摘要
为了探讨不同大气污染过程下气溶胶中水溶性离子组分的差异,分析比较了2009年10月16～30日持续污染、2010年4月27～30日沙尘污染、2010年6月14日秸秆焚烧污染这3次污染过程中气溶胶(PM10、PM2.1和PM1.1)及主要水溶性离子(NH4+、Mg2+、Ca2+、Na+、K+、NO2-、F-、NO3-、Cl-、SO24-)质量浓度及其谱分布.结果发现,3次污染过程中气溶胶污染严重,PM2.1/PM10比值有明显区别,其中沙尘污染过程最低,平均值仅为0.27;秸秆焚烧过程最高,为0.7.持续污染过程中NO3-和SO24-浓度较高,总阴离子质量浓度占PM10、PM2.1和PM1.1的18.62%、32.92%和33.53%.沙尘污染过程使气溶胶中的不溶物增加,总水溶性离子组分减少,仅占PM10、PM2.1和PM1.1的13.36%、23.72%和28.54%,而Ca2+质量浓度高于其他时期,且主要分布在>1μm粒径段上.秸秆焚烧过程中各种水溶性无机离子质量浓度均高于其他时期,但在气溶胶中比例较低;示踪物K+明显高于其他过程.3次污染过程中NO3-、SO24-和NH4+质量浓度峰值均在0.43～0.65μm粒径段.
In order to compare aerosol water-soluble inorganic species in different air-pollution periods,samples of PM10,PM2.1,PM1.1 and the main water-soluble ions(NH+4,Mg2+,Ca2+,Na+,K+,NO-2,F-,NO-3,Cl-,SO2-4) were measured,which were from 3 air-pollution incidents(continued pollution in October 16-30 of 2009,sandstorm pollution in April 27-30 of 2010,and crop burning pollution in June 14 of 2010.The results show that aerosol pollution of 3 periods is serious.The lowest PM2.1/PM10 is only 0.27,which is from sandstorm pollution period,while the largest is 0.7 from crop burning pollution period.In continued pollution periods,NO-3 and SO2-4 are the dominant ions,and the total anions account for an average of 18.62%,32.92% and 33.53% of PM10,PM2.1 and PM1.1.Total water-soluble ions only account for 13.36%,23.72% and 28.54% of PM10,PM2.1 and PM1.1 due to the insoluble species is increased in sandstorm pollution period.The mass concentration of Ca2+ in sandstorm pollution period is higher than the other two pollution periods,and which is mainly in coarse particles with diameter larger than 1 μm.All the ten water-soluble ions are much higher in crop burning pollution especially K+ which is the tracer from crop burning.The peak mass concentrations of NO-3,SO2-4 and NH+4 are in 0.43-0.65 μm.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2012年第6期1944-1951,共8页
Environmental Science
基金
国家自然科学基金重点项目(41030962)
国家重点基础研究发展规划(973)项目(2009CB426313)
教育部博士点基金项目(20093228110003)
江苏省优势学科建设工程项目
关键词
气溶胶
水溶性无机离子
持续污染
沙尘污染
秸秆焚烧
aerosol
water-soluble inorganic ions
continued pollution
sandstorm pollution
crop burning
