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Degradability of an Acrylate-Linked, Fluorotelomer Polymer in Soil

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National Exposure Research Laboratory, USEPA, 960 College Station Road, Athens, Georgia 30605
* Corresponding author e-mail: [email protected]
†National Exposure Research Laboratory.
‡Senior Service America, Inc.
§National Research Council.
∥Student Services Authority.
Cite this: Environ. Sci. Technol. 2009, 43, 17, 6617–6623
Publication Date (Web):July 1, 2009
https://doi.org/10.1021/es9002668
Copyright © 2009 American Chemical Society
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    Abstract

    Fluorotelomer polymers are used in a broad array of products in modern societies worldwide and, if they degrade at significant rates, potentially are a significant source of perfluorooctanoic acid (PFOA) and related compounds to the environment. To evaluate this possibility, we incubated an acrylate-linked fluorotelomer polymer in soil microcosms and monitored the microcosms for possible fluorotelomer (FT) and perfluorinated-compound (PFC) degradation products using GC/MS and LC/MS/MS. This polymer scavenged FTs and PFCs aggressively necessitating development of a multistep extraction using two solvents. Aged microcosms accumulated more FTs and PFCs than were present in the fresh polymer indicating polymer degradation with a half-life of about 870−1400 years for our coarse-grained test polymer. Modeling indicates that more-finely grained polymers in soils might have half-lives of about 10−17 years assuming degradation is surface-mediated. In our polymer-soil microcosms, PFOA evidently was lost with a half-life as short as 130 days, possibly by polymer-catalyzed degradation. These results suggest that fluorotelomer-polymer degradation is a significant source of PFOA and other fluorinated compounds to the environment.

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    Text detailing study design, materials used, a supporting side experiment, extraction and procedures, assimilation of analytical results, statistical analyses, and modeling; exhaustive tables of analytical results. Supporting text is divided into sections by subject and referenced in this paper by relevant section. This information is available free of charge via the Internet at http://pubs.acs.org.

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