Size-resolved aerosol ionic composition and secondary formation at Mount Heng in South Central China

作     者：Xinfeng WANG Wenxing WANG Likun XUE Xiaomei GAO Wei NIE Yangchun YU Yang ZHOU Lingxiao YANG Qingzhu ZHANG Tao WANG 

作者机构：Environment Research Institute Shandong University Jinan 250100 China Department of Civil and Environmental Engineering Hong Kong Polytechnic University Hong Kong China 

出 版 物：《Frontiers of Environmental Science & Engineering》 (环境科学与工程前沿（英文）)

年 卷 期：2013年第7卷第6期

页      面：815-826页

核心收录：

学科分类：081703[工学-生物化工] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070602[理学-大气物理学与大气环境] 0706[理学-大气科学] 0836[工学-生物工程] 082203[工学-发酵工程] 0822[工学-轻工技术与工程] 

基　　金：supported by the National Key Basic Research Program of China the Niche Area Development Program of the Hong Kong Polytechnic University the Shandong Provincial Environmental Protection Bureau the Special Research for Public-Beneficial Environment Protection 

主　　题：aerosol water-soluble ions size distributions,secondary formation dust storm Mount Heng 

摘      要：To understand the size-resolved aerosol ionic composition and the factors influencing secondary aerosol formation in the upper boundary layer in South Central China, size-segregated aerosol samples were collected using a micro-orifice uniform deposit irnpactor （MOUDI） in spring 2009 at the summit of Mount Heng （1269 m asl）, followed by subsequent laboratory analyses of 13 inorganic and organic water-soluble ions. During non- dust-storm periods, the average PM1.8 concentration was 41.8 μg·m^-3, contributing to 55% of the PM10. Sulfates, nitrates, and ammonium, the dominant ions in the fine particles, amounted to 46.8% of the PM1.8. Compared with Mount Tai in the North China Plain, the concentrations of both fine and coarse particles and the ions contained therein were substantially lower. When the air masses from Southeast Asia prevailed, intensive biomass burning there led to elevated concentrations of sulfates, nitrates, ammonium, potassium, and chloride in the fine particles at Mount Heng. The air masses originating from the north Gobi brought heavy dust storms that resulted in the remarkable production of sulfates, ammonium, methane sulfonic acid, and oxalates in the coarse particles. Generally, the sulfates were primarily produced in the form of （NH4）2SO4 in the droplet mode via heterogeneous aqueous reactions. Only approximately one-third of the nitrates were distributed in the fine mode, and high humidity facilitated the secondary formation of fine nitrates. The heterogeneous formation of coarse nitrates and ammonium on dry alkaline dust surfaces was found to be less efficient than that on the coarse particles during non-dust-storm periods.