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中文摘要：
为了探讨西安市大气颗粒物在霾天气下水溶性离子的组分特征，2005年9月至2006年9月对西安大气TSP和PM2.5进行了观测研究．结果显示，西安大气TSP和PM2.5在霾天气的总水性离子质量浓度分别为135．0μg·m^-3和72．4μg·m^-1．分析的11种离子（Na^＋、NH4^＋、K^＋、M^＋、Ca^2＋、F^-、Cl^-、Br^-、NO2^-、NO3^-和SO4^2-）中SO4^2-、NO^-3 、NH^＋ 4是TSP和PM2.5的主要成分，霾天气时这3种离子占总水溶性离子的百分比明显高于正常天气．pH测定的结果显示，霾天气大气颗粒物均比正常天气偏酸性．对比了不同天气下的SOR（SO2转化率）和NOR（NO2转化率），发现霾天气SO2和NO，转化率高于正常天气，尤其是SO2在霾天气更易转化为SO^2- 4
英文摘要：
In order to compare the water-soluble chemical species in ambient aerosol particles between haze days and normal days, TSP and PM2.5 samples were collected from Sep. 2005 to Sep. 2006. The result showed that the mass concentration of total water soluble ions in TSP and PM25 during haze days were 135.0μg· m^-3 and 72.4 μg·m^- 3 , respectively. 11 water-soluble （Na^＋, NH4^＋, K^＋, Mg^2＋, Ca^2＋, F^-, Cl^-, Br^-, NO^- 2, NO3^- and SO4^2- ） were measured. The results showed that NH4^＋ , SO4^2- and NO3^- were major species both in haze and normal days, while the percentage of concentration of these three major ions in TSP and PM2.5 during haze days was higher than that in normal days. Measurements of pH values for aerosol particles dilute showed haze day samples was more acid than those in normal days. Calculating the oxidation ratio of sulfur （SOR） and nitrogen （NOR） in two kinds of weather conditions, it revealed that ratio of transformation of S02 and NOx in haze days were more higher than those in normal days, especially for SO2.
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