深圳市郊区大气中PM2.5的特征分析

为了确定深圳市郊区大气中PM2.5的污染特征,本研究分析了2009年和2010年夏季和冬季PM2.5样品中的水溶性离子和多环芳烃成分.结果表明,深圳市郊区大气中PM2.5的质量浓度很高,夏季53.9%和冬季100%的样品超过了WHO的大气质量准则浓度.PM2.5中,冬季最主要的3种离子是SO24-、NO3-和NH4＋.在夏季,这3种离子在PM2.5中的含量都会减少,而Cl-、Na＋、K＋、Ca2＋和Mg2＋的含量会增多.另外,冬季是多环芳烃浓度较高的季节,其中萘、苊烯、苊和苯并荧蒽是冬季PM2.5中多环芳烃的主要成分.本研究还通过比值法和特征化合物法对深圳市郊区大气中的PM2.5进行了源解析,确定了PM2.5的可能来源.

Characterization of Atmospheric PM2.5 in the Suburb of Shenzhen

In this study, PM_2.5 samples had been measured from the summer of 2009 to the winter of 2010 in a suburb of Shenzhen. The results indicated serious PM_2.5 pollution in the suburb of Shenzhen. Seasonal and daily variations of water-soluble ions were discussed. SO₄^2-, NO₃^- and NH₄⁺ were the most abundant ions in winter. In summer, the average contributions of Cl^-, Na⁺, K⁺, Ca²⁺ and Mg²⁺ increased significantly, while SO₄^2-, NO₃^- and NH₄⁺ decreased. Furthermore, Naphthalene, acenaphthylene, acenaphthene and benzo fluoranthene were the major PAHs in PM_2.5. Ratio analysis and characteristic compounds analysis were also used to determine the possible sources of PM_2.5 in the suburb of Shenzhen.