Abstract
One main issue in the safety assessment of nuclear repositories, in which processes influence the distribution pattern of radionuclide elements in the biopshere when released radioactivity is carried with groundwater that penetrates through the bottom sediment of a lake. To be able to evaluate the transport of elements such as thorium, uranium, and rare earth elements (REE), sampling of lake sediment cores at different Swedish sites with different degrees of groundwater leakage was performed. Different lake sediment fractions have been identified. One fraction is related to aluminosilicates (clay and sand contents), while the other major fraction contains organic material. Enrichment of uranium is observed in areas of groundwater seepage, and U-contents is correlated to the levels of organic matter. Besides a higher mobility and enrichment of uranium compared to thorium is observed. Chondrite normalised REE sediment contents have been found higher in the most reducing sediments. The weathering and deposition processes are discussed in connection with the degree of mobility of elements. Elements as titanium, zirconium and hafnium are nearly insoluble in aqueous solutions. The immobility of these elements have been confirmed by this study. Hafnium is selected to study the differentiation of the sediment fraction originating from refractory and
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Citation Formats
Sundblad, B, Puigdomenech, I, and Mathiasson, L.
Interaction between geosphere and biosphere in lake sediments.
Sweden: N. p.,
1990.
Web.
Sundblad, B, Puigdomenech, I, & Mathiasson, L.
Interaction between geosphere and biosphere in lake sediments.
Sweden.
Sundblad, B, Puigdomenech, I, and Mathiasson, L.
1990.
"Interaction between geosphere and biosphere in lake sediments."
Sweden.
@misc{etde_10142461,
title = {Interaction between geosphere and biosphere in lake sediments}
author = {Sundblad, B, Puigdomenech, I, and Mathiasson, L}
abstractNote = {One main issue in the safety assessment of nuclear repositories, in which processes influence the distribution pattern of radionuclide elements in the biopshere when released radioactivity is carried with groundwater that penetrates through the bottom sediment of a lake. To be able to evaluate the transport of elements such as thorium, uranium, and rare earth elements (REE), sampling of lake sediment cores at different Swedish sites with different degrees of groundwater leakage was performed. Different lake sediment fractions have been identified. One fraction is related to aluminosilicates (clay and sand contents), while the other major fraction contains organic material. Enrichment of uranium is observed in areas of groundwater seepage, and U-contents is correlated to the levels of organic matter. Besides a higher mobility and enrichment of uranium compared to thorium is observed. Chondrite normalised REE sediment contents have been found higher in the most reducing sediments. The weathering and deposition processes are discussed in connection with the degree of mobility of elements. Elements as titanium, zirconium and hafnium are nearly insoluble in aqueous solutions. The immobility of these elements have been confirmed by this study. Hafnium is selected to study the differentiation of the sediment fraction originating from refractory and other physically weathered minerals. (au) (33 refs., 45 figs., 30 tbls.).}
place = {Sweden}
year = {1990}
month = {Dec}
}
title = {Interaction between geosphere and biosphere in lake sediments}
author = {Sundblad, B, Puigdomenech, I, and Mathiasson, L}
abstractNote = {One main issue in the safety assessment of nuclear repositories, in which processes influence the distribution pattern of radionuclide elements in the biopshere when released radioactivity is carried with groundwater that penetrates through the bottom sediment of a lake. To be able to evaluate the transport of elements such as thorium, uranium, and rare earth elements (REE), sampling of lake sediment cores at different Swedish sites with different degrees of groundwater leakage was performed. Different lake sediment fractions have been identified. One fraction is related to aluminosilicates (clay and sand contents), while the other major fraction contains organic material. Enrichment of uranium is observed in areas of groundwater seepage, and U-contents is correlated to the levels of organic matter. Besides a higher mobility and enrichment of uranium compared to thorium is observed. Chondrite normalised REE sediment contents have been found higher in the most reducing sediments. The weathering and deposition processes are discussed in connection with the degree of mobility of elements. Elements as titanium, zirconium and hafnium are nearly insoluble in aqueous solutions. The immobility of these elements have been confirmed by this study. Hafnium is selected to study the differentiation of the sediment fraction originating from refractory and other physically weathered minerals. (au) (33 refs., 45 figs., 30 tbls.).}
place = {Sweden}
year = {1990}
month = {Dec}
}