An experimental study of fractionation of the rare earth elements in poplar plants (Populus eugenei) grown in a calcium-bearing smectite soil

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Show simple item record Weber, Robert Joseph 2008-08-15T15:37:32Z 2008-08-15T15:37:32Z 2008-08-15T15:37:32Z
dc.description.abstract Rare earth element (REE) concentrations were measured in a source (reference) clay Ca-smectite standard and in the roots, stems, and leaves of a species of poplar plant (Populus eugenei). The poplar plant was grown in the clay standard under controlled laboratory conditions during a period of about three months. REEs were shown to fractionate in the clay mineral and plant materials with greater fractionation observed in plant materials. The REE data provide insight into the process of weathering of clay minerals such as a Ca-bearing smectite and provide insight into the degradation of and the composition of clay minerals in the plant environment. The degradation process is not followed by significant interlayer ion exchange effect on remaining clay minerals in the root environment. REEs were found to be transported into complex forms, potentially as REE-carboxylic anion pair complexes. The plant materials in this study were in general heavy REE (HREE) enriched relative to the source clay minerals due to the complexation effect. The REE anomalies observed in this study, in addition to the Ce and Eu anomalies, may be explained by the selective uptake by the plant by an enzyme effect rather than due to the influence of oxidation-reduction. The enzyme influence was more evident in the REE distribution when compared among the plant organs. These REE characteristics described for the plants may eventually be incorporated with data from numerous other studies and also used as a guide in the assessment of the contribution of plant materials to dissolved REE content in surface water and groundwater. en
dc.language.iso en_US en
dc.publisher Kansas State University en
dc.subject Rare earth element en
dc.subject Fractionation en
dc.subject Poplar en
dc.subject Clay en
dc.subject Complexation en
dc.subject Enzyme en
dc.title An experimental study of fractionation of the rare earth elements in poplar plants (Populus eugenei) grown in a calcium-bearing smectite soil en
dc.type Thesis en Master of Science en
dc.description.level Masters en
dc.description.department Department of Geology en
dc.description.advisor Sambhudas Chaudhuri en
dc.subject.umi Biology, General (0306) en
dc.subject.umi Geochemistry (0996) en
dc.subject.umi Geology (0372) en 2008 en August en

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