Dissolved iron speciation and first characterization of organic ligands in the eastern Ross Sea
Iron (Fe) is the most important trace element in the ocean ecosystem, being a micronutrient required for phytoplankton growth and thus involved in marine primary productivity and carbon export. The dissolved Fe (dFe) is the most bioavailable fraction and about 99.9% of the dFe is complexed with orga...
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ftunivgenova:oai:iris.unige.it:11567/1144346 2024-04-14T08:00:53+00:00 Dissolved iron speciation and first characterization of organic ligands in the eastern Ross Sea Paola Rivaro Annalisa Salis Enrico Millo Davide Vivado Rivaro, Paola Salis, Annalisa Millo, Enrico Vivado, Davide 2023 ELETTRONICO https://hdl.handle.net/11567/1144346 eng eng ispartofbook:IV Ross Sea Conference 2023 IV Ross Sea Conference 2023 firstpage:49 lastpage:50 numberofpages:2 https://hdl.handle.net/11567/1144346 info:eu-repo/semantics/conferenceObject 2023 ftunivgenova 2024-03-21T02:19:42Z Iron (Fe) is the most important trace element in the ocean ecosystem, being a micronutrient required for phytoplankton growth and thus involved in marine primary productivity and carbon export. The dissolved Fe (dFe) is the most bioavailable fraction and about 99.9% of the dFe is complexed with organic ligands (L), the nature of which is largely unknown. The concentrations of L can be determined by the electrochemical technique of competitive ligand exchange-adsorptive cathodic stripping voltammetry (CLE-AdCSV), which also allow the binding affinity of Fe to be assessed through the values of the conditional stability constants (logK’Fe’L). However, CLE-AdCSV does not give details about the L nature. High performance liquid chromatography - electrospray ionization - mass spectrometry (HPLC-ESI-MS/MS) is a powerful new approach to characterize the Fe-binding ligands, thanks to the fragmentation patern of the MS/MS spectra. To date, the eastern sector is the most unexplored area of the Ross Sea, but its study has high scientific interest. In fact, it is the area where water masses from the western sector of Antarctica pass through and it is the gateway for the iron and organic ligands rich glacial meltwater coming from the nearby Amundsen Sea. In this work, the total concentration and speciation data of dFe determined in seawater samples collected during the austral summer of 2019-20 in the eastern Ross Sea (ESRS) and along the Ross Ice Shelf (RIS) in the framework of the ESTRO (Effect of the eaSTern inflow of water on the ROss Sea salinity field variability) project are presented. Principal component analysis (PCA) was used to explore correlations between dFe, speciation parameters, and the biogeochemistry of the area. This allowed us to assess the possible sources of dFe and L and to highlight the differences between the different water masses in this area. The subsurface samples were characterized by greater spatial dFe variability than the deep samples. Dissolved Fe average concentrations were higher in the ... Conference Object Amundsen Sea Antarc* Antarctica Ice Shelf Ross Ice Shelf Ross Sea Università degli Studi di Genova: CINECA IRIS Austral Ross Sea Amundsen Sea Ross Ice Shelf |
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Open Polar |
collection |
Università degli Studi di Genova: CINECA IRIS |
op_collection_id |
ftunivgenova |
language |
English |
description |
Iron (Fe) is the most important trace element in the ocean ecosystem, being a micronutrient required for phytoplankton growth and thus involved in marine primary productivity and carbon export. The dissolved Fe (dFe) is the most bioavailable fraction and about 99.9% of the dFe is complexed with organic ligands (L), the nature of which is largely unknown. The concentrations of L can be determined by the electrochemical technique of competitive ligand exchange-adsorptive cathodic stripping voltammetry (CLE-AdCSV), which also allow the binding affinity of Fe to be assessed through the values of the conditional stability constants (logK’Fe’L). However, CLE-AdCSV does not give details about the L nature. High performance liquid chromatography - electrospray ionization - mass spectrometry (HPLC-ESI-MS/MS) is a powerful new approach to characterize the Fe-binding ligands, thanks to the fragmentation patern of the MS/MS spectra. To date, the eastern sector is the most unexplored area of the Ross Sea, but its study has high scientific interest. In fact, it is the area where water masses from the western sector of Antarctica pass through and it is the gateway for the iron and organic ligands rich glacial meltwater coming from the nearby Amundsen Sea. In this work, the total concentration and speciation data of dFe determined in seawater samples collected during the austral summer of 2019-20 in the eastern Ross Sea (ESRS) and along the Ross Ice Shelf (RIS) in the framework of the ESTRO (Effect of the eaSTern inflow of water on the ROss Sea salinity field variability) project are presented. Principal component analysis (PCA) was used to explore correlations between dFe, speciation parameters, and the biogeochemistry of the area. This allowed us to assess the possible sources of dFe and L and to highlight the differences between the different water masses in this area. The subsurface samples were characterized by greater spatial dFe variability than the deep samples. Dissolved Fe average concentrations were higher in the ... |
author2 |
Rivaro, Paola Salis, Annalisa Millo, Enrico Vivado, Davide |
format |
Conference Object |
author |
Paola Rivaro Annalisa Salis Enrico Millo Davide Vivado |
spellingShingle |
Paola Rivaro Annalisa Salis Enrico Millo Davide Vivado Dissolved iron speciation and first characterization of organic ligands in the eastern Ross Sea |
author_facet |
Paola Rivaro Annalisa Salis Enrico Millo Davide Vivado |
author_sort |
Paola Rivaro |
title |
Dissolved iron speciation and first characterization of organic ligands in the eastern Ross Sea |
title_short |
Dissolved iron speciation and first characterization of organic ligands in the eastern Ross Sea |
title_full |
Dissolved iron speciation and first characterization of organic ligands in the eastern Ross Sea |
title_fullStr |
Dissolved iron speciation and first characterization of organic ligands in the eastern Ross Sea |
title_full_unstemmed |
Dissolved iron speciation and first characterization of organic ligands in the eastern Ross Sea |
title_sort |
dissolved iron speciation and first characterization of organic ligands in the eastern ross sea |
publishDate |
2023 |
url |
https://hdl.handle.net/11567/1144346 |
geographic |
Austral Ross Sea Amundsen Sea Ross Ice Shelf |
geographic_facet |
Austral Ross Sea Amundsen Sea Ross Ice Shelf |
genre |
Amundsen Sea Antarc* Antarctica Ice Shelf Ross Ice Shelf Ross Sea |
genre_facet |
Amundsen Sea Antarc* Antarctica Ice Shelf Ross Ice Shelf Ross Sea |
op_relation |
ispartofbook:IV Ross Sea Conference 2023 IV Ross Sea Conference 2023 firstpage:49 lastpage:50 numberofpages:2 https://hdl.handle.net/11567/1144346 |
_version_ |
1796304278541828096 |