现场观测和量化气态与颗粒相大气甲醛分配。
Field observations and quantifications of atmospheric formaldehyde partitioning in gaseous and particulate phases.
机构信息
State Joint Key Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; School of Ecological Environment and Urban Construction, Fujian University of Technology, Fuzhou 350118, Fujian, China.
State Joint Key Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; International Joint Laboratory for Regional Pollution Control, Ministry of Education, Beijing 100816, China; Collaborative Innovation Centre of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science & Technology, Nanjing 210044, China.
出版信息
Sci Total Environ. 2022 Feb 20;808:152122. doi: 10.1016/j.scitotenv.2021.152122. Epub 2021 Dec 3.
Formaldehyde (HCHO) can possibly be taken by atmospheric particles due to its moderate solubility. Although previous model studies have proposed that uptake by particles was a large sink for HCHO, direct observation of HCHO partitioning and estimation of HCHO uptake coefficient (γ) for tropospheric conditions are still limited. In this work, online measurements of gaseous HCHO (HCHO) and particulate HCHO (HCHO) were carried out simultaneously at an urban site in Beijing in winter and spring. The results indicated that the average concentrations of HCHO ranged from 0.15 to 0.4 μg m, accounting for 1.2% to 10% of the total HCHO (i.e., HCHO + HCHO). The median values of estimated γ based on the measured data were in the range of about 1.09 ∗ 10-2.42 ∗ 10, with lower values during PM pollution episodes. Besides, the pH and liquid water content of aerosols that are mainly determined by ambient relative humidity (RH) and inorganic salt composition were identified as the main influencing factors of γ. We propose that the HCHO uptake process was mainly driven by hydrone and hydrogen ions in particles.
甲醛（HCHO）由于其中等的溶解度，可能会被大气颗粒物吸收。虽然之前的模型研究已经提出，颗粒物的吸收是 HCHO 的一个主要汇，但是对于对流层条件下 HCHO 的分配和吸收系数（γ）的直接观测仍然有限。在这项工作中，在北京的一个城市站点冬季和春季同时进行了气态甲醛（HCHO）和颗粒态甲醛（HCHO）的在线测量。结果表明，HCHO 的平均浓度范围为 0.15 到 0.4 μg m，占总 HCHO（即 HCHO+HCHO）的 1.2%到 10%。根据测量数据估计的γ的中值范围约为 1.09×10-2.42×10，在 PM 污染事件期间较低。此外，主要由环境相对湿度（RH）和无机盐组成决定的气溶胶的 pH 值和液水含量被确定为影响γ的主要因素。我们提出，HCHO 的吸收过程主要由颗粒中的水合氢离子和氢离子驱动。
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