Fate of Contaminants of Emerging Concern in a Sinkhole Lake, Florida, USA

  • Van Beynen Philip
  • Ethan Upton University of South Florida, Florida, USA
  • Ela Bialkowska-Jelinska University of South Florida, Florida, USA
  • Laurent Calcul University of South Florida, Florida, USA
Keywords: sinkhole lake, contaminants of emerging concern, Florida,, karst,, onsite water treatment systems


Highly karstified carbonate platforms such as Florida are characterized by rapid infiltration rates, highly permeable bedrock and the direct connection to the below aquifer through the high density of sinkholes. This combination of physical features makes the groundwater and aquifers highly vulnerable to contamination from synthetic chemicals commonly referred to as contaminants of emerging concern (CECs). The use of septic tanks, otherwise referred to as onsite water treatment systems (OWTS), promotes the introduction of CECs into the environment. In order to study the impacts of CECs from OWTS on a karst landscape, water, sediment, and vegetation samples were collected in a sinkhole lake surrounded by residential housing using this waste disposal method. The main question of this research project is what is the fate of CECs from OWTSs effluent within the catchment of a sinkhole lake? Liquid chromatograph mass spectrometry was used to analyze the samples for the presence of CECs. It was found that the relative quantity of CECs in the individual constituents is dependent upon 1) the hydrophobicity and polarity of the individual compound, 2) the specific sampling site, 3) the topography gradient, and 4) for vegetation, the connectedness of the sample type to the sediment. Hydrogeological studies have found that the sinkholes of the area are all connected to the below aquifer. Consequently, these CECs pose a risk of the contamination of the groundwater. This study is a temporal snapshot, that being the dry season of Florida which is most likely the time of lowest CEC contamination. It is imperative that sampling extend into the wet season when flushing of CECs from the OWTS may increase their concentrations in both the lake but also the aquifers especially since residents use well water as their source of potable water. While this study is based in Florida, we strongly suspect that our findings and recommendations are applicable more generally as OWTS are used throughout the many karst regions of the world.


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How to Cite
Philip VB, Upton E, Bialkowska-JelinskaE, Calcul L. Fate of Contaminants of Emerging Concern in a Sinkhole Lake, Florida, USA. AC [Internet]. 2020Dec.16 [cited 2021Jan.17];49(2-3). Available from: https://ojs.zrc-sazu.si/carsologica/article/view/8007
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