Azoll a caroliniana A model for Arsenic Remediation. A.M. Duncan and J.F. Gottgens Department of Environmental Sciences University of Toledo. Sponsor: USDA-CSREES (2005-38894-02307) Technical assistance: ARS-USDA (Jonathan Frantz, Doug Sturtz
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A.M. Duncan and J.F. Gottgens
Department of Environmental Sciences
University of Toledo
Sponsor: USDA-CSREES (2005-38894-02307)
Technical assistance: ARS-USDA (Jonathan Frantz, Doug Sturtz
Greenhouse space: UT Plant Science Research Center
Collaborators: Defne Apul, Daryl Dwyer, Jordan Rofkar
In the U.S., arsenic contaminated drinking water is a serious threat. Some 56 million people in the U.S. have drinking water with unsafe arsenic levels (NRCD 2001)
77 million people are drinking water in Bangladesh with toxic levels of Arsenic (CNN 2010)
Due to its extreme toxicity and high prevalence in the environment, the Department of Health and Human Services has ranked arsenic as the number one contaminant of concern to human health.
Cancer (skin, kidney, liver, lung…...)
Neurological Disorders (neuropathy)
Gangrene (Blackfoot disease)
Toledo Glass Company Sheet Glass Plant
Currently no inexpensive, efficient option for removing arsenic from contaminated water.
Arsenic concentrations in brake fern after 20 weeks’ growth in a soil containing 97ppm As.
Chinese brake fern (Pteris vittata)
Source: Ma et al. (Nature, 2001)
Source: Carbonell et al. (1999)
Growth inhibition increased from DMAA < As (III) < MMAA < As (V)
Frond discoloration and reduced growth with MMAA exposure have been linked to decreases of Mg and K in planttissue (Carbonell et al. 1998).
Frond chlorosis as a result of arsenate exposure has been linked to reductions in sulfur (Wong 2005)
Red pigmentation (anthocyanin) increased with increasing As levels
Goal: Track the pathway of arsenic through the experimental system and to predict uptake trends over time.
Average mass of As removed over time by A. caroliniana for exposures to 500, 1000, and 1500 ppb.
Data fitted with power trendline.