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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2006

Autores

Bobos, I (Autor) FCUP; Rocha, F (Autor) Outra

Revista

Título: Journal of Geochemical Exploration

Vol. 88

Páginas: 367-372

ISSN: 0375-6742

Editora: Elsevier

Indexação

ISI Web of Knowledge - 2 Citações

Scopus - 2 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Ciências da terra e ciências do ambiente

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6