Interaction of europium and nickel with calcite studied by Rutherford Backscattering Spectrometry and Time-Resolved Laser Fluorescence Spectroscopy

This study aims at elucidating the mechanisms regulating the interaction of Eu and Ni with calcite (CaCO3). Calcite powders or single crystals (some mm sized) were put into contact with Eu or Ni solutions at concentrations ranging from 10−3 to 10−5molL−1 for Eu and 10−3molL−1 for Ni. The sorption du...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2014-08, Vol.332, p.111-116
Main Authors: Sabau, A., Pipon, Y., Toulhoat, N., Lomenech, C., Jordan, N., Moncoffre, N., Barkleit, A., Marmier, N., Brendler, V., Surblé, S., Giffaut, E.
Format: Article
Language:English
Subjects:
Calcite
Chemical Sciences
Europium
Fluorescence
Lasers
Minerals
Nickel
Physics
RBS
Sorption
Spectroscopy
TRLFS
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Summary:This study aims at elucidating the mechanisms regulating the interaction of Eu and Ni with calcite (CaCO3). Calcite powders or single crystals (some mm sized) were put into contact with Eu or Ni solutions at concentrations ranging from 10−3 to 10−5molL−1 for Eu and 10−3molL−1 for Ni. The sorption durations ranged from 1week to 1month. Rutherford Backscattering Spectrometry (RBS) well adapted to discriminate incorporation processes such as: (i) adsorption or co precipitation at the mineral surfaces or, (ii) incorporation into the mineral structure (through diffusion for instance), has been carried out. Moreover, using the fluorescence properties of europium, the results have been compared to those obtained by Time-Resolved Laser Fluorescence Spectroscopy (TRLFS) on calcite powders. For the single crystals, complementary SEM observations of the mineral surfaces at low voltage were also performed. Results showed that Ni accumulates at the calcite surface whereas Eu is also incorporated at a greater depth. Eu seems therefore to be incorporated into two different states in calcite: (i) heterogeneous surface accumulation and (ii) incorporation at depth greater than 160nm after 1month of sorption. Ni was found to accumulate at the surface of calcite without incorporation.
ISSN:0168-583X
1872-9584
DOI:10.1016/j.nimb.2014.02.041