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  • 1.
    Grasse, P.
    et al.
    GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany.
    Brezezinski, M.
    Marine Science Institute and the Department of Ecology, Evolution, and Marine Biology & University of California, USA.
    Cardinal, D.
    Sorbonne Universités, Paris, France.
    de Souza, G.F.
    ETH Zurich, Institute of Geochemistry and Petrology, Switzerland.
    Andersson, Per
    Swedish Museum of Natural History, Department of Geology.
    Closset, I.
    Sorbonne Universités, Paris, France.
    Cao, Z.
    State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, China.
    Dai, M.
    State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, China.
    Ehlert, C.
    Max Planck Research Group for Marine Isotope Geochemistry, University of Oldenburg, Germany.
    Estrade, N.
    University of British Columbia, Vancouver, British Columbia,.
    Francois, R.
    University of British Columbia, Vancouver, British Columbia,.
    Frank, M.
    GEOMAR, Helmholtz Centre for Ocean Research Kiel, Germany.
    Jiang, G.
    Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.
    Jones, J.L.
    Marine Science Institute and the Department of Ecology, Evolution, and Marine Biology, University of California, Santa Barbara USA.
    Kooijman, E.
    Swedish Museum of Natural History, Department of Geology.
    Liu, Q.
    Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.
    Lu, D.
    Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.
    Pahnke, K.
    Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Germany.
    Ponzevera, E.
    Unité de Recherche Géosciences Marines, IFREMER, Brest, France.
    Schmitt, M.
    Swedish Museum of Natural History, Department of Geology.
    Sun, S.
    Department of Environmental Science and Analytical Chemistry, Stockholm University, Sweden.
    Sutton, J.N.
    Universite de Brest, CNRS, IRD, IFREMER, LEMAR, IUEM, France.
    Thil, F.
    LSCE/IPSL - Laboratoire des Sciences du Climat et de l'Environnement, Gif sur Yvette, France.
    Weis, D.
    University of British Columbia Pacific Center for Isotopic and Geochemical Research, Vancouver, British Columbia,Canada .
    Wetzel, F.
    ETH Zurich, Institute of Geochemistry and Petrology, Switzerland.
    Zhang, A.
    State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, China.
    Zhang, J.
    State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, China.
    Zhang, Z.
    State Key Laboratory of Marine Environmental Science,Xiamen University,.
    GEOTRACES Intercalibration of the Stable Silicon Isotope Composition of Dissolved Silicic Acid in Seawater2017In: Journal of Analytical Atomic Spectrometry, ISSN ISSN 0267-9477, Vol. 32, p. 562-578Article in journal (Refereed)
    Abstract [en]

    The first inter-calibration study of the stable silicon isotope composition of dissolved silicic acid in seawater, d30Si(OH)4, is presented as a contribution to the international GEOTRACES program. Eleven laboratories from seven countries analyzed two seawater samples from the North Pacific subtropical gyre (Station ALOHA) collected at 300 m and at 1000 m water depth. Sampling depths were chosen to obtain samples with a relatively low (9 mmol L-1, 300 m) and a relatively high (113 mmol L-1, 1000 m) silicic acid concentration as sample preparation differs for low- and high concentration samples. Data for the 1000 m water sample were not normally distributed so the median is used to represent the central tendency for the two samples. Median d30Si(OH)4 values of +1.66‰ for the low-concentration sample and +1.25‰ for the high-concentration sample were obtained. Agreement among laboratories is overall considered very good; however, small but statistically significant differences among the mean isotope values obtained by different laboratories were detected, likely reflecting inter-laboratory differences in chemical preparation including preconcentration and purification methods together with different volumes of seawater analyzed, andthe use of different mass spectrometers including the Neptune MC-ICP-MS (Thermo Fisher™, Germany), the Nu Plasma MC-ICP-MS (Nu Instruments™, Wrexham, UK), and the Finnigan™ (now Thermo Fisher™, Germany) MAT 252 IRMS. Future studies analyzing d30Si(OH)4 in seawater should also analyze and report values for these same two reference waters in order to facilitate comparison of data generated among and within laboratories over time.

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