Graduate Project
 

Characterization and Biodegradation of Commercial Reference Material Capstone 1157

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https://ir.library.oregonstate.edu/concern/graduate_projects/tx31qs85t

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  • Capstone 1157 is a commercial reference material used in aqueous film forming foam (AFFF) applications and was manufactured by DuPont. The material’s purpose in this project was to be the sole carbon source to microbes in a biodegradation study in a microcosm environment. The goal of this project was to determine if biodegradation of the major fluorotelomer components of Capstone 1157 occurred under microcosm conditions. Before the study could be started however, the full characterization of Capstone 1157 for mass balance purposes, along with sorption studies to dismiss loss onto microcosm container walls, was completed before continuing to the biodegradation studies. This characterization consisted of identification of components via liquid chromatography mass spectrometry (LC-MS), gas chromatography mass spectrometry (GC-MS) and 19 fluorine NMR (19F NMR) with standards of Capstone 1157 at varying dilutions in methanol. Biodegradation of Capstone 1157 in cultured media was attempted with the aid of biologists at Texas A&M university who provided the cultured media mix and set-up of the microcosms. However, the media mix chosen for the biodegradation of Capstone 1157 did not effectively degrade most of the major components which included 6:2 fluorotelomer sulfonamidoalkyl betaine (6:2 FtSaB), 6:2 fluorotelomer sulfonamide amine (6:2 FtSaAm), and 6:2 fluorotelomer sulfonate (6:2 FtS). Only the degradation of 6:2 FtS was observed, with some of its precursor PFAS being observed in small amounts. Therefore, since two out of the three major components in Capstone 1157 did not degrade, the project and funding was concluded with negative results.
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