High precision osmium elemental and isotope measurements of North Atlantic seawater
International audience This study presents new Os isotope and elemental data of seawater from the North Atlantic Ocean. Two techniques have been optimised and used to achieve tracer–seawater equilibration: (i) heating of a seawater–tracer mixture at 100 °C with Br2, CrO3 and H2SO4 in Teflon bombs an...
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ftunivnantes:oai:HAL:hal-01134921v1 2023-05-15T17:32:08+02:00 High precision osmium elemental and isotope measurements of North Atlantic seawater Gannoun, Abdelmouhcine Burton, Kevin W. Laboratoire Magmas et Volcans (LMV) Observatoire de Physique du Globe de Clermont-Ferrand (OPGC) Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS) Department of Earth Sciences Durham Durham University 2014 https://hal.science/hal-01134921 https://doi.org/10.1039/C4JA00265B en eng HAL CCSD Royal Society of Chemistry info:eu-repo/semantics/altIdentifier/doi/10.1039/C4JA00265B hal-01134921 https://hal.science/hal-01134921 doi:10.1039/C4JA00265B ISSN: 0267-9477 EISSN: 1364-5544 Journal of Analytical Atomic Spectrometry https://hal.science/hal-01134921 Journal of Analytical Atomic Spectrometry, 2014, 29 (2), pp.2330-2342. ⟨10.1039/C4JA00265B⟩ [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/article Journal articles 2014 ftunivnantes https://doi.org/10.1039/C4JA00265B 2023-03-08T07:32:11Z International audience This study presents new Os isotope and elemental data of seawater from the North Atlantic Ocean. Two techniques have been optimised and used to achieve tracer–seawater equilibration: (i) heating of a seawater–tracer mixture at 100 °C with Br2, CrO3 and H2SO4 in Teflon bombs and solvent extraction of OsO4 with Br2; and (ii) heating of a seawater–tracer mixture to 300 °C with CrO3 and H2SO4 in a sealed glass tube (HPA-S-s) at 125 bars and back extraction with Br2. Both techniques yield similar total procedural blanks in the range of 14–18 fg, and have a total Os yield that ranges from 86 to 92%. For the 200 fg Os standard, the effective ionisation efficiency is between 6 and 10% demonstrating that single filament ionization is capable of achieving significant Os sensitivity. To assess the external reproducibility on the 187Os/188Os ratio, both methods have been systematically applied to a single sample from a water depth of 2000 m and yield an indistinguishable 187Os/188Os ratio of 1.026 ± 0.017 (n = 11) and 1.020 ± 0.013 (n = 3), for techniques (i) and (ii), respectively. The external reproducibility on the 187Os/188Os ratio and Os concentration is 1.6% and 3.7% respectively, demonstrating the capability of both methods for analysing Os in natural water. Both procedures have been applied to a seawater profile from the North East Atlantic Ocean (IB13: 60°29.4′ N, 19°59.2′ W, 2650 m water depth). The results show little measurable variability in either Os concentration or isotope composition with depth and the overall average for the whole profile is 1.024 ± 0.031 (3%) for the 187Os/188Os ratio and 9.68 ± 0.48 (4.9%) pg kg−1 for the Os concentration. Therefore, for this locality at least, Os appears to behave conservatively. Article in Journal/Newspaper North Atlantic North East Atlantic Université de Nantes: HAL-UNIV-NANTES J. Anal. At. Spectrom. 29 12 2330 2342 |
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Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
spellingShingle |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Gannoun, Abdelmouhcine Burton, Kevin W. High precision osmium elemental and isotope measurements of North Atlantic seawater |
topic_facet |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
International audience This study presents new Os isotope and elemental data of seawater from the North Atlantic Ocean. Two techniques have been optimised and used to achieve tracer–seawater equilibration: (i) heating of a seawater–tracer mixture at 100 °C with Br2, CrO3 and H2SO4 in Teflon bombs and solvent extraction of OsO4 with Br2; and (ii) heating of a seawater–tracer mixture to 300 °C with CrO3 and H2SO4 in a sealed glass tube (HPA-S-s) at 125 bars and back extraction with Br2. Both techniques yield similar total procedural blanks in the range of 14–18 fg, and have a total Os yield that ranges from 86 to 92%. For the 200 fg Os standard, the effective ionisation efficiency is between 6 and 10% demonstrating that single filament ionization is capable of achieving significant Os sensitivity. To assess the external reproducibility on the 187Os/188Os ratio, both methods have been systematically applied to a single sample from a water depth of 2000 m and yield an indistinguishable 187Os/188Os ratio of 1.026 ± 0.017 (n = 11) and 1.020 ± 0.013 (n = 3), for techniques (i) and (ii), respectively. The external reproducibility on the 187Os/188Os ratio and Os concentration is 1.6% and 3.7% respectively, demonstrating the capability of both methods for analysing Os in natural water. Both procedures have been applied to a seawater profile from the North East Atlantic Ocean (IB13: 60°29.4′ N, 19°59.2′ W, 2650 m water depth). The results show little measurable variability in either Os concentration or isotope composition with depth and the overall average for the whole profile is 1.024 ± 0.031 (3%) for the 187Os/188Os ratio and 9.68 ± 0.48 (4.9%) pg kg−1 for the Os concentration. Therefore, for this locality at least, Os appears to behave conservatively. |
author2 |
Laboratoire Magmas et Volcans (LMV) Observatoire de Physique du Globe de Clermont-Ferrand (OPGC) Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS) Department of Earth Sciences Durham Durham University |
format |
Article in Journal/Newspaper |
author |
Gannoun, Abdelmouhcine Burton, Kevin W. |
author_facet |
Gannoun, Abdelmouhcine Burton, Kevin W. |
author_sort |
Gannoun, Abdelmouhcine |
title |
High precision osmium elemental and isotope measurements of North Atlantic seawater |
title_short |
High precision osmium elemental and isotope measurements of North Atlantic seawater |
title_full |
High precision osmium elemental and isotope measurements of North Atlantic seawater |
title_fullStr |
High precision osmium elemental and isotope measurements of North Atlantic seawater |
title_full_unstemmed |
High precision osmium elemental and isotope measurements of North Atlantic seawater |
title_sort |
high precision osmium elemental and isotope measurements of north atlantic seawater |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.science/hal-01134921 https://doi.org/10.1039/C4JA00265B |
genre |
North Atlantic North East Atlantic |
genre_facet |
North Atlantic North East Atlantic |
op_source |
ISSN: 0267-9477 EISSN: 1364-5544 Journal of Analytical Atomic Spectrometry https://hal.science/hal-01134921 Journal of Analytical Atomic Spectrometry, 2014, 29 (2), pp.2330-2342. ⟨10.1039/C4JA00265B⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1039/C4JA00265B hal-01134921 https://hal.science/hal-01134921 doi:10.1039/C4JA00265B |
op_doi |
https://doi.org/10.1039/C4JA00265B |
container_title |
J. Anal. At. Spectrom. |
container_volume |
29 |
container_issue |
12 |
container_start_page |
2330 |
op_container_end_page |
2342 |
_version_ |
1766130092708200448 |