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Evaluating the effects of triclosan on field crops and arbuscular mycorrhizal fungi in biosolids-amended soil

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Title: Evaluating the effects of triclosan on field crops and arbuscular mycorrhizal fungi in biosolids-amended soil
Author: Shahmohamadloo, René Sahba
Department: School of Environmental Sciences
Program: Environmental Sciences
Advisor: Sibley, Paul
Abstract: Triclosan is routinely detected in municipal biosolids at relatively large concentrations, and has demonstrated the potential to resist degradation in agricultural fields upon land application. This understanding about triclosan, and a host of other emerging substances of concern found in biosolids forms the basis of the general public’s concern that these chemicals may adversely impact human and environmental health. The scientific literature’s findings on triclosan in biosolids is limited to one or two types of formulations, ergo an assessment of multiple types of biosolids could address more fully the public’s concern. Thus, the objective of this thesis was to determine whether triclosan in four formulations of biosolids could adversely impact plant emergence, growth, and colonization by arbuscular mycorrhizal fungi of three crop species. Experiments were conducted in the laboratory. Plants were grown in biosolids-amended soil spiked with triclosan at increasing concentrations. No dose-response trend could be established between triclosan and various measures of growth across three crop species grown in four formulations of biosolids. The colonization of arbuscular mycorrhizal fungi, too, was not inhibited by the presence of triclosan. The results generated in this thesis indicate that triclosan in biosolids presents a de minimis risk to crops.
Date: 2016-05
Rights: Attribution-NonCommercial-NoDerivs 2.5 Canada
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Attribution-NonCommercial-NoDerivs 2.5 Canada Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 2.5 Canada