摘要
研究了天津冬季中心城区、工业区和滨海区大气中PM2.5及其水溶性无机离子和含碳组分的污染特征.结果表明,天津冬季PM2.5污染严重,平均质量浓度为223μg/m3,其中有机物、SO42-和元素碳是含量较高的3种组分,分别占PM2.5总质量的23.4%,13.1%,12.8%.PM2.5浓度及其化学组成空间分布较为均匀,但工业区受局部排放源的影响,含碳物质污染突出;SO42-、NO3-、Cl-、NH4+和K+约占离子总量的90%,阴、阳离子未达到平衡状态,酸性阴离子过剩;有机碳与元素碳的浓度比为1.4,低于国内其他城市;有机碳主要来自污染源的直接排放,二次有机碳的含量约为27%～37%;机动车尾气、燃煤是PM2.5的主要排放源,海盐粒子的贡献甚微.
The pollution characteristics of PM2.5 and its water-soluble inorganic ion and carbonaceous component in urban, industrial and coastal areas of Tianjin in winter were studied. The winter-time PM2.5 pollution was serious with an average concentration of 223μg/m^3. Organic matter, sulfate and elemental carbon were the most abundant species constituting about 23.4%, 13.1% and 12.8% of the total PM2.5 mass, respectively. The spatial distribution of PM2.5 concentration and its chemical components was relatively even, but pollution of carbonaceous matter was most serious in the industrial area due to local emission sources. SO4^2-、NO3^-、Cl^-、NH4^＋ and K^＋ accounted for about 90% of the total ions, cation and anion did not reach equilibrium with an excess of acidic anion. The concentration ratio of organic carbon and elemental carbon was 1.4, lower than any other domestic cities. Most of the measured organic carbon was from primary emission sources, and secondary organic carbon content was about 27%～37%. Vehicle exhaust and coal combustion were the major emission sources of PM2.5 in Tianjin and the sea salt particle contribution was little.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2008年第6期481-486,共6页
China Environmental Science
基金
国家自然科学基金资助项目(20677030)
天津市科技发展计划项目(06YFSYSF02900)
关键词
PM2.5
水溶性无机离子
有机碳
元素碳
天津
PM2.5
water-soluble inorganic ion
organic carbon
elemental carbon
Tianjin
