Degradation of fluorotelomer alcohols: A likely atmospheric source of perfluorinated carboxylic acids
Degradation of fluorotelomer alcohols: A likely atmospheric source of perfluorinated carboxylic acids
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DOI：
10.1021/es049860w
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发表时间：
2004-06-15
影响因子：
11.4
通讯作者：
Wallington, TJ
中科院分区：
文献类型：
--
作者：
Ellis, DA;Martin, JW;Wallington, TJ
在全球城市和偏远地区收集的人类和动物组织含有持久性和生物蓄积性全氟羧酸（PFCAs）。pfca的来源以前是未知的。在这里，我们提出的烟雾室研究表明，氟端聚体醇（FTOHs）可以在大气中降解，产生一系列同源的PFCAs。大气中FTOHs的降解可能导致PFCAs的广泛传播。在考虑了它们的生物蓄积潜力之后，从FTOHs中产生的PFCAs的模式可以解释在北极动物中观察到的PFCAs的独特污染特征。此外，北极熊肝脏显示主要含有全氟壬烷酸（PFNA）的线性异构体（约99%），而全氟辛酸的分支异构体和线性异构体均被观察到，这强烈表明全氟壬烷酸的唯一输入来自基于“端粒”的产品。产生PFCAs的气相过氧自由基交叉反应的重要性以前没有被认识到。在所有多氟化材料的大气降解过程中，预计会发生这种反应，因此有必要重新审查这类重要工业化学品的环境命运和影响。
Human and animal tissues collected in urban and remote global locations contain persistent and bioaccumulative perfluorinated carboxylic acids (PFCAs). The source of PFCAs was previously unknown. Here we present smog chamber studies that indicate fluorotelomer alcohols (FTOHs) can degrade in the atmosphere to yield a homologous series of PFCAs. Atmospheric degradation of FTOHs is likely to contribute to the widespread dissemination of PFCAs. After their bioaccumulation potential is accounted for, the pattern of PFCAs yielded from FTOHs could account for the distinct contamination profile of PFCAs observed in arctic animals. Furthermore, polar bear liver was shown to contain predominately linear isomers (>99%) of perfluorononanoic acid (PFNA), while both branched and linear isomers were observed for perfluorooctanoic acid, strongly suggesting a sole input of PFNA from "telomer"-based products. The significance of the gas-phase peroxy radical cross reactions that produce PFCAs has not been recognized previously. Such reactions are expected to occur during the atmospheric degradation of all polyfluorinated materials, necessitating a reexamination of the environmental fate and impact of this important class of industrial chemicals.