摘要
利用在线离子色谱获取2018年苏州工业园区PM2.5中水溶性离子组分小时浓度数据,分析PM2.5中水溶性离子组分特征。结果表明,PM2.5中水溶性离子组分浓度从高到低的排序依次为NO3->SO42->NH4+>Cl->Ca2+>K+>Na+>Mg2+。水溶性离子组分浓度占PM2.5的比例在夏季较高,冬季相对较低。从NO3-/SO42-比值看,秋冬季机动车尾气对颗粒物浓度的贡献占比增加。硝酸盐受光化学反应的影响变化幅度最大,其在夏季浓度较低,冬季浓度较高。苏州工业园区SOR年均值为0.314,NOR年均值为0.177,全年夜间SOR和NOR值均高于白天。在夏季和秋季受光化学反应的影响,NOR值可能被高估。4月份和5月份受沙尘和扬尘等污染的影响较大,在麦收季节和秋冬季受生物质燃烧等的影响较大。
The characteristics of water-soluble ions in PM2.5 of Suzhou Industrial Park during 2018 were analyzed,the data of water-soluble ions was measured by on-line ion chromatography. The results showed that the concentration of water-soluble ions in PM2.5 was NO3->SO42->NH4+>Cl->Ca2+>K+>Na+>Mg2+.The proportion of watersoluble ions in PM2.5 higher in summer and lower in winter. The NO3-/SO42-ratio implied that the contribution of mobile sources to particulate matter increased in autumn and winter. The concentration of nitrate was lower in summer and higher in winter,which was the most affected by photochemistry. The annual average of SOR and NOR was0.314 and 0.177 in Suzhou Industrial Park. The annual average values of SOR and NOR was higher in night than those in daytime. The values of NOR may be overestimated due to photochemistry reactions in summer and autumn.In addition,the impact of sand-dust and fugitive dust pollution was greater in April and May. The biomass combustion had greater influence on air quality in wheat harvest season or in autumn and winter.
作者
钱文杰
Qian Wenjie(Environmental Monitoring Station of Industrial Park in Suzhou,Suzhou 215021,China)
出处
《安徽农学通报》
2019年第22期120-122,共3页
Anhui Agricultural Science Bulletin
关键词
PM2.5
水溶性离子
二次组分
季节特征
PM2.5
Water-soluble ions
Secondary components
Seasonal characteristics
