Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/11134
Title: | Radiocaesium dispersion and fixation in the lagoon systems of "Ria de Aveiro", Portugal |
Author: | Bobos, I. Rocha, F. |
Keywords: | Radiocaesium Distribution coefficient Silty-clay sediments Lagoon systems of “Ria de Aveiro” Portugal |
Issue Date: | 2006 |
Publisher: | Elsevier |
Abstract: | Radiocaesium (137Cs) dispersion and Cs+ fixation were studied in the sediments collected from the lagoon systems of “Ria de Aveiro”. The Cs+ sorption was tested for the fine mica grains and for the < 2 μm clay fractions extracted from silty clays. The Cs+ exchange is found strongly onto mica-rich fractions than smectite-rich fractions. The distribution coefficient increases if the silty material is constituted by rich-mica clay fractions or if the non-clay minerals are removed from the silty-clay material. The samples studied behave as multisite ion exchange, where Cs+ engages in ion-exchange reactions with hydrated cations on planar sites on expansible layer silicates. Higher concentrations of the 137Cs were found associated with mica-rich silty clays. The 137Cs ranges from 3.2 to 3.9 Bq kg− 1 in the < 38 μm fractions and from 2.9 to 3.3 Bq kg− 1 in the < 64 μm fractions. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/11134 |
DOI: | 10.1016/j.gexplo.2005.08.077 |
ISSN: | 0375-6742 |
Appears in Collections: | DBio - Artigos |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Radiocaesium dispersion and fixation in the lagoon.pdf | 320.67 kB | Adobe PDF |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.