Data/hora: 05/06/2024 02:43:46

Provedor de dados: 	5	
País: 	France	
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	
Autores: 	Fripiat, Francois; Corvaisier, Rudolph; Navez, Jacques; Elskens, Marc; Schoemann, Veronique; Leblanc, Karine; Andre, Luc; Cardinal, Damien.	
Data: 	2009-07	
Ano: 	2009	
Palavras-chave: 	Isotopic fractionation; Southern ocean; Acid uptake; Waters; Phytoplankton; Environments; Biosilica; Recovery; Balance; Tracer.	
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.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	https://archimer.ifremer.fr/doc/00205/31607/30033.pdf

https://archimer.ifremer.fr/doc/00205/31607/	
Editor: 	Amer Soc Limnology Oceanography	
Formato: 	application/pdf	
Fonte: 	Limnology And Oceanography-methods (1541-5856) (Amer Soc Limnology Oceanography), 2009-07 , Vol. 7 , P. 470-478	
Fonte: 	2009, by the American Society of Limnology and Oceanography, Inc.

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