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IMPROVING PHYTOEXTRACTION OF ZINC AND ARSENIC WITH A SMALL ADDITION OF CHELATING AGENT NTA
Licinio, A., N. Brereton, C.F. Dussault, M. Labrecque, and F.E. Pitre.
IPC2017: 14th International Phytotechnologies Conference, 25-29 September, Montreal, Canada. Poster PS2-31-27, 2017

Chelating agents have been criticized for leaching into groundwater and damaging the soil microbiome. To avoid these problems, rapidly biodegradable nitrilotriacetic acid (NTA) was selected and used in small repeated doses to minimize potential leaching and toxicity during an evaluation of the As and Zn phytoextraction potentials of two species of willows, two grasses, and one commercial plant mix for soil stabilization. Both willow species extracted the highest levels of Zn, with over 100% more than in the best-performing grass species, whereas Festuca arundinacea and the commercial plant mix accumulated 100% to 200% more As than either willow species. The addition of NTA increased phytoextraction of Zn by an additional 35% for Salix purpurea and F. arundinacea, which was linked to an increase in above-ground biomass. Zn was successfully phytoextracted in the experiment with NTA addition, but As phytoextraction was overall mediocre regardless of the species and treatments used. See more on this study in pages 36-63 of A. Licinio's thesis at https://papyrus.bib.umontreal.ca/xmlui/handle/1866/19403.



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