific Copper speciation Thiourea humic substances complexing ligands dissolved organic-matter Cathodic stripping voltammetry estuarine waters methylosinus-trichosporium ob3b northeast pacific Organic ligands san-francisco bay [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
WOS:000443668500004 International audience Copper distribution and speciation were determined at stations P4 and P26 along Line P as part of a GEOTRACES Process Study in the Northeast Pacific, at depths between 10 and 1400 m. Two ligand classes (L-1 and L-2) were detected at both stations: the stronger L-1 ligand pool with log K'(cu2+)(L1) 15.0-16.5 and the weaker L-2 ligand pool with log K'(cu2)(+L2) 11.6-13.6. The L-1 class bound on average 94% of dCu, with the ratio between L-1 and dCu constant and close to unity (1.15 = [L-1]:[dCu]). The concentrations of total ligands exceeded those of dCu at all depths, buffering Cu2+ concentrations ([Cu2+]) to femtomolar levels (i.e. pCu 14.1-15.7). Measurements using cathodic stripping voltammetry also identified natural copper-responsive peaks, which were attributed to thiourea- and glutathione-like thiols (TU and GSH, respectively), and Cu-binding humic substances (HScu). Concentrations of TU, GSH and HScu were determined by standard addition of model compounds in an attempt to identify Cu-binding ligands. HScu concentrations were generally higher at P26 than at P4, consistent with a marine origin of the humic material. Overall, HScu contributed to 1-27% of the total L concentration (L-T) and when combined with the two thiols contributed to up to 32% of L-T. This suggests other ligand types are responsible for the majority of dCu complexation in these waters, such as other thiols. Some potential candidates for detected, but unidentified, thiols are cysteine, 3-mercaptopropionic acid and 2-mercaptoethanol, all of which bind Cu. Significant correlation between the concentrations of TU-like thiols and L-1, along with the high log K'(cu)(2+)(L1) values, tentatively suggest that the electrochemical TU-type peak could be part of a larger, unidentified, high-affinity Cu compound, such as a methanobactin or porphyrin, with a stronger binding capability than typical thiols. This could imply that chalkophores may play a greater role in oceanic dCu complexation than ... |
author2 |
Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) University of British Columbia (UBC) University of Liverpool |
format |
Article in Journal/Newspaper |
author |
Whitby, Hannah Posacka, Anna M. Maldonado, Maria T. Berg, Constant M. G., van Den |
author_facet |
Whitby, Hannah Posacka, Anna M. Maldonado, Maria T. Berg, Constant M. G., van Den |
author_sort |
Whitby, Hannah |
title |
Copper-binding ligands in the NE Pacific |
title_short |
Copper-binding ligands in the NE Pacific |
title_full |
Copper-binding ligands in the NE Pacific |
title_fullStr |
Copper-binding ligands in the NE Pacific |
title_full_unstemmed |
Copper-binding ligands in the NE Pacific |
title_sort |
copper-binding ligands in the ne pacific |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.science/hal-02651794 https://hal.science/hal-02651794/document https://hal.science/hal-02651794/file/Whitby_etal_MC_2018.pdf https://doi.org/10.1016/j.marchem.2018.05.008 |
geographic |
Arctic Pacific |
geographic_facet |
Arctic Pacific |
genre |
Arctic Phytoplankton |
genre_facet |
Arctic Phytoplankton |
op_source |
ISSN: 0304-4203 Marine Chemistry https://hal.science/hal-02651794 Marine Chemistry, 2018, 204, pp.36-48. ⟨10.1016/j.marchem.2018.05.008⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.marchem.2018.05.008 hal-02651794 https://hal.science/hal-02651794 https://hal.science/hal-02651794/document https://hal.science/hal-02651794/file/Whitby_etal_MC_2018.pdf doi:10.1016/j.marchem.2018.05.008 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.marchem.2018.05.008 |
container_title |
Marine Chemistry |
container_volume |
204 |
container_start_page |
36 |
op_container_end_page |
48 |
_version_ |
1790597633353449472 |
spelling |
ftinsu:oai:HAL:hal-02651794v1 2024-02-11T10:01:50+01:00 Copper-binding ligands in the NE Pacific Whitby, Hannah Posacka, Anna M. Maldonado, Maria T. Berg, Constant M. G., van Den Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) University of British Columbia (UBC) University of Liverpool 2018 https://hal.science/hal-02651794 https://hal.science/hal-02651794/document https://hal.science/hal-02651794/file/Whitby_etal_MC_2018.pdf https://doi.org/10.1016/j.marchem.2018.05.008 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.marchem.2018.05.008 hal-02651794 https://hal.science/hal-02651794 https://hal.science/hal-02651794/document https://hal.science/hal-02651794/file/Whitby_etal_MC_2018.pdf doi:10.1016/j.marchem.2018.05.008 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0304-4203 Marine Chemistry https://hal.science/hal-02651794 Marine Chemistry, 2018, 204, pp.36-48. ⟨10.1016/j.marchem.2018.05.008⟩ ACL marine-phytoplankton Seawater Glutathione Thiols sub-arctic pacific Copper speciation Thiourea humic substances complexing ligands dissolved organic-matter Cathodic stripping voltammetry estuarine waters methylosinus-trichosporium ob3b northeast pacific Organic ligands san-francisco bay [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2018 ftinsu https://doi.org/10.1016/j.marchem.2018.05.008 2024-01-24T17:34:01Z WOS:000443668500004 International audience Copper distribution and speciation were determined at stations P4 and P26 along Line P as part of a GEOTRACES Process Study in the Northeast Pacific, at depths between 10 and 1400 m. Two ligand classes (L-1 and L-2) were detected at both stations: the stronger L-1 ligand pool with log K'(cu2+)(L1) 15.0-16.5 and the weaker L-2 ligand pool with log K'(cu2)(+L2) 11.6-13.6. The L-1 class bound on average 94% of dCu, with the ratio between L-1 and dCu constant and close to unity (1.15 = [L-1]:[dCu]). The concentrations of total ligands exceeded those of dCu at all depths, buffering Cu2+ concentrations ([Cu2+]) to femtomolar levels (i.e. pCu 14.1-15.7). Measurements using cathodic stripping voltammetry also identified natural copper-responsive peaks, which were attributed to thiourea- and glutathione-like thiols (TU and GSH, respectively), and Cu-binding humic substances (HScu). Concentrations of TU, GSH and HScu were determined by standard addition of model compounds in an attempt to identify Cu-binding ligands. HScu concentrations were generally higher at P26 than at P4, consistent with a marine origin of the humic material. Overall, HScu contributed to 1-27% of the total L concentration (L-T) and when combined with the two thiols contributed to up to 32% of L-T. This suggests other ligand types are responsible for the majority of dCu complexation in these waters, such as other thiols. Some potential candidates for detected, but unidentified, thiols are cysteine, 3-mercaptopropionic acid and 2-mercaptoethanol, all of which bind Cu. Significant correlation between the concentrations of TU-like thiols and L-1, along with the high log K'(cu)(2+)(L1) values, tentatively suggest that the electrochemical TU-type peak could be part of a larger, unidentified, high-affinity Cu compound, such as a methanobactin or porphyrin, with a stronger binding capability than typical thiols. This could imply that chalkophores may play a greater role in oceanic dCu complexation than ... Article in Journal/Newspaper Arctic Phytoplankton Institut national des sciences de l'Univers: HAL-INSU Arctic Pacific Marine Chemistry 204 36 48 |