Distribution of trifluoroacetic acid in gas and particulate phases in Beijing from 2013 to 2016

Zhang, Boya; Zhai, Zihan; Zhang, Jianbo

doi:10.1016/j.scitotenv.2018.03.384

Cited by 14 publications

(17 citation statements)

References 12 publications

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“…The seasonal variation in TFA concentration in precipitation observed in this study is in accordance with the marked seasonality of monthly mean gas-phase concentrations of TFA in Beijing, China, reported by Wu et al (sampling period: May 2012 – April 2013) and Zhang et al (sampling period: April 2013 – April 2016). In both studies, the concentration levels of gas-phase TFA were significantly higher in spring and summer than in fall and winter.…”

Section: Resultssupporting

confidence: 92%

“…The source of trifluoroacetate (TFA, Table S1; a list of abbreviations is provided in Table S2) in the environment has long been a topic of dispute: While results from ocean water sampling campaigns indicate that TFA is naturally occurring in ocean waters, albeit from unidentified sources, , the predominant quantity of TFA present in the atmosphere, , in precipitation, − freshwaters, , soils, , and terrestrial plants is more likely to originate from anthropogenic sources. For instance, TFA is known to be directly discharged into receiving waters by industrial facilities that produce and process trifluoroacetic acid .…”

Section: Introductionmentioning

confidence: 99%

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Trifluoroacetate in Precipitation: Deriving a Benchmark Data Set

Freeling

Behringer²,

Heydel³

et al. 2020

Environ. Sci. Technol.

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Although precipitation is considered to be the most important diffuse source of trifluoroacetate (TFA) to the nonmarine environment, information regarding the wet deposition of TFA as well as general data on the spatial and temporal variations in TFA concentration in precipitation is scarce. This is the first study to provide a comprehensive overview of the occurrence of TFA in precipitation by a systematic and nation-wide field monitoring campaign. In total, 1187 precipitation samples, which were collected over the course of 12 consecutive months at eight locations across Germany, were analyzed. The median, the estimated average, and the precipitation-weighted average TFA concentration of all analyzed wet deposition samples were 0.210, 0.703, and 0.335 μg/L, respectively. For Germany, an annual wet deposition flux of 190 μg/m 2 or approximately 68 t was calculated for the sampling period from February 2018 to January 2019. The campaign revealed a pronounced seasonality of the TFA concentration and wet deposition flux of collected samples. Correlation analysis suggested an enhanced transformation of TFA precursors in the troposphere in the summertime due to higher concentrations of photochemically generated oxidants such as hydroxyl radicals, ultimately leading to an enhanced atmospheric deposition of TFA during summer.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Trifluoroacetate in Precipitation: Deriving a Benchmark Data Set

Freeling

Behringer²,

Heydel³

et al. 2020

Environ. Sci. Technol.

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“…Higher concentrations of TFA has been observed in surface waters in industrialized areas compared with less industrialized areas [12]. Concentrations of TFA have also been reported in groundwater (< 5 ng/L to 7.5 μg/L) [9,11,12], ocean water (1-250 ng/L) [10,12,15,22], fog water (20 ng/L to 2.2 μg/L) [13,24,33], in municipal (90-600 ng/L) and industrial (< 100 ng/L to 206 μg/L) wastewater effluent [9], in air (10 ng/ L to 6.3 μg/L) [12,23,26], and in drinking water (16 ng/L to 11 μg/L) [9,11,16,27]. Moreover, TFA has been reported in soil (< 0.1-9.4 ng/L) and conifer needles (< 2-420 ng/L) [18].…”

Section: Reported Environmental Concentrationsmentioning

confidence: 99%

“…Increased attention was paid on TFA after the phaseout of chlorofluorocarbons (CFCs), according to the Montreal Protocol on substances that deplete the ozone layer in 1989 [8], and the subsequent introduction of hydrofluorocarbons (HFCs) and hydrochlorofluorocarbons (HCFCs). TFA has since then been widely studied and reported in various environmental matrices globally [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. Other ultra-short-chain PFAAs have not been well studied and data reporting their sources, fate, and environmental occurrence is scarce.…”

