Wang Xiao-yan, Wang Hui-xiang, Ma Yi-yuan
State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Science and Engineering, Peking University, Beijing 100871, China.
Huan Jing Ke Xue. 2010 Aug;31(8):1762-7.
Through 2,4-dinitrophenylhydrazine (DNPH) high-performance liquid chromatography (HPLC) method, the levels of formaldehyde in ambient air, rain and fog samples were measured in Mangdang Mountain, Fujian Province, from March to April 2009. The average concentrations of formaldehyde in ambient air, rain and fog are 4.0 x 10(-10), 2.19 micromol/L and 2.94 micromol/L, respectively. Based on previous researches, this study described formaldehyde hydrolysis and reacting with S(IV) and other chemical reaction processes in liquid phase, explaining the phenomenon that the solubility of formaldehyde in the liquid phase is higher than the theoretical value. On-site measured Henry coefficients (Hme) and the effective Henry coefficients (H*) were derived from concentration of formaldehyde in ambient air, rain and fog samples and references. Comparing Hme and H*, this study found that the measured liquid phase concentrations of formaldehyde are higher than the theoretical concentrations, consistent with the references. The further founding is that Hme/H* in fog is higher than in rain, proving the result of Mangdang Mountain that the concentration of formaldehyde in fog is higher than in rain. Considering the climatic characteristics of Mangdang Mountain in spring, the wet deposition of formaldehyde is an important way in this area.
通过2,4-二硝基苯肼（DNPH）高效液相色谱（HPLC）法，于2009年3月至4月对福建省芒荡山的环境空气、雨水和雾样品中的甲醛含量进行了测定。环境空气、雨水和雾中甲醛的平均浓度分别为4.0×10⁻¹⁰、2.19微摩尔/升和2.94微摩尔/升。基于以往的研究，本研究描述了甲醛在液相中的水解以及与S(IV)的反应和其他化学反应过程，解释了甲醛在液相中的溶解度高于理论值的现象。现场测量的亨利系数（Hme）和有效亨利系数（H*）由环境空气、雨水和雾样品以及参考文献中的甲醛浓度推导得出。通过比较Hme和H*，本研究发现所测甲醛的液相浓度高于理论浓度，与参考文献一致。进一步的发现是，雾中的Hme/H*高于雨水中的，证实了芒荡山雾中甲醛浓度高于雨水中的这一结果。考虑到芒荡山春季的气候特征，甲醛的湿沉降是该地区甲醛的一个重要去除途径。
