Date of Award

2022

Degree Type

Thesis

Degree Name

Master of Science in Oceanography

Department

Oceanography

First Advisor

Rainer Lohmann

Abstract

Exposure to per- and polyfluoroalkyl substances (PFAS) has been associated with toxicities in wildlife and negative health effects in humans. Decades of fire training activity at Joint Base, Cape Cod, Massachusetts incorporated the use of aqueous film forming foam (AFFF) which resulted in long-term PFAS contamination of sediments, groundwater, and hydrologically connected surface waters. To explore the bioaccumulative potential of PFAS residing in complex environmental mixtures, a mesocosm was established to evaluate bioconcentration of PFAS from AFFF-contaminated groundwater by flow-through design. Fathead minnows (n = 24) were exposed to PFAS in groundwater over a 21-day period and tissue specific PFAS burdens in liver, kidney, and gonad were derived at three different time points. ΣPFAS concentrations in groundwater increased temporally, ranging from approximately 10,000 ng/L at day 1 to 36,000 ng/L at day 21. Relative compositions of PFAS functional groups in liver, kidney, and gonad shifted temporally from majority FASA to PFSA. By day 21, mean ΣPFAS concentrations in tissues displayed predominance in order of: liver > kidney > gonad. Generally, bioconcentration factors (BCFs) for perfluoroalkyl sulfonamides (FASA), perfluoroalkyl carboxylic acids (PFCA), and fluorotelomer sulfonates (FTS) increased with degree of fluorinated chain length, but this was not evident for perfluoroalkyl sulfonic acids (PFSA). Perfluorooctane sulfonamide displayed the highest mean BCF (7,700 L/kg) in day 21 kidney. Generally, mean BCFs for FASA were within or above bioaccumulative thresholds outlined by the U.S. Environmental Protection Agency's (US EPA) Toxic Substances Control Act (TSCA) criteria, "B".

Share

COinS
 
 

To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.