| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Measuring production-dissolution rates of marine biogenic silica by Si-30-isotope dilution using a high-resolution sector field inductively coupled plasma mass spectrometer
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| Autores: |
Fripiat, Francois
Corvaisier, Rudolph
Navez, Jacques
Elskens, Marc
Schoemann, Veronique
Leblanc, Karine
Andre, Luc
Cardinal, Damien
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| Data: |
2009-07
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| Ano: |
2009
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| Palavras-chave: |
Isotopic fractionation
Southern ocean
Acid uptake
Waters
Phytoplankton
Environments
Biosilica
Recovery
Balance
Tracer
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| Resumo: |
Regional and seasonal variability of the Si dissolution: production ratios in the surface ocean have not been well assessed. Here, we propose a new method for determining these rates, using the Si-30-isotopic dilution technique with a high-resolution sector field inductively coupled plasma mass spectrometer (HR-SF-ICP-MS). Relative analytical precision of the isotopic measurement is better than 1%, similar to that obtained by thermal ionization-quadrupole mass spectrometry (TIMS). Accuracy and reproducibility of the isotopic measurements have been checked on artificial and natural solutions by intercomparison between two HR-SF-ICP-MS instruments and one TIMS. Measurements of real Si production and dissolution rates are illustrated for two contrasted situations with an average relative precision of 10%, including one from waters with low Si content (2 mu mol L-1), which required an additional purification step by cation exchange chromatography. Si production rate from this later incubation was not significantly different from the one measured by radioactive Si-32. The new method is faster and simpler than TIMS or isotope ratio mass spectrometry (IRMS). Its sensitivity is more than one order of magnitude better than TIMS, and it can cover the whole range of Si concentrations encountered in the ocean.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
https://archimer.ifremer.fr/doc/00205/31607/30033.pdf
https://archimer.ifremer.fr/doc/00205/31607/
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| Editor: |
Amer Soc Limnology Oceanography
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| Formato: |
application/pdf
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| Fonte: |
Limnology And Oceanography-methods (1541-5856) (Amer Soc Limnology Oceanography), 2009-07 , Vol. 7 , P. 470-478
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| Direitos: |
2009, by the American Society of Limnology and Oceanography, Inc.
info:eu-repo/semantics/openAccess
restricted use
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