GEOTRACES intercalibration of neodymium isotopes and rare earth element concentrations in seawater and suspended particles. Part 1 : reproductibility of results for the international comparison

T. Van De Flierdt; K. Pahnke; H. Amakawa; P. Andersson; C. Basak; B. Coles; C. Colin; K. Crocket; M. Frank; N. Frank; S.L. Goldstein; V. Goswami; B.A. Haley; E.C. Hathorne; S.R. Hemming; G.M. Henderson; C. Jeandel; K. Jones; K. Kreissig; F. Lacan; M. Lambelet; E.E. Martin; D.R. Newkirk; H. Obata; L. Pena; A.M. Piotrowski; C. Pradoux; H.D. Scher; H. Schoberg; S.K. Singh; T. Stichel; H. Tazoe; D. Vance; J.J. Yang

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Limnology and Oceanography : methods 10: (2012) 234-251 (IF 1,535)

GEOTRACES intercalibration of neodymium isotopes and rare earth element concentrations in seawater and suspended particles. Part 1 : reproductibility of results for the international comparison

T. Van De Flierdt ¹, K. Pahnke ^2, 3, H. Amakawa ^4, 5, P. Andersson ⁶, C. Basak ⁷, B. Coles ¹, C. Colin ^8, 9, K. Crocket ¹, M. Frank ¹⁰, N. Frank ⁹, S.L. Goldstein ^11, 12, V. Goswami ¹³, B.A. Haley ^10, 14, E.C. Hathorne ¹⁰, S.R. Hemming ^11, 12, G.M. Henderson ¹⁵, C. Jeandel ¹⁶, K. Jones ^11, 12, 17, K. Kreissig ¹, F. Lacan ¹⁶, M. Lambelet ¹, E.E. Martin ⁷, D.R. Newkirk ⁷, H. Obata ⁴, L. Pena ¹¹, A.M. Piotrowski ¹⁸, C. Pradoux ¹⁶, H.D. Scher ^19, 20, H. Schoberg ⁶, S.K. Singh ¹³, T. Stichel ^2, 10, H. Tazoe ²¹, D. Vance ²², J.J. Yang ¹⁵

(2012)

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.

1 :	Imperial College London

	Imperial College London

2 :	University of Hawaii

	University of Hawaii at Manoa

3 :	Carl von Ossietzky

	University Oldenburg

4 :	Kashiwa Atmosphere & Ocean Res. Institut

	University of Tokyo

5 :	Taipei Dpt of Geosciences

	National University of Taiwan

6 :	Swedish Museum

	Museum National History

7 :	University of Florida

	University of Florida

8 :	IDES (Université Paris-Sud XI)

	CNRS : UMR8148

9 :	Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE)

	CNRS : UMR8212 – CEA : DSM/LSCE – Université de Versailles Saint-Quentin-en-Yvelines

10 :	IFM GEOMAR

	University Kiel

11 :	Lamont Doherty Earth Observatory

	Columbia University

12 :	Dpt Earth & Environm. Sciences

	Columbia University

13 :	Ahmadabad Geosceinces Division

	Physic Research Laboratory

14 :	OSU

	COAS

15 :	Department of Earth Sciences

	University of Oxford

16 :	Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS)

	CNRS : UMR5566 – Institut de recherche pour le développement [IRD] – CNES – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III

17 :	Exxon Mobil

	Mobil Production Co

18 :	Godwin Lab. Palaeoclimate Research

	University of Cambridge

19 :	Columbia Dpt Earth & Ocean Science

	University of South Carolina

20 :	Columbia Marine Science Program

	University of South Carolina

21 :	Hirosaki Dpt Radiation Chem.

	Hirosaki University

22 :	School of Earth Sciences

	University of Bristol

Équipe de recherche : GEOMAR

Domaine

Planète et Univers/Sciences de la Terre


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Soumis le : Vendredi 29 Juin 2012, 17:18:57
Dernière modification le : Mercredi 19 Décembre 2012, 13:14:30