2013 年至 2016 年北京地区气相和颗粒物中三氟乙酸的分布。
Distribution of trifluoroacetic acid in gas and particulate phases in Beijing from 2013 to 2016.
机构信息
State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, PR China.
State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, PR China; Land Consolidation and Rehabilitation Center, the Ministry of Land and Resources, Beijing 100035, PR China.
出版信息
Sci Total Environ. 2018 Sep 1;634:471-477. doi: 10.1016/j.scitotenv.2018.03.384. Epub 2018 Apr 6.
Trifluoroacetic acid (TFA) was measured at an urban site in Beijing from April 2013 to April 2016 and examined its characteristics and particle/gas distributions. The average monthly atmospheric TFA concentration fluctuated significantly and presented marked seasonal variations. The concentration levels of gas-phase TFA were significantly higher in spring and summer than in fall and winter. The PM mass concentration and ambient temperature were important factors affecting the concentration of particulate-phase TFA. Hence, at higher PM concentrations and lower temperatures, atmospheric TFA tended to be enriched in particulate matter. Our findings suggest that the percentage of gas-phase TFA in Beijing is higher than that in the steady state; thus, gas-phase TFA can still be transformed to the particulate phase and increase the contribution of TFA to haze formation.
三氟乙酸（TFA）于 2013 年 4 月至 2016 年 4 月在北京的一个城区站点进行了测量，并对其特征和颗粒/气体分布进行了考察。大气 TFA 的平均月浓度波动较大，呈现出明显的季节性变化。气态 TFA 的浓度水平在春季和夏季明显高于秋季和冬季。PM 质量浓度和环境温度是影响颗粒相 TFA 浓度的重要因素。因此，在较高的 PM 浓度和较低的温度下，大气 TFA 更倾向于富集在颗粒物中。我们的研究结果表明，北京地区气相 TFA 的比例高于稳定态，因此气相 TFA 仍可向颗粒相转化，增加 TFA 对霾形成的贡献。
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