Measurement of the isotopic composition of dissolved iron in the open ocean

This work demonstrates for the first time the feasibility of the measurement of the isotopic composition of dissolved iron in seawater for a typical open ocean Fe concentration range (0.1-1 nM). It also presents the first data of this kind. Iron is preconcentrated using a Nitriloacetic Acid Superflo...

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Published in:Geophysical Research Letters
Main Authors: Lacan, F., Radic, A., Jeandel, C., Poitrasson, F., Sarthou, Geraldine, Pradoux, C., Freydier, R.
Format: Text
Language:English
Published: Amer Geophysical Union 2008
Subjects:
geo
Online Access:https://doi.org/10.1029/2008GL035841
https://archimer.ifremer.fr/doc/00202/31374/29781.pdf
https://archimer.ifremer.fr/doc/00202/31374/
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spelling fttriple:oai:gotriple.eu:10670/1.3yldz5 2023-05-15T18:25:28+02:00 Measurement of the isotopic composition of dissolved iron in the open ocean Lacan, F. Radic, A. Jeandel, C. Poitrasson, F. Sarthou, Geraldine Pradoux, C. Freydier, R. 2008-01-01 https://doi.org/10.1029/2008GL035841 https://archimer.ifremer.fr/doc/00202/31374/29781.pdf https://archimer.ifremer.fr/doc/00202/31374/ en eng Amer Geophysical Union doi:10.1029/2008GL035841 10670/1.3yldz5 https://archimer.ifremer.fr/doc/00202/31374/29781.pdf https://archimer.ifremer.fr/doc/00202/31374/ other Archimer, archive institutionnelle de l'Ifremer Geophysical Research Letters (0094-8276) (Amer Geophysical Union), 2008-12 , Vol. 35 , N. L24610 , P. 1-5 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2008 fttriple https://doi.org/10.1029/2008GL035841 2023-01-22T17:35:49Z This work demonstrates for the first time the feasibility of the measurement of the isotopic composition of dissolved iron in seawater for a typical open ocean Fe concentration range (0.1-1 nM). It also presents the first data of this kind. Iron is preconcentrated using a Nitriloacetic Acid Superflow resin and purified using an AG1x4 anion exchange resin. The isotopic ratios are measured with a MC-ICPMS Neptune, coupled with a desolvator (Aridus II), using a Fe-57-Fe-58 double spike mass bias correction. Measurement precision (0.13%, 2SD) allows resolving small iron isotopic composition variations within the water column, in the Atlantic sector of the Southern Ocean (from delta Fe-57 = -0.19 to +0.32 parts per thousand). Isotopically light iron found in the Upper Circumpolar Deep Water is hypothesized to result from organic matter remineralization. Shallow samples suggest that, if occurring, an iron isotopic fractionation during iron uptake by phytoplankton is characterized by a fractionation factor, such as: vertical bar Delta Fe-57((plankton-seawater))vertical bar < 0.48 parts per thousand. Text Southern Ocean Unknown Southern Ocean Geophysical Research Letters 35 24
institution Open Polar
collection Unknown
op_collection_id fttriple
language English
topic envir
geo
spellingShingle envir
geo
Lacan, F.
Radic, A.
Jeandel, C.
Poitrasson, F.
Sarthou, Geraldine
Pradoux, C.
Freydier, R.
Measurement of the isotopic composition of dissolved iron in the open ocean
topic_facet envir
geo
description This work demonstrates for the first time the feasibility of the measurement of the isotopic composition of dissolved iron in seawater for a typical open ocean Fe concentration range (0.1-1 nM). It also presents the first data of this kind. Iron is preconcentrated using a Nitriloacetic Acid Superflow resin and purified using an AG1x4 anion exchange resin. The isotopic ratios are measured with a MC-ICPMS Neptune, coupled with a desolvator (Aridus II), using a Fe-57-Fe-58 double spike mass bias correction. Measurement precision (0.13%, 2SD) allows resolving small iron isotopic composition variations within the water column, in the Atlantic sector of the Southern Ocean (from delta Fe-57 = -0.19 to +0.32 parts per thousand). Isotopically light iron found in the Upper Circumpolar Deep Water is hypothesized to result from organic matter remineralization. Shallow samples suggest that, if occurring, an iron isotopic fractionation during iron uptake by phytoplankton is characterized by a fractionation factor, such as: vertical bar Delta Fe-57((plankton-seawater))vertical bar < 0.48 parts per thousand.
format Text
author Lacan, F.
Radic, A.
Jeandel, C.
Poitrasson, F.
Sarthou, Geraldine
Pradoux, C.
Freydier, R.
author_facet Lacan, F.
Radic, A.
Jeandel, C.
Poitrasson, F.
Sarthou, Geraldine
Pradoux, C.
Freydier, R.
author_sort Lacan, F.
title Measurement of the isotopic composition of dissolved iron in the open ocean
title_short Measurement of the isotopic composition of dissolved iron in the open ocean
title_full Measurement of the isotopic composition of dissolved iron in the open ocean
title_fullStr Measurement of the isotopic composition of dissolved iron in the open ocean
title_full_unstemmed Measurement of the isotopic composition of dissolved iron in the open ocean
title_sort measurement of the isotopic composition of dissolved iron in the open ocean
publisher Amer Geophysical Union
publishDate 2008
url https://doi.org/10.1029/2008GL035841
https://archimer.ifremer.fr/doc/00202/31374/29781.pdf
https://archimer.ifremer.fr/doc/00202/31374/
geographic Southern Ocean
geographic_facet Southern Ocean
genre Southern Ocean
genre_facet Southern Ocean
op_source Archimer, archive institutionnelle de l'Ifremer
Geophysical Research Letters (0094-8276) (Amer Geophysical Union), 2008-12 , Vol. 35 , N. L24610 , P. 1-5
op_relation doi:10.1029/2008GL035841
10670/1.3yldz5
https://archimer.ifremer.fr/doc/00202/31374/29781.pdf
https://archimer.ifremer.fr/doc/00202/31374/
op_rights other
op_doi https://doi.org/10.1029/2008GL035841
container_title Geophysical Research Letters
container_volume 35
container_issue 24
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