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Estimating phytotoxicity of complex metal mixtures in mine-degraded soils: modelling contaminant and non-contaminant growth controlling factors

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dc.contributor.advisor Hale, Beverley
dc.contributor.author Arora, Pooja
dc.date.accessioned 2019-05-15T20:10:16Z
dc.date.available 2019-05-15T20:10:16Z
dc.date.copyright 2019-04
dc.date.created 2019-05-02
dc.date.issued 2019-05-15
dc.identifier.uri http://hdl.handle.net/10214/16109
dc.description.abstract Data are limited for the phytotoxicity of metal mixtures in field applications. Naturally aged and leached soils from a decommissioned Ontario gold mine were used to establish phytotoxicity thresholds for mixtures of As, Co, Cu, Zn, and Ni. Growth studies were conducted with barley (Hordeum vulgare L.) and tomato (Lycopersicon esculentum), using seedling emergence, shoot length, and shoot/root dry weight as growth response endpoints. Structural Equation Modelling and Multiple Linear Regression were applied to evaluate growth-inhibiting parameters of non-contaminant factors (pH, clay, and OC). Barley and tomato emergence were explained by the direct effect of OC. Clay had the most significant indirect effect through Mg (tomato) and Cu (barley) root uptake. Soil physicochemical properties critically modified phytotoxicity of metals via uptake of essential cations, with OC acting as the master soil variable for phytotoxic mechanisms. This study will aid to estimate phytotoxicity thresholds for risk assessment of metal-contaminated soils worldwide. en_US
dc.description.sponsorship NSERC, Environment and Climate Change Canada, Vale, Glencore, and Stantec en_US
dc.language.iso en en_US
dc.subject Bioavailability en_US
dc.subject Metal Mixtures en_US
dc.subject Mining en_US
dc.subject Phytotoxicity en_US
dc.subject Ecological Risk Assessment en_US
dc.title Estimating phytotoxicity of complex metal mixtures in mine-degraded soils: modelling contaminant and non-contaminant growth controlling factors en_US
dc.type Thesis en_US
dc.degree.programme Environmental Sciences en_US
dc.degree.name Master of Science en_US
dc.degree.department School of Environmental Sciences en_US
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