Evaluation of perfluorinated compounds in sediment, water, and passive samplers collected from the Barksdale Air Force Base

dc.contributor.committeeChairAnderson, Todd A.
dc.contributor.committeeMemberSalice, Christopher J.
dc.contributor.committeeMemberJackson, W. Andrew
dc.creatorCochran, Rebecca S.
dc.description.abstractPerfluorinated compounds (PFCs) are environmentally persistent surfactants that consist of fully fluorinated carbon chains and a terminal sulfonate or carboxylate polar head moiety. Due to their unique amphiphilic properties, PFCs are used in the manufacturing of products such as aqueous film forming foams (AFFFs). There is cause for concern of PFC contamination near the Barksdale Air Force Base resulting from runoff and ground infiltration of AFFFs that were used during fire training. This study analyzed water and sediment samples that were collected over a 13-month sampling period from bayous upstream and downstream of two fire training areas located on the base to determine the occurrence and magnitude of PFCs. Liquid chromatography coupled with an electrospray ionization-triple stage quadrupole mass spectrometer was used for analysis of 6 different PFCs in sample extractions. Total PFC concentrations in the water and sediment samples ranged from non-detect to 7.1 ng/mL and non-detect to 31.4 ng/g, respectively. Two PFCs of increasing concern, perfluorooctanesulfonic acid and perfluorooctanoic acid, were quantified in 79% and 64% of water samples, respectively. Generally, PFCs containing a sulfonate polar head moiety were quantified more frequently than PFCs containing a carboxylate moiety. The perfluoroalkyl chain length of PFCs also showed significant influence on the PFC concentrations when analyzed using Spearman’s rank correlation analysis. A matrix of Spearman's rank correlation coefficients revealed that several water quality parameters (e.g., temperature, dissolved oxygen, ammonium, conductivity) may have a significant relationship with concentration of PFCs in water while parameters such as pH and organic matter content of sediment appeared to have no correlation with PFC concentrations. Concentrations of PFCs detected in water, sediment, and fish samples were then compared to sediment and water column passive sampler data to determine if passive samplers could be used as a less invasive method for estimating PFC concentrations in the environment. The concentrations detected in sediment passive samplers were estimated to be more heavily influenced by the amount of PFCs partitioning to the aqueous phase rather than the amount partitioning to sediment. Perfluorooctanesulfonic acid was the only PFC quantified in 1 water passive sampler. The PFCs that were qualitatively detected in water column passive samplers appeared to be related to PFCs that were detected in fish samples. However, results of both types of passive samplers may be improved by longer deployment in the environment.
dc.rights.availabilityAccess is not restricted.
dc.subjectPerfluorinated Compounds
dc.subjectPassive Samplers
dc.subjectAqueous Film Forming Foams
dc.titleEvaluation of perfluorinated compounds in sediment, water, and passive samplers collected from the Barksdale Air Force Base
thesis.degree.departmentEnvironmental Toxicology
thesis.degree.disciplineEnvironmental Toxicology
thesis.degree.grantorTexas Tech University
thesis.degree.nameMaster of Science


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