Data/hora: 02/06/2024 01:16:55

Provedor de dados: | 5
País: | France
Título: | The behavior of Al, Mn, Ba, Sr, REE and Th isotopes during in vitro degradation of large marine particles
Autores: | Arraes-mescoff, R; Roy-barman, M; Coppola, L; Souhaut, M; Tachikawa, K; Jeandel, C; Sempere, R; Yoro, C.
Data: | 2001-01
Ano: | 2001
Palavras-chave: | Marine particles; Dissolution; Trace elements; Thorium isotopes; Western Mediterranean Sea.
Resumo: | m) concentrations of Al, Sr, Ba, Mn, Rare Earth Elements (REE) and Th isotopes were determined over time. We obtain percentages of dissolution in agreement with the general knowledge about the solubility of these tracers: Th approximate to Al &lt; Heavy REE &lt; Light REE &lt; Mn &lt; Ba &lt; Sr. For Mn and Ce, precipitation/adsorption occurs at the end of the experiment probably due to their oxidation as insoluble oxides. Particulate residence time of the tracers ranged from less than 1 day to 10-14 days. During the experiment, biological activity has a control on the dissolution process through the remineralization of particulate organic carbon, In the 30 m experiment, the observed dissolution of aragonite indicates that the pH of the incubation solution significantly decreases in response to the CO2 respiration. Speciation calculations suggest that this pH shift leads to a decrease of the complexation of dissolved REE by carbonate ions. Th isotope data are consistent with an irreversible dissolution of Th and they do not support a rapid particle-solution chemical equilibrium.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00300/41128/40316.pdf

DOI:10.1016/S0304-4203(00)00065-7

https://archimer.ifremer.fr/doc/00300/41128/

Editor: | Elsevier Science Bv
Formato: | application/pdf
Fonte: | Marine Chemistry (0304-4203) (Elsevier Science Bv), 2001-01 , Vol. 73 , N. 1 , P. 1-19

Fonte:

2001 Elsevier Science B.V. All rights reserved.

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