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Increases in Trifluoroacetate Concentrations in Surface Waters over Two Decades
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2022-06-23 , DOI: 10.1021/acs.est.2c01826 Thomas M Cahill 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2022-06-23 , DOI: 10.1021/acs.est.2c01826 Thomas M Cahill 1
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Trifluoroacetate (TFA) is a persistent perfluorinated alkanoic acid anion that has many anthropogenic sources, with fluorocarbon refrigerants being a major one. After an initial burst of research in the late 1990s and early 2000s, research on this ubiquitous pollutant declined as atmospheric emissions of the precursor compounds grew rapidly. Thus, there is little contemporaneous information about the concentrations of TFA in the environment and how they have changed over time. This research determined the change in TFA concentrations in streams by resampling a transect that was originally sampled in 1998. The transect was designed to determine the regional distribution of TFA both upwind and downwind of major metropolitan areas in Northern California as well as a set of globally remote sites in Alaska. The results showed that TFA concentrations increased by an average of 6-fold over the intervening 23 years, which resulted in a median concentration of 180 ng/L (range 21.3–2790). The highest concentrations were found in streams immediately downwind of the San Francisco Bay Area, while substantially lower concentrations were found in the upwind, regionally remote, and globally remote sites. The C3 to C5 perfluorinated alkanoic acids were also investigated, but they were rarely detected with this methodology.
中文翻译：
二十年来地表水中三氟乙酸盐浓度的增加
三氟乙酸盐 (TFA) 是一种持久性全氟链烷酸阴离子，有多种人为来源，其中氟碳制冷剂是主要来源。经过 20 世纪 90 年代末和 2000 年代初的初步研究爆发后，随着前体化合物的大气排放量迅速增加，对这种普遍存在的污染物的研究逐渐减少。因此，关于环境中 TFA 浓度及其随时间变化的同期信息很少。这项研究通过对 1998 年最初采样的样线进行重新采样，确定了溪流中 TFA 浓度的变化。该样线旨在确定北加州主要大都市区以及全球一组的 TFA 上风向和顺风向的区域分布。阿拉斯加的偏远地点。结果显示，TFA 浓度在 23 年间平均增加了 6 倍，中位浓度为 180 ng/L（范围 21.3-2790）。旧金山湾区紧邻下风向的溪流中浓度最高，而在上风向、区域偏远和全球偏远地点的浓度则低得多。还研究了C 3至C 5全氟化链烷酸，但用该方法很少检测到它们。
更新日期：2022-06-23
中文翻译：
二十年来地表水中三氟乙酸盐浓度的增加
三氟乙酸盐 (TFA) 是一种持久性全氟链烷酸阴离子，有多种人为来源，其中氟碳制冷剂是主要来源。经过 20 世纪 90 年代末和 2000 年代初的初步研究爆发后，随着前体化合物的大气排放量迅速增加，对这种普遍存在的污染物的研究逐渐减少。因此，关于环境中 TFA 浓度及其随时间变化的同期信息很少。这项研究通过对 1998 年最初采样的样线进行重新采样，确定了溪流中 TFA 浓度的变化。该样线旨在确定北加州主要大都市区以及全球一组的 TFA 上风向和顺风向的区域分布。阿拉斯加的偏远地点。结果显示，TFA 浓度在 23 年间平均增加了 6 倍，中位浓度为 180 ng/L（范围 21.3-2790）。旧金山湾区紧邻下风向的溪流中浓度最高，而在上风向、区域偏远和全球偏远地点的浓度则低得多。还研究了C 3至C 5全氟化链烷酸，但用该方法很少检测到它们。
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