Toxic effects of rare earth elements (cerium, europium, and neodymium) on radish, tomato, and durum wheat

dc.contributor.advisorHale, Beverley
dc.contributor.authorPellegrino, Amanda
dc.date.accessioned2018-05-07T17:38:25Z
dc.date.available2018-05-07T17:38:25Z
dc.date.copyright2018-04
dc.date.created2018-04-13
dc.date.issued2018-05-07
dc.degree.departmentSchool of Environmental Sciencesen_US
dc.degree.grantorUniversity of Guelphen_US
dc.degree.nameMaster of Scienceen_US
dc.degree.programmeEnvironmental Sciencesen_US
dc.description.abstractRare earth elements (REEs), or rare earth metals, are a group of 17 elements including the lanthanide series, yttrium and scandium. They occur naturally together in mineral deposits, have similar properties, and are being used at increasing rates in new technology. At low REE concentrations in soils, plant growth stimulation has been identified; however, at higher concentrations, toxicity has been determined for some REEs. Toxic effect concentrations (shoot/root length, and shoot biomass) for radish, tomato and durum wheat were determined for three REEs: cerium, neodymium, and europium. A hormetic response was not characterized by any of the data, however many endpoints displayed thresholds. Overall, effect concentrations (EC25) ranged from 900-7600 mg/kg; these were higher than those reported in previous literature, likely due to low bioaccessibility of REEs in the highly organic soil. Internal tissue concentrations might therefore be a better predictor of toxicity.en_US
dc.description.sponsorshipEnvironment and Climate Change Canada
dc.description.sponsorshipNatural Sciences and Engineering Research Council of Canada
dc.identifier.urihttp://hdl.handle.net/10214/12986
dc.language.isoenen_US
dc.publisherUniversity of Guelphen_US
dc.rightsAttribution-NonCommercial-NoDerivs 2.5 Canada*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/2.5/ca/*
dc.subjectrare earth elementsen_US
dc.subjectceriumen_US
dc.subjecteuropiumen_US
dc.subjectneodymiumen_US
dc.subjectplantsen_US
dc.subjecttoxicityen_US
dc.titleToxic effects of rare earth elements (cerium, europium, and neodymium) on radish, tomato, and durum wheaten_US
dc.typeThesisen_US

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