Event Title

Solubility of CuO Nanoparticles in Soil Pore Waters

Presenter Information

Joshua Hortin

Location

Eccles Conference Center Auditorium

Event Website

http://water.usu.edu

Start Date

3-31-2015 12:10 PM

End Date

3-31-2015 12:20 PM

Description

An understanding of engineered nanoparticle (ENP) solubility is important to fully understand the routes of their toxicity to plant and bacterial life. ENP dissolution has been studied in various biological, aqueous, and solid media, but never before in soil pore water solutions (to the best of our knowledge). Therefore, the dissolution of CuO ENPs were studied in four soil pore waters characteristic of western states (alkaline and calcareous) but cultivated under various conditions (low to high organic matter additions). Geochemical equilibrium modeling estimated that soil pore waters high in dissolved organic matter would dissolve the most CuO ENPs. Ten-day dissolution experiments found no correlations between any soil pore water component and the dissolution of the NPs, but the presence of dissolved organic matter seemed to inhibit dissolution of CuO ENPs in contrast to the predictions of geochemical equilibrium models. Greater than 99% of the dissolved copper in all soil pore water solutions was not in the free ion form, but was chelated by ligands. Chelation was therefore the driving factor of solubility at relatively high pH. More research into the species of organic matter that may inhibit ENP dissolution is needed.

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Mar 31st, 12:10 PM Mar 31st, 12:20 PM

Solubility of CuO Nanoparticles in Soil Pore Waters

Eccles Conference Center Auditorium

An understanding of engineered nanoparticle (ENP) solubility is important to fully understand the routes of their toxicity to plant and bacterial life. ENP dissolution has been studied in various biological, aqueous, and solid media, but never before in soil pore water solutions (to the best of our knowledge). Therefore, the dissolution of CuO ENPs were studied in four soil pore waters characteristic of western states (alkaline and calcareous) but cultivated under various conditions (low to high organic matter additions). Geochemical equilibrium modeling estimated that soil pore waters high in dissolved organic matter would dissolve the most CuO ENPs. Ten-day dissolution experiments found no correlations between any soil pore water component and the dissolution of the NPs, but the presence of dissolved organic matter seemed to inhibit dissolution of CuO ENPs in contrast to the predictions of geochemical equilibrium models. Greater than 99% of the dissolved copper in all soil pore water solutions was not in the free ion form, but was chelated by ligands. Chelation was therefore the driving factor of solubility at relatively high pH. More research into the species of organic matter that may inhibit ENP dissolution is needed.

https://digitalcommons.usu.edu/runoff/2015/2015Posters/14