Radiocaesium dispersion and fixation in the lagoon systems of "Ria de Aveiro", Portugal

• Type: Article in International Scientific Journal
• Date: 2006

Authors

Bobos, I (Author) FCUP; Rocha, F (Author) Other

Journal

Title: Journal of Geochemical Exploration

Vol. 88

Pages: 367-372

ISSN: 0375-6742

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 2 Citations

Scopus - 2 Citations

Scientific classification

FOS: Natural sciences > Earth and related Environmental sciences

Other information

Authenticus ID: P-004-Q46

DOI: 10.1016/j.gexplo.2005.08.077

Abstract (EN): Radiocaesium (Cs-137) 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 mu m 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 Cs-137 were found associated with mica-rich silty clays. The 137Cs ranges from 3.2 to 3.9 Bq kg(-1) in the < 38 mu m fractions and from 2.9 to 3.3 Bq kg(-1) in the < 64 mu m fractions.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6