Boron isotopes as pH proxy: A new look at ...
Type de document :
Article dans une revue scientifique
URL permanente :
Titre :
Boron isotopes as pH proxy: A new look at boron speciation in deep-sea corals using 11B MAS NMR and EELS
Auteur(s) :
Rollion-Bard, Claire [Auteur]
Centre de Recherches Pétrographiques et Géochimiques [CRPG]
Blamart, Dominique [Auteur]
Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]
Trebosc, Julien [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Tricot, Grégory [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Mussi, Alexandre [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Cuif, Jean-Pierre [Auteur]
Interactions et dynamique des environnements de surface [IDES]
Centre de Recherches Pétrographiques et Géochimiques [CRPG]
Blamart, Dominique [Auteur]
Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]
Trebosc, Julien [Auteur]
![refId](/themes/Mirage2//images/idref.png)
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Tricot, Grégory [Auteur]
![refId](/themes/Mirage2//images/idref.png)
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Mussi, Alexandre [Auteur]
![refId](/themes/Mirage2//images/idref.png)
Unité Matériaux et Transformations - UMR 8207 [UMET]
Cuif, Jean-Pierre [Auteur]
Interactions et dynamique des environnements de surface [IDES]
Titre de la revue :
Geochimica et Cosmochimica Acta
Numéro :
75
Pagination :
1003-1012
Date de publication :
2010-12-04
Discipline(s) HAL :
Planète et Univers [physics]/Sciences de la Terre
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Résumé en anglais : [en]
Dissolved boron in modern seawater occurs in the form of two species, trigonal boric acid B(OH)(3) and tetrahedral borate ion B(OH)(4)(-). One of the key assumption in the use of boron isotopic compositions of carbonates ...
Lire la suite >Dissolved boron in modern seawater occurs in the form of two species, trigonal boric acid B(OH)(3) and tetrahedral borate ion B(OH)(4)(-). One of the key assumption in the use of boron isotopic compositions of carbonates as pH proxy is that only borate ions, B(OH)(4)(-), are incorporated into the carbonate. Here, we investigate the speciation of boron in deep-sea coral microstructures (Lophelia pertusa specimen) by using high field magic angle spinning nuclear magnetic resonance (B-11 MAS NMR) and electron energy-loss spectroscopy (EELS). We observe both boron coordination species, but in different proportions depending on the coral microstructure, i.e. centres of calcification versus fibres. These results suggest that careful sampling is necessary before performing boron isotopic measurements in deep-sea corals. By combining the proportions of B(OH)(3) and B(OH)(4)(-) determined by NMR and our previous ion microprobe boron isotope measurements, we propose a new equation for the relation between seawater pH and boron isotopic composition in deep-sea corals. (C) 2010 Elsevier Ltd. All rights reserved.Lire moins >
Lire la suite >Dissolved boron in modern seawater occurs in the form of two species, trigonal boric acid B(OH)(3) and tetrahedral borate ion B(OH)(4)(-). One of the key assumption in the use of boron isotopic compositions of carbonates as pH proxy is that only borate ions, B(OH)(4)(-), are incorporated into the carbonate. Here, we investigate the speciation of boron in deep-sea coral microstructures (Lophelia pertusa specimen) by using high field magic angle spinning nuclear magnetic resonance (B-11 MAS NMR) and electron energy-loss spectroscopy (EELS). We observe both boron coordination species, but in different proportions depending on the coral microstructure, i.e. centres of calcification versus fibres. These results suggest that careful sampling is necessary before performing boron isotopic measurements in deep-sea corals. By combining the proportions of B(OH)(3) and B(OH)(4)(-) determined by NMR and our previous ion microprobe boron isotope measurements, we propose a new equation for the relation between seawater pH and boron isotopic composition in deep-sea corals. (C) 2010 Elsevier Ltd. All rights reserved.Lire moins >
Langue :
Anglais
Comité de lecture :
Oui
Audience :
Internationale
Vulgarisation :
Non
Établissement(s) :
Université de Lille
ENSCL
CNRS
INRA
ENSCL
CNRS
INRA
Collections :
Équipe(s) de recherche :
Plasticité
Date de dépôt :
2019-05-16T15:14:41Z
2021-06-24T13:43:52Z
2021-10-08T14:16:08Z
2021-06-24T13:43:52Z
2021-10-08T14:16:08Z