Section: Introductionmentioning

confidence: 99%

Challenges in the analytical determination of ultra-short-chain perfluoroalkyl acids and implications for environmental and human health

et al. 2020

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Ultra-short-chain perfluoroalkyl acids have recently gained attention due to increasing environmental concentrations being observed. The most well-known ultra-short-chain perfluoroalkyl acid is trifluoroacetic acid (TFA) which has been studied since the 1990s. Potential sources and the fate of ultra-short-chain perfluoroalkyl acids other than TFA are not well studied and data reporting their environmental occurrence is scarce. The analytical determination of ultra-short-chain perfluoroalkyl acids is challenging due to their high polarity resulting in low retention using reversed-phase liquid chromatography. Furthermore, recent studies have reported varying extraction recoveries in water samples depending on the water matrix and different methods have been suggested to increase the extraction recovery. The present review gives an overview of the currently used analytical methods and summarizes the findings regarding potential analytical challenges. In addition, the current state of knowledge regarding TFA and other ultra-short-chain perfluoroalkyl acids, namely perfluoropropanoic acid, trifluoromethane sulfonic acid, perfluoroethane sulfonic acid, and perfluoropropane sulfonic acid‚ are reviewed. Both known and potential sources as well as environmental concentrations are summarized and discussed together with their fate and the environmental and human implications.

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“…Here, the typical concentrations of catalysts X and the temperature range of 280-320 K in the atmosphere were considered. The concentration values [2,35,43,52,[54][55][56][57][58][59][60][61] of all catalysts were previously reported.…”

Section: Base Catalyzedmentioning

confidence: 99%

The catalytic effects of H₂O, basic and acidic catalysts on the gas‐phase hydrolysis mechanism of carbonyl fluoride (CF₂O)

Zhang

Lily

et al. 2021

Int J of Quantum Chemistry

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The carbonyl fluoride (CF 2 O) is one of the significant atmospheric molecules, and its hydrolysis reaction has been considered the most potential removal process in the earth's troposphere. In this article, the hydrolysis reaction of CF 2 O assisted by H 2 O, basic (NH 3 and CH 3 NHCH 3 ), and acidic (H 2 SO 4 , HCOOH, and CF 3 COOH) catalysts have theoretically investigated using quantum chemical methods. These catalysts significantly decrease the hydrolysis reaction of barrier height by 20.4-28.8 kcal mol −1 .Here two H-transfer mechanisms have been identified in these catalyzed hydrolytic reactions as asynchronous collaborative caused by base molecules and the synchronous collaborative led by H 2 O and acid molecules. In addition, the rate coefficient and relative rate of all catalytic reactions have calculated using conventional transition state theory (TST) over a temperature range of 280-320 K. The results show that H 2 SO 4 has the best catalytic effect without considering the concentration of catalyst molecules in the atmosphere. On the contrary, a high concentration of HCOOH (10 ppbv) is dominant in the catalytic reaction when considered the concentrations of catalyst molecules. In this work, it was identified that the catalytic efficiencies of H 2 O, acid and base molecules upon addition reaction between CF 2 O and H 2 O is not only related to their catalytic mechanisms but also depending upon their concentrations in the atmosphere.

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Distribution of trifluoroacetic acid in gas and particulate phases in Beijing from 2013 to 2016

Cited by 14 publications

References 12 publications

Trifluoroacetate in Precipitation: Deriving a Benchmark Data Set

Trifluoroacetate in Precipitation: Deriving a Benchmark Data Set

Challenges in the analytical determination of ultra-short-chain perfluoroalkyl acids and implications for environmental and human health

The catalytic effects of H₂O, basic and acidic catalysts on the gas‐phase hydrolysis mechanism of carbonyl fluoride (CF₂O)

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Distribution of trifluoroacetic acid in gas and particulate phases in Beijing from 2013 to 2016

Cited by 14 publications

References 12 publications

Trifluoroacetate in Precipitation: Deriving a Benchmark Data Set

Trifluoroacetate in Precipitation: Deriving a Benchmark Data Set

Challenges in the analytical determination of ultra-short-chain perfluoroalkyl acids and implications for environmental and human health

The catalytic effects of H2O, basic and acidic catalysts on the gas‐phase hydrolysis mechanism of carbonyl fluoride (CF2O)

Contact Info

Product

Resources

About

The catalytic effects of H₂O, basic and acidic catalysts on the gas‐phase hydrolysis mechanism of carbonyl fluoride (CF₂O)