Aerobic Soil Biotransformation of 6:2 Fluorotelomer Iodide

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• 作者：Ting Ruan ; Bogdan Szostek ; Patrick W. Folsom ; Barry W. Wolstenholme ; Runzeng Liu ; Jiyan Liu ; Guibin Jiang ; Ning Wang ; Robert C. Buck
• 刊名：Environmental Science & Technology
• 出版年：2013
• 出版时间：October 15, 2013
• 年：2013
• 卷：47
• 期：20
• 页码：11504-11511
• 全文大小：372K
• 年卷期：v.47,no.20(October 15, 2013)
• ISSN：1520-5851

文摘

6:2 FTI [F(CF₂)₆CH₂CH₂I] is a principal industrial raw material used to manufacture 6:2 FTOH [F(CF₂)₆CH₂CH₂OH] and 6:2 FTOH-based products and could enter aerobic environments from possible industrial emissions where it is manufactured. This is the first study to assess 6:2 FTI aerobic soil biotransformation, quantify transformation products, and elucidate its biotransformation pathways. 6:2 FTI biotransformation led to 6:2 FTOH as a key intermediate, which was subsequently biotransformed to other significant transformation products, including PFPeA [F(CF₂)₄COOH, 20 mol % at day 91], 5:3 acid [F(CF₂)₅CH₂CH₂COOH, 16 mol %], PFHxA [F(CF₂)₅COOH, 3.8 mol %], and 4:3 acid [F(CF₂)₄CH₂CH₂COOH, 3.0 mol %]. 6:2 FTI biotransformation also led to a significant level of PFHpA [F(CF₂)₆COOH, 16 mol % at day 91], perhaps via another putative intermediate, 6:2 FTUI [F(CF₂)₆CH鈺怌HI], whose molecular identity and further biotransformation were not verified because of the lack of an authentic standard. Total recovery of the aforementioned per- and polyfluorocarboxylates accounted for 59 mol % of initially applied 6:2 FTI by day 91, in comparison to 56 mol % when soil was dosed with 6:2 FTOH, which did not lead to PFHpA. Thus, were 6:2 FTI to be released from its manufacture and undergo soil microbial biotransformation, it could form PFPeA, PFHpA, PFHxA, 5:3 acid, and 4:3 acid in the environment.