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Evaluating the ability of Alyssum murale to extract nickel from nickel-elevated soils from Port Colborne, Ontario

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Title: Evaluating the ability of Alyssum murale to extract nickel from nickel-elevated soils from Port Colborne, Ontario
Author: Zupfer, Kimberly
Department: School of Environmental Sciences
Program: Environmental Sciences
Advisor: Hale, Beverley
Abstract: Alyssum murale, a hyperaccumulator of Ni that is native to Ni-rich serpentine soils, is a species of interest for phytoremediation of Ni-elevated soils resulting from industry emissions in Port Colborne, Ontario. To determine the feasibility of using A. murale for Ni mass transfer, two phytoextraction studies were conducted. A 30-day scoping study determined short term extraction capability and results showed a decrease in total soil Ni concentration over time. To determine extraction efficiency over a growing season, a100-day study was conducted. Results showed a proportional decrease in total and extractable soil Ni concentrations and a constant partitioning coefficient over time, suggesting bioaccessibility of Ni did not decrease. Despite reduction in soil Ni concentration, there was not a mass balance between soil Ni mass reduction and A. murale Ni mass accumulation. Using modeling software and data from the phytoextraction studies, a hypothetical timeline for reduction in soil Ni mass was established.
URI: http://hdl.handle.net/10214/10310
Date: 2017-04
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