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首页> 外文期刊>Environmental Science & Technology >Airborne Trifluoroacetic Acid and Its Fraction from the Degradation of HFC-134a in Beijing, China
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Airborne Trifluoroacetic Acid and Its Fraction from the Degradation of HFC-134a in Beijing, China

机译：空气中的三氟乙酸及其在HFC-134a降解中的馏分

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摘要

Trifluoroacetic acid (TFA) has been attracting increasing attention worldwide because of its increased environmental concentrations and high aquatic toxicity. Atmospheric deposition is the major source of aquatic TFA, but only a few studies have reported either air concentrations or deposition fluxes for TFA. This is the first study to report the atmospheric concentrations of TFA in China, where an annular denuder and filter pack collection system were deployed at a highly urbanized site in Beijing. In total, 144 air samples were collected over the course of 1 year (from May 2012 to April 2013) and analyzed directly using high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) or following derivatization by gas chromatography-mass spectrometry (GC-MS). The annual mean atmospheric concentration of TFA was 1580 ± 558 pg/m~3, higher than the previously reported annual mean levels in Germany and Canada. For the first time, it was demonstrated that maximum concentrations of TFA were frequently observed in the afternoon, following a diurnal cycle and suggesting that a major source of airborne TFA is likely degradation of volatile precursors. Using a deposition model, the annual TFA deposition flux was estimated to be 619 ± 264 μg m~(-2) year~(-1). Nevertheless, a box model estimated that the TFA deposition flux from the degradation of HFC-134a contributed only 14％ (6-33％) to the total TFA deposition flux in Beijing. Source analysis is quite important for future TFA risk predictions; therefore, future research should focus on identifying additional sources.
机译：三氟乙酸（TFA）由于其环境浓度增加和高水生毒性而受到了越来越多的关注。大气沉积是水生TFA的主要来源，但是只有少数研究报告了TFA的空气浓度或沉积通量。这是第一个报告中国TFA大气浓度的研究，在北京一个高度城市化的地点部署了环形剥皮器和滤袋收集系统。在一年的时间里（从2012年5月到2013年4月），总共收集了144个空气样本，并直接使用高效液相色谱-串联质谱（HPLC-MS / MS）进行了分析，或者通过气相色谱-质谱法对其进行了衍生化处理。光谱分析（GC-MS）。 TFA的年平均大气浓度为1580±558 pg / m〜3，高于之前报道的德国和加拿大的年平均水平。首次证实，在昼夜周期之后，下午经常观察到最大浓度的TFA，这表明空中TFA的主要来源可能是挥发性前体的降解。使用沉积模型，年TFA沉积通量估计为619±264μgm〜（-2）年〜（-1）。然而，盒模型估计，HFC-134a降解产生的TFA沉积通量仅占北京总TFA沉积通量的14％（6-33％）。来源分析对于将来的TFA风险预测非常重要；因此，未来的研究应侧重于确定其他来源。

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  • 来源
    《Environmental Science & Technology》 |2014年第7期|3675-3681|共7页
  • 作者

    Jing Wu; Jonathan W. Martin; Zihan Zhai; Keding Lu; Li Li; Xuekun Fang; Hangbiao Jin; Jianxin Hu; Jianbo Zhang;

  • 作者单位

    State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, People's Republic of China,China Waterborne Transport Research Institute, Beijing 100088, People's Republic of China;

    Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, Alberta T6G 2B7, Canada;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, People's Republic of China;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, People's Republic of China;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, People's Republic of China;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, People's Republic of China;

    Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, Alberta T6G 2B7, Canada;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, People's Republic of China;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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