沈阳市城区采暖期PM_(2.5)中水溶性离子的化学特征

Chemica Character of Water-Soluble Ions in PM_(2.5) in Shenyang City during Heating Season

2013年11月—2014年3月采暖期在沈阳市沈河区设置采样点采集环境空气中的PM2.5。利用离子色谱法测定PM2.5中水溶性无机离子,分析PM2.5中水溶性无机离子的组成和污染特征等。结果表明,沈阳市冬季采暖期PM2.5平均质量浓度为106μg/m3,PM2.5中总水溶性离子占PM2.5的比例为41.7%,含量较高的二次离子依次为SO2-4、NO-3、NH+4,三者均有较好的相关性,SO2-4以(NH4)2SO4形式存在,采暖期PM2.5偏酸性。

PM2.5 samples were collected in Shenhe distract Shenyang between Nov 2013 and Mar 2014. Inorganic ions were analyzed by ion chromatography so as to analyze the component,pollution character and so on. The average concentration of PM2.5 was 106 μg/m3. The total ions in PM2.5 occupied 41.7% ,and SO2- ,NO3- ,NH4＋ were the major ions. These three ions were of good correction, SO4/2- was mainly in the form of （NH4 ）2SO4. PM2.5 was acidic according to the ionic equilibrium analysis.