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Fast Generation of Perfluoroalkyl Acids from Polyfluoroalkyl Amine Oxides in Aerobic Soils
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2020-08-14 , DOI: 10.1021/acs.estlett.0c00543
Hao Chen 1, 2 , Min Liu 2 , Gabriel Munoz 3 , Sung Vo Duy 3 , Sébastien Sauvé 3 , Yiming Yao 1 , Hongwen Sun 1 , Jinxia Liu 2
Affiliation  

Studies of the environmental fate of polyfluoroalkyl substances have revealed a broad range of precursor degradability and yields of perfluoroalkyl acids (PFAAs). For those electrochemical fluorination-derived zwitterionic fluorosurfactants present in aqueous film-forming foams (AFFFs), environmental persistence and potential contributions to perfluorooctanesulfonate (PFOS) and carboxylate (PFOA) are significant knowledge gaps. Here, we demonstrate that perfluorooctane-amido and -sulfonamido amine oxides (PFOANO and PFOSNO) can rapidly degrade in aerobic surface soils to produce PFOA and PFOS, respectively. When incubated in soil microcosms for 90 days, the two chemicals exhibited low stability with DT50 values (disappearance time for a 50% decline) of 3–7 days for PFOANO and ∼15 days for PFOSNO. PFOANO degraded to PFOA at a yield of 15–21 mol %, and PFOSNO produced PFOS at a yield of ∼2 mol %. The two chemicals unexpectedly underwent extensive abiotic transformations, generating products similar to those in biotic processes except for PFOA and PFOS. This study suggested for the first time that polyfluoroalkyl amine oxides could represent important sources to PFAAs, and their low environmental stability may explain their sporadic environmental occurrence at historical AFFF-impacted sites.

中文翻译:

在好氧土壤中由多氟烷基胺氧化物快速生成全氟烷基酸

对多氟烷基物质的环境命运的研究表明,前驱物的降解性和全氟烷基酸(PFAAs)的产率范围很广。对于存在于水性成膜泡沫(AFFF)中的那些电化学氟化衍生的两性离子含氟表面活性剂,环境持久性以及对全氟辛烷磺酸盐(PFOS)和羧酸盐(PFOA)的潜在贡献是明显的知识空白。在这里,我们证明全氟辛烷酰氨基和-磺酰氨基氧化胺(PFOANO和PFOSNO)可以在需氧表面土壤中快速降解,分别产生PFOA和PFOS。在土壤微观环境中孵育90天时,两种化学物质在DT 50的作用下显示出较低的稳定性PFOANO的值(消失时间为50%的消失时间)为3-7天,PFOSNO的值为约15天。PFOANO以15–21 mol%的产率降解为PFOA,PFOSNO以约2 mol%的产率生产PFOS。两种化学药品出乎意料地经历了广泛的非生物转化,除PFOA和PFOS外,产生的产物与生物过程相似。这项研究首次表明,多氟烷基氧化胺可能是PFAA的重要来源,其低的环境稳定性可能解释了它们在历史上受AFFF影响的地点的零星环境发生。
更新日期:2020-10-13
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