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PHYTOREMEDIATION OF SELENIUM-IMPACTED WATER BY AQUATIC MACROPHYTES
Nattrass M., N.R. McGrew, J.I. Morrison, and B.S. Baldwin.
Journal American Society of Mining and Reclamation 8(1):69-79(2019)

The bioavailability of selenium (Se) chemical form and concentration on plant uptake were evaluated to determine the potential of aquatic macrophytes to improve water quality in a constructed wetland. The experiment was arranged as a 2x2 factorial nested within a split-split plot design replicated three times. Selenium treatments were applied to cattail (CT), duckweed (DWD), fanwort (CAB), soft rush (SR), muskgrass (MG), and unplanted controls (UNP) as a 4-L solution of either sodium selenite or sodium selenate to a total volume of 30 L at 0, 500, or 1000 µg/L Se. After six days, CT and MG-planted microcosms significantly decreased aqueous Se by 75 and 74%, respectively, compared to 61% for UNP. The aqueous fraction of microcosms planted to CAB, DWD, and SR were similar to UNP controls. Plant tissue Se content in CT was significantly less than CAB, DWD, or MG, suggesting CT has the potential to volatilize Se. Given its abundance and efficacy, CT is likely a suitable species for Se removal in constructed wetlands supplied with either selenite or selenate-impacted waters. This article is Open Access at https://www.asmr.us/Portals/0/Documents/Journal/Volume-8-Issue-1/Nattrass-MS.pdf



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