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Citation
Tags
HERO ID
3859258
Reference Type
Journal Article
Title
Aerobic biodegradation of toluene-2,4-di(8:2 fluorotelomer urethane) and hexamethylene-1,6-di(8:2 fluorotelomer urethane) monomers in soils
Author(s)
Dasu, K; Lee, LS
Year
2016
Is Peer Reviewed?
Yes
Journal
Chemosphere
ISSN:
0045-6535
EISSN:
1879-1298
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Location
OXFORD
Volume
144
Page Numbers
2482-2488
Language
English
PMID
26624955
DOI
10.1016/j.chemosphere.2015.11.021
Web of Science Id
WOS:000367774400314
Abstract
Aerobic soil biodegradation of toluene-2,4-di(8:2 fluorotelomer urethane) (FTU) and hexamethylene-1,6-di(8:2 fluorotelomer urethane) (HMU) in a forest soil and FTU in an agricultural silty clay loam soil was monitored for up to 6 months. Fluorotelomer alcohols were measured in headspace and parent monomers and all metabolites in soil extracts. Negligible degradation of FTU biodegradation occurred in the agricultural soil with 94 ± 15% recovered at day 180. However, in the forest soil, both FTU and HMU degradation was evident with significant losses of 24% (117 d) and 27% (180 day), respectively, and concomitant increases in the terminal metabolite, perfluorooctanoic acid (PFOA) concentrations were well above what could result from residual 8:2 FTOH. Kinetic modeling estimated half-lives for FTU (aromatic backbone) and HMU (aliphatic backbone) in the forest soil to be 3-5 months and 15.9-22.2 months, respectively. The addition of a structurally similar non-fluorinated FTU analog, toluene-2,4-dicarbamic acid diethyl ester (TDAEE) enhanced production of terminal end products from 8:2 FTOH degradation. However, there was no clear evidence that TDAEE enhanced cleavage of the urethane bond, thus TDAEE appeared to just serve as an additional carbon source. TDAEE's half-life was ∼ one week. A second addition of TDAEE appeared to retard subsequent degradation of FTU exemplifying the microbial dynamics and diversity impacting degradation of polyfluoroalkyl substances. Enhanced degradation of HMU was observed upon re-aeration indicating oxygen may have been limiting during some periods although degradation of intermediate metabolites to terminal metabolites was still occurring, albeit at slower rates.
Keywords
PFOA; Perfluoroalkyl substances; Fluorotelomer urethane monomers; Urethane cleavage; Biotransformation
Tags
•
Additional PFAS (formerly XAgency)
•
Expanded PFAS SEM (formerly PFAS 430)
Litsearch: September 2019
PubMed
Not prioritized for screening
3:2 Fluorotelomer alcohol
•
FtOH 8:2
Literature Search
Pubmed
WOS
Screening Results
Excluded/Not on Topic
•
^Per- and Polyfluoroalkyl Substances (PFAS)
PFOA (335-67-1) and PFOS (1763-23-1)
Literature Search – Adverse outcome pathway (2015-present)
Pubmed
WOS
FtOH 8:2 (678-39-7)
Literature Search
Pubmed
WOS
•
PFAS 150
Literature Search August 2019
PubMed
Web of Science
Not prioritized for screening
8:2 Fluorotelomer alcohol
Ammonium perfluorooctanoate
Perfluorooctanoic acid
•
PFOA (335-67-1) and PFOS (1763-23-1)
Literature Search – Adverse outcome pathway (2015-present)
Pubmed
WOS
Screening Results
Excluded/Not on Topic
Literature Search Update (2013-2019)
PubMed
WOS
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