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Citation
Tags
HERO ID
1311549
Reference Type
Journal Article
Title
Aerobic soil biodegradation of 8:2 fluorotelomer stearate monoester
Author(s)
Dasu, K; Liu, J; Lee, LS
Year
2012
Is Peer Reviewed?
1
Journal
Environmental Science & Technology
ISSN:
0013-936X
EISSN:
1520-5851
Volume
46
Issue
7
Page Numbers
3831-3836
Language
English
PMID
22372635
DOI
10.1021/es203978g
Web of Science Id
WOS:000302850400032
Abstract
A laboratory investigation on the biotransformation of 8:2 fluorotelomer stearate monoester (8:2 FTS) in aerobic soils was conducted by monitoring the loss of 8:2 FTS, production of 8:2 fluorotelomer alcohol (8:2 FTOH) and stearic acid, which would be released by cleavage of the ester linkage, and subsequent degradation products from FTOH for 80 d. Soil microcosms were extracted with ethyl acetate followed by two heated 90/10 v/v acetonitrile/200 mM NaOH extractions. 8:2 FTS was degraded with an observed half-life (t(1/2)) of 10.3 d. The rate of 8:2 FTS biotransformation substantially decreased after 20 d with 22% of 8:2 FTS still remaining on day 80. No biotransformation of 8:2 FTS occurred in autoclaved soil controls, which remained sterile with 102 ± 6% recovery, through day 20. 8:2 FTOH was generated with cleavage of the ester linkage of 8:2 FTS followed by a rapid decline (t(1/2) ~ 2 d) due to subsequent biodegradation. All the expected 8:2 FTOH degradation products were detected including 8:2 fluorotelomer unsaturated and saturated carboxylic acids, 7:2s FTOH, 7:3 acid, and three perfluoroalkyl carboxylic acids with the most prominent being perfluorooctanoic acid (PFOA). PFOA consistently increased over time reaching 1.7 ± 0.07 mol % by day 80. Although cleavage of the ester linkage was evidenced by 8:2 FTOH production, an associated trend in stearic acid concentrations was not clear because of complex fatty acid metabolism dynamics in soil. Further analysis of mass spectrometry fragmentation patterns and chromatography supported the conclusion that hydrolysis of the ester linkage is predominantly the first step in the degradation of 8:2 FTS with the ultimate formation of terminal products such as PFOA.
Keywords
Environmental Studies; Metabolism; Biodegradation; Fatty acids; Soil microorganisms; Mass spectrometry
Tags
OPPT
•
Fatty Alcohols
Literature Search
Environmental Hazard
Proquest (private)
•
Additional PFAS (formerly XAgency)
•
Expanded PFAS SEM (formerly PFAS 430)
Litsearch: September 2019
PubMed
Web of Science
Not prioritized for screening
8:2 Fluorotelomer sulfonic acid
3:2 Fluorotelomer alcohol
Ethyl perfluorooctanoate
•
FtOH 8:2
Literature Search
Pubmed
WOS
Screening Results
Excluded/Not on Topic
•
FtS 8:2
Literature Search
Pubmed
WOS
Screening Results
Excluded/Not on Topic
•
^Per- and Polyfluoroalkyl Substances (PFAS)
FtS 8:2 (39108-34-4)
Literature Search
Pubmed
WOS
FtS 6:2 (27619-97-2)
Literature Search
WOS
FtOH 8:2 (678-39-7)
Literature Search
Pubmed
WOS
•
PFAS 150
Literature Search Update December 2020
PubMed
WOS
Literature Search August 2019
PubMed
Web of Science
Not prioritized for screening
7:3 Fluorotelomer alcohol
8:2 Fluorotelomer alcohol
8:2 Fluorotelomer sulfonic acid
Ammonium perfluorooctanoate
Perfluorooctanoic acid
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