Typha latifolia ?common cattail? as a green tool in the waste water recycling process in Argentine. A case of study about bioaccumulation and biodegradation of contaminants of emerging concern.

PÉREZ, D.J; DOUCETTE, WILLIAM; MOORE, M; MENONE MIRTA L.; LOMBARDERO, LR

Conferencia; 5th Green & Sustainable Chemistry Conference ONLINE: Live and On- demand; 2020

Argentina is a developing country where the implementation of wetlandplants could be a green promise tool to reduce the contaminants of emerging concern (CEC)levels in the reclaimed water process. Methods: To this end, thirty-six plantshydroponically grown of cattails (Typha latifolia) were exposed to carbamazepine,fluoxetine, gemfibrozil, trichlosan and atrazine at environmentally relevant concentrationsnear 20 μg/L, under semi-static exposure bioassay. Uptake, distribution, bioaccumulationof CECs and the biodegradation of atrazine within the plants were evaluated at several timeperiods over a 42 day growing period. Whole plants were harvested at days 7, 14, 21, 28, 35and 42 days. Concentrations of CECs in various plant tissues were determined afterextraction, concentration and cleanup by LC-MSMS. Results: Carbamazepine, fluoxetine,gemfibrozil, triclosan and atrazine were detected in all underwater tissues (roots, rhizomeand sprouts) and abovewater tissues, except gemfibrozil which was not detected in shoots(Fig.1). Carbamazepine concentrations were 30-40 times highest in upper leaves thanbelow-water tissues, its accumulation was depended the exposure time and watertranspirated (Fig.1 and Fig.2). Above-water tissue concentrations for fluoxetine werehighest in the lower leaves and similar to the concentrations in the below water tissues.Triclosan concentrations were greatest in roots and were about 50 higher than leaves.Atrazine and its metabolites (desethyl-atrazine, desisopropyl-atrazine) werebioaccumulated in middle and upper leaves. Discussion: The results show that the rootuptake, translocation and distribution within the plant tissues varies with the physicalchemical properties of CECs and longer exposures result in higher leaf concentrations forthose compounds that are translocated from root to shoot. This study highlight theimportance to use an American native hydrophyte in natural, semi-natural or constructedwetlands for reduce CEC levels in the reclaimed water process, a bio-resource green toolwhich was actually not common implemented in Argentina in the water treatment plant.