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Diffusive Gradients in Thin Films (DGT) Devices as Biomimics for Bioaccessible Rare Earth Elements (REEs) in Soil

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Title: Diffusive Gradients in Thin Films (DGT) Devices as Biomimics for Bioaccessible Rare Earth Elements (REEs) in Soil
Author: Pereira, Bianca
Department: School of Environmental Sciences
Program: Environmental Sciences
Advisor: Hale, Beverley
Abstract: Using the bioaccessible concentration to which plant roots and microorganisms are exposed may provide a better estimation for toxicity than using total concentration. Bioaccessibility of REEs in highly organic soil were measured using Diffusive Gradient in Thin Films (DGT) and partial extractions with CaCl2. The correlation of DGT accumulation to other bioaccessible determining methods and plant roots were weak. Modifications to the DGT SOP such as increasing deployment time and resupplying the labile pool to the DGT surface improved these relations. To some extent, DGT mimics the action of plants if plant uptake is limited by diffusion. Therefore, DGT is capable of serving as a predictor of plant uptake and availability of the rare earth metals. This is the first study that demonstrates the suitability of measuring REEs with DGT in soil.
URI: http://hdl.handle.net/10214/12964
Date: 2018-04


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