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Laboratoire d'études en Géophysique et océanographie spatiales |  |
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Laboratoire d'études en Géophysique et océanographie spatiales | |
| HAL: hal-00713278, version 1 |
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| Limnology and Oceanography : methods 10: (2012) 234-251 (IF 1,535) |
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| GEOTRACES intercalibration of neodymium isotopes and rare earth element concentrations in seawater and suspended particles. Part 1 : reproductibility of results for the international comparison |
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| T. Van De Flierdt 1K. Pahnke 2, 3 |
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| (2012) |
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| One of the key activities during the initial phase of the international GEOTRACES program was an extensive international intercalibration effort, to ensure that results for a range of trace elements and isotopes (TEIs) from different cruises and from different laboratories can be compared in a meaningful way. Here we present the results from the intercalibration efforts on neodymium isotopes and rare earth elements in seawater and marine particles. Fifteen different laboratories reported results for dissolved Nd-143/Nd-144 ratios in seawater at three different locations (BATS 15 m, BATS 2000 m, SAFe 3000 m), with an overall agreement within 47 to 57 ppm (2 sigma standard deviation of the mean). A similar agreement was found for analyses of an unknown pure Nd standard solution carried out by 13 laboratories (56 ppm), indicating that mass spectrometry is the main variable in achieving accurate and precise Nd isotope ratios. Overall, this result is very satisfactory, as the achieved precision is a factor of 40 better than the range of Nd isotopic compositions observed in the global ocean. Intercalibration for dissolved rare earth element concentrations (REEs) by six laboratories for two water depths at BATS yielded a reproducibility of 15% or better for all REE except Ce, which seems to be the most blank-sensitive REE. Neodymium concentrations from 12 laboratories show an agreement within 9%, reflecting the best currently possible reproducibility. Results for Nd isotopic compositions and REE concentrations on marine particles are inconclusive, and should be revisited in the future. |
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| 1: | Imperial College London |
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Imperial College London |
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| 2: | University of Hawaii |
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University of Hawaii at Manoa |
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| 3: | Carl von Ossietzky |
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University Oldenburg |
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| 4: | Kashiwa Atmosphere & Ocean Res. Institut |
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University of Tokyo |
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| 5: | Taipei Dpt of Geosciences |
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National University of Taiwan |
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| 6: | Swedish Museum |
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Museum National History |
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| 7: | University of Florida |
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University of Florida |
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| 8: | IDES (Université Paris-Sud XI) |
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CNRS : UMR8148 |
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| 9: | Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE) |
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CNRS : UMR8212 – CEA : DSM/LSCE – Université de Versailles Saint-Quentin-en-Yvelines |
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| 10: | IFM GEOMAR |
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University Kiel |
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| 11: | Lamont Doherty Earth Observatory |
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Columbia University |
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| 12: | Dpt Earth & Environm. Sciences |
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Columbia University |
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| 13: | Ahmadabad Geosceinces Division |
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Physic Research Laboratory |
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| 14: | OSU |
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COAS |
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| 15: | Department of Earth Sciences |
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University of Oxford |
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| 16: | Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) |
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CNRS : UMR5566 – Institut de recherche pour le développement [IRD] – CNES – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III |
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| 17: | Exxon Mobil |
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Mobil Production Co |
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| 18: | Godwin Lab. Palaeoclimate Research |
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University of Cambridge |
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| 19: | Columbia Dpt Earth & Ocean Science |
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University of South Carolina |
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| 20: | Columbia Marine Science Program |
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University of South Carolina |
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| 21: | Hirosaki Dpt Radiation Chem. |
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Hirosaki University |
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| 22: | School of Earth Sciences |
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University of Bristol |
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| GEOMAR |
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| Subject | : | Sciences of the Universe/Earth Sciences |
| hal-00713278, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00713278 | |
| oai:hal.archives-ouvertes.fr:hal-00713278 | |
| From: Kim Ho | |
| Submitted on: Friday, 29 June 2012 17:18:57 | |
| Updated on: Wednesday, 19 December 2012 13:14:30 | |
