Biotransformation of 8:2 Fluorotelomer Alcohol in Soil from Aqueous Film-Forming Foams (AFFFs)-lmpacted Sites under Nitrate-, Sulfate-, and Iron-Reducing Conditions

Peng-Fei Yan; Sheng Dong; Katherine E. Manz

首页> 外文期刊>Environmental Science & Technology: ES&T >Biotransformation of 8:2 Fluorotelomer Alcohol in Soil from Aqueous Film-Forming Foams (AFFFs)-lmpacted Sites under Nitrate-, Sulfate-, and Iron-Reducing Conditions

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Biotransformation of 8:2 Fluorotelomer Alcohol in Soil from Aqueous Film-Forming Foams (AFFFs)-lmpacted Sites under Nitrate-, Sulfate-, and Iron-Reducing Conditions

机译：Biotransformation of 8:2 Fluorotelomer Alcohol in Soil from Aqueous Film-Forming Foams (AFFFs)-lmpacted Sites under Nitrate-, Sulfate-, and Iron-Reducing Conditions

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The environmental fate of per- and polyfluoroalkyl substances (PFAS) in aqueous film-forming foams (AFFFs) remains largely unknown, especially under the conditions representative of natural subsurface systems. In this study, the biotransformation of 8:2 fluorotelomer alcohol (8:2 FTOH), a component of new-generation AFFF formulations and a byproduct in fluorotelomer-based AFFFs, was investigated under nitrate-, iron-, and sulfate-reducing conditions in microcosms prepared with AFFF-impacted soils. Liquid chromatography-tandem mass spectrometry (LC-MS/MS) and high-resolution mass spectrometry (HRMS) were employed to identify biotransformation products. The biotransformation was much slower under sulfate-and iron-reducing conditions with >60 mol of initial 8:2 FTOH remaining after ～400 days compared to a half-life ranging from 12.5 to 36.5 days under nitrate-reducing conditions. Transformation products 8:2 fluorotelomer saturated and unsaturated carboxylic acids (8:2 FTCA and 8:2 FTUA) were detected under all redox conditions, while 7:2 secondary fluorotelomer alcohol (7:2 sFTOH) and perfluorooctanoic acid (PFOA) were only observed as transformation products under nitrate-reducing conditions. In addition, 1H-perfluoroheptane (F(CF2)6CF2H) and 3-F-7:3 acid (F(CF2)7CFHCH2COOH) were identified for the first time during 8:2 FTOH biotransformation. Comprehensive biotransformation pathways for 8:2 FTOH are presented, which highlight the importance of accounting for redox condition and the related microbial community in the assessment of PFAS transformations in natural environments.

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《Environmental Science & Technology: ES&T》 |2022年第19期|13728-13739|共12页
作者
Peng-Fei Yan; Sheng Dong; Katherine E. Manz;
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作者单位

Department of Civil and Environmental Engineering, Auburn University, Auburn, Alabama 36849, United States;

Department of Civil and Environmental Engineering Auburn University, Auburn, Alabama 36849, United States;

School of Engineering, Brown University, Providence, Rhode Island 02912, United States;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境科学、安全科学;
关键词
8:2 fluorotelomer alcohol; FTOH; AFFF; PFAS; redox condition; high-resolution mass spectrometry; biotransformation;

Biotransformation of 8:2 Fluorotelomer Alcohol in Soil from Aqueous Film-Forming Foams (AFFFs)-lmpacted Sites under Nitrate-, Sulfate-, and Iron-Reducing Conditions

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