摘要
为了解长白山大气PM2.5中水溶性离子的季节变化特征及其影响因素，于2005年6月～2008年12月，在长白山北坡海拔763m处利用大流量滤膜采样器采集PM2.5样品，并用离子色谱分析其中的主要水溶性离子成分含量．结果表明，3种最主要的水溶性离子SO4^2-、NH4^＋和NO3^-季节变化趋势明显，SO4^2-夏季浓度最高，秋季浓度最低；NO3^-冬季浓度最高，夏季浓度最低；NH4的季节变化趋势主要受到SO4^2-和NO3^-季节变化趋势的影响．不同方向后向轨迹所对应的总水溶性离子浓度存在明显差异，浓度排序依次是NE〈NW〈SW，分别为5．43、7．63和10．26μg·m^-3．Ca^2＋测量值与CO3^2-计算值存在明显的相关性，春季最好，夏季最差，屁分别为0．74和0．30．
To study seasonal variation of water-soluble ions in PM2.5 at Changbai Mountain. PM2.5 was collected with a high-volume sampler from Jun. 2005 to Dee. 2008, and the concentrations of water-soluble ions were analyzed using ion chromatography. The results showed that the three major ions of SO42- , NH4 and NO3 showed obvious seasonal variation. The mass concentration of SO4^2- was the highest in summer and lowest in autumn. The mass concentration of NO3- was the highest in winter and lowest in summer. The seasonal variation of NH4 was influenced by SO42- and NO3-. The total concentrations of water-soluble ions in PM25 from different directions were evidently different, following the order of NE 〈 NW 〈 SW, with the average concentrations of 5.43, 7.63 and 10. 26 μg.m-3, respectively. Ca2＋ was strongly correlated with COl- , and the correlation（R） was higher in spring （0.74） than that in summer （0.30）.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2014年第1期9-14,共6页
Environmental Science
基金
中国科学院知识创新工程重要方向项目(KZCX2-YW-Q02-03)
中国科学院战略性先导科技专项(XDA05100100)
关键词
PM2
5
水溶性
离子
季节变化
长白山
PM2.5
water-soluble
ion
seasonal variation
Changbai Mountain
