| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Measurement of the isotopic composition of dissolved iron in the open ocean
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| Autores: |
Lacan, F.
Radic, A.
Jeandel, C.
Poitrasson, F.
Sarthou, Geraldine
Pradoux, C.
Freydier, R.
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| Data: |
2008-12
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| Ano: |
2008
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| Palavras-chave: |
MC ICP MS
Chelating resin
Southern ocean
Fractionation
Seawater
Earth
Separation
Accuracy
Pacific
FE(III)
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| Resumo: |
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.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
https://archimer.ifremer.fr/doc/00202/31374/29781.pdf
DOI:10.1029/2008GL035841
https://archimer.ifremer.fr/doc/00202/31374/
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| Editor: |
Amer Geophysical Union
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| Formato: |
application/pdf
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| Fonte: |
Geophysical Research Letters (0094-8276) (Amer Geophysical Union), 2008-12 , Vol. 35 , N. L24610 , P. 1-5
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| Direitos: |
Copyright 2008 by the American Geophysical Union.
info:eu-repo/semantics/openAccess
restricted use
